---
_id: '17615'
abstract:
- lang: eng
  text: Graham et al. have detected a 5.2 yr periodic optical variability of the quasar
    PG 1302-102 at redshift z = 0.3, which they interpret as the redshifted orbital
    period (1 + z)tbin of a putative supermassive black hole binary (SMBHB). Here,
    we consider the implications of a 3–8 times shorter orbital period, suggested
    by hydrodynamical simulations of circumbinary discs (CBDs) with nearly equal-mass
    SMBHBs (q ≡ M2/M1 ≳ 0.3). With the corresponding 2–4 times tighter binary separation,
    PG 1302 would be undergoing gravitational wave dominated inspiral, and serve as
    a proof that the BHs can be fuelled and produce bright emission even in this late
    stage of the merger. The expected fraction of binaries with the shorter tbin,
    among bright quasars, would be reduced by one to two orders of magnitude, compared
    to the 5.2 yr period, in better agreement with the rarity of candidates reported
    by Graham et al. Finally, shorter periods would imply higher binary speeds, possibly
    imprinting periodicity on the light curves from relativistic beaming, as well
    as measurable relativistic effects on the Fe K α line. The CBD model predicts
    additional periodic variability on time-scales of tbin and ≈0.5tbin, as well as
    periodic variation of broad line widths and offsets relative to the narrow lines,
    which are consistent with the observations. Future observations will be able to
    test these predictions and hence the binary+CBD hypothesis for PG 1302.
article_processing_charge: No
article_type: original
author:
- first_name: D. J.
  full_name: D'Orazio, D. J.
  last_name: D'Orazio
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
- first_name: P.
  full_name: Duffell, P.
  last_name: Duffell
- first_name: B. D.
  full_name: Farris, B. D.
  last_name: Farris
- first_name: A. I.
  full_name: MacFadyen, A. I.
  last_name: MacFadyen
citation:
  ama: D’Orazio DJ, Haiman Z, Duffell P, Farris BD, MacFadyen AI. A reduced orbital
    period for the supermassive black hole binary candidate in the quasar PG 1302-102?
    <i>Monthly Notices of the Royal Astronomical Society</i>. 2015;452(3):2540-2545.
    doi:<a href="https://doi.org/10.1093/mnras/stv1457">10.1093/mnras/stv1457</a>
  apa: D’Orazio, D. J., Haiman, Z., Duffell, P., Farris, B. D., &#38; MacFadyen, A.
    I. (2015). A reduced orbital period for the supermassive black hole binary candidate
    in the quasar PG 1302-102? <i>Monthly Notices of the Royal Astronomical Society</i>.
    Oxford University Press. <a href="https://doi.org/10.1093/mnras/stv1457">https://doi.org/10.1093/mnras/stv1457</a>
  chicago: D’Orazio, D. J., Zoltán Haiman, P. Duffell, B. D. Farris, and A. I. MacFadyen.
    “A Reduced Orbital Period for the Supermassive Black Hole Binary Candidate in
    the Quasar PG 1302-102?” <i>Monthly Notices of the Royal Astronomical Society</i>.
    Oxford University Press, 2015. <a href="https://doi.org/10.1093/mnras/stv1457">https://doi.org/10.1093/mnras/stv1457</a>.
  ieee: D. J. D’Orazio, Z. Haiman, P. Duffell, B. D. Farris, and A. I. MacFadyen,
    “A reduced orbital period for the supermassive black hole binary candidate in
    the quasar PG 1302-102?,” <i>Monthly Notices of the Royal Astronomical Society</i>,
    vol. 452, no. 3. Oxford University Press, pp. 2540–2545, 2015.
  ista: D’Orazio DJ, Haiman Z, Duffell P, Farris BD, MacFadyen AI. 2015. A reduced
    orbital period for the supermassive black hole binary candidate in the quasar
    PG 1302-102? Monthly Notices of the Royal Astronomical Society. 452(3), 2540–2545.
  mla: D’Orazio, D. J., et al. “A Reduced Orbital Period for the Supermassive Black
    Hole Binary Candidate in the Quasar PG 1302-102?” <i>Monthly Notices of the Royal
    Astronomical Society</i>, vol. 452, no. 3, Oxford University Press, 2015, pp.
    2540–45, doi:<a href="https://doi.org/10.1093/mnras/stv1457">10.1093/mnras/stv1457</a>.
  short: D.J. D’Orazio, Z. Haiman, P. Duffell, B.D. Farris, A.I. MacFadyen, Monthly
    Notices of the Royal Astronomical Society 452 (2015) 2540–2545.
date_created: 2024-09-05T13:31:30Z
date_published: 2015-07-24T00:00:00Z
date_updated: 2024-09-24T07:58:52Z
day: '24'
doi: 10.1093/mnras/stv1457
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/stv1457
intvolume: '       452'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1093/mnras/stv1457
month: '07'
oa: 1
oa_version: Published Version
page: 2540-2545
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 0035-8711
  - 1365-2966
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: A reduced orbital period for the supermassive black hole binary candidate in
  the quasar PG 1302-102?
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 452
year: '2015'
...
---
_id: '17641'
abstract:
- lang: eng
  text: 'In order to elucidate the origin of spin in both dark matter and baryons
    in galaxies, we have performed hydrodynamical simulations from cosmological initial
    conditions. We study atomic cooling haloes in the redshift range 100>z>9 with
    masses of order 109M⊙ at redshift z=10. We assume that the gas has primordial
    composition and that H2-cooling and prior star-formation in the haloes have been
    suppressed. We present a comprehensive analysis of the gas and dark matter properties
    of four halos with very low (λ≈0.01), low (λ≈0.04), high (λ≈0.06) and very high
    (λ≈0.1) spin parameter. Our main conclusion is that the spin orientation and magnitude
    is initially well described by tidal torque linear theory, but later on is determined
    by the merging and accretion history of each halo. We provide evidence that the
    topology of the merging region, i.e. the number of colliding filaments, gives
    an accurate prediction for the spin of dark matter and gas: halos at the center
    of knots will have low spin while those in the center of filaments will have high
    spin. The spin of a halo is given by λ≈0.05×(7.6/numberoffilaments)^5.1'
article_processing_charge: No
article_type: original
author:
- first_name: Joaquin
  full_name: Prieto, Joaquin
  last_name: Prieto
- first_name: Raul
  full_name: Jimenez, Raul
  last_name: Jimenez
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
- first_name: Roberto E.
  full_name: González, Roberto E.
  last_name: González
citation:
  ama: 'Prieto J, Jimenez R, Haiman Z, González RE. The origin of spin in galaxies:
    Clues from simulations of atomic cooling haloes. <i>Monthly Notices of the Royal
    Astronomical Society</i>. 2015;452(1):784-802. doi:<a href="https://doi.org/10.1093/mnras/stv1234">10.1093/mnras/stv1234</a>'
  apa: 'Prieto, J., Jimenez, R., Haiman, Z., &#38; González, R. E. (2015). The origin
    of spin in galaxies: Clues from simulations of atomic cooling haloes. <i>Monthly
    Notices of the Royal Astronomical Society</i>. Oxford University Press. <a href="https://doi.org/10.1093/mnras/stv1234">https://doi.org/10.1093/mnras/stv1234</a>'
  chicago: 'Prieto, Joaquin, Raul Jimenez, Zoltán Haiman, and Roberto E. González.
    “The Origin of Spin in Galaxies: Clues from Simulations of Atomic Cooling Haloes.”
    <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press,
    2015. <a href="https://doi.org/10.1093/mnras/stv1234">https://doi.org/10.1093/mnras/stv1234</a>.'
  ieee: 'J. Prieto, R. Jimenez, Z. Haiman, and R. E. González, “The origin of spin
    in galaxies: Clues from simulations of atomic cooling haloes,” <i>Monthly Notices
    of the Royal Astronomical Society</i>, vol. 452, no. 1. Oxford University Press,
    pp. 784–802, 2015.'
  ista: 'Prieto J, Jimenez R, Haiman Z, González RE. 2015. The origin of spin in galaxies:
    Clues from simulations of atomic cooling haloes. Monthly Notices of the Royal
    Astronomical Society. 452(1), 784–802.'
  mla: 'Prieto, Joaquin, et al. “The Origin of Spin in Galaxies: Clues from Simulations
    of Atomic Cooling Haloes.” <i>Monthly Notices of the Royal Astronomical Society</i>,
    vol. 452, no. 1, Oxford University Press, 2015, pp. 784–802, doi:<a href="https://doi.org/10.1093/mnras/stv1234">10.1093/mnras/stv1234</a>.'
  short: J. Prieto, R. Jimenez, Z. Haiman, R.E. González, Monthly Notices of the Royal
    Astronomical Society 452 (2015) 784–802.
date_created: 2024-09-06T07:18:53Z
date_published: 2015-07-08T00:00:00Z
date_updated: 2024-09-24T11:52:00Z
day: '08'
doi: 10.1093/mnras/stv1234
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/stv1234
intvolume: '       452'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1093/mnras/stv1234
month: '07'
oa: 1
oa_version: Published Version
page: 784-802
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 0035-8711
  - 1365-2966
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'The origin of spin in galaxies: Clues from simulations of atomic cooling haloes'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 452
year: '2015'
...
---
_id: '17663'
abstract:
- lang: eng
  text: Recently, Planck measured a value of the cosmic microwave background (CMB)
    optical depth due to electron scattering of τ=0.066±0.016. Here we show that this
    low value leaves essentially no room for an early partial reionisation of the
    intergalactic medium (IGM) by high-redshift Population III (Pop III) stars, expected
    to have formed in low-mass minihaloes. We perform semi-analytic calculations of
    reionisation which include the contribution from Pop II stars in atomic cooling
    haloes, calibrated with high-redshift galaxy observations, and Pop III stars in
    minihaloes with feedback due to Lyman-Werner (LW) radiation and metal enrichment.
    We find that without LW feedback or prompt metal enrichment (and assuming a minihalo
    escape fraction of 0.5) the Pop III star formation efficiency cannot exceed ∼a
    few×10−4, without violating the constraints set by Planck data. This excludes
    massive Pop III star formation in typical 106M⊙ minihaloes. Including LW feedback
    and metal enrichment alleviates this tension, allowing large Pop III stars to
    form early on before they are quenched by feedback. We find that the total density
    of Pop III stars formed across cosmic time is ≲104−5 M⊙ Mpc−3 and does not depend
    strongly on the feedback prescription adopted. Additionally, we perform a simple
    estimate of the possible impact on reionisation of X-rays produced by accretion
    onto black hole remnants of Pop III stars. We find that unless the accretion duty
    cycle is very low (≲0.01), this could lead to an optical depth inconsistent with
    Planck.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Eli
  full_name: Visbal, Eli
  last_name: Visbal
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
- first_name: Greg L.
  full_name: Bryan, Greg L.
  last_name: Bryan
citation:
  ama: Visbal E, Haiman Z, Bryan GL. Limits on population III star formation in minihaloes
    implied by Planck. <i>Monthly Notices of the Royal Astronomical Society</i>. 2015;453(4):4457-4467.
    doi:<a href="https://doi.org/10.1093/mnras/stv1941">10.1093/mnras/stv1941</a>
  apa: Visbal, E., Haiman, Z., &#38; Bryan, G. L. (2015). Limits on population III
    star formation in minihaloes implied by Planck. <i>Monthly Notices of the Royal
    Astronomical Society</i>. Oxford University Press. <a href="https://doi.org/10.1093/mnras/stv1941">https://doi.org/10.1093/mnras/stv1941</a>
  chicago: Visbal, Eli, Zoltán Haiman, and Greg L. Bryan. “Limits on Population III
    Star Formation in Minihaloes Implied by Planck.” <i>Monthly Notices of the Royal
    Astronomical Society</i>. Oxford University Press, 2015. <a href="https://doi.org/10.1093/mnras/stv1941">https://doi.org/10.1093/mnras/stv1941</a>.
  ieee: E. Visbal, Z. Haiman, and G. L. Bryan, “Limits on population III star formation
    in minihaloes implied by Planck,” <i>Monthly Notices of the Royal Astronomical
    Society</i>, vol. 453, no. 4. Oxford University Press, pp. 4457–4467, 2015.
  ista: Visbal E, Haiman Z, Bryan GL. 2015. Limits on population III star formation
    in minihaloes implied by Planck. Monthly Notices of the Royal Astronomical Society.
    453(4), 4457–4467.
  mla: Visbal, Eli, et al. “Limits on Population III Star Formation in Minihaloes
    Implied by Planck.” <i>Monthly Notices of the Royal Astronomical Society</i>,
    vol. 453, no. 4, Oxford University Press, 2015, pp. 4457–67, doi:<a href="https://doi.org/10.1093/mnras/stv1941">10.1093/mnras/stv1941</a>.
  short: E. Visbal, Z. Haiman, G.L. Bryan, Monthly Notices of the Royal Astronomical
    Society 453 (2015) 4457–4467.
date_created: 2024-09-06T07:40:38Z
date_published: 2015-09-16T00:00:00Z
date_updated: 2024-09-25T07:32:20Z
day: '16'
doi: 10.1093/mnras/stv1941
extern: '1'
external_id:
  arxiv:
  - '1505.06359'
fulldoi: https://doi.org/10.1093/mnras/stv1941
intvolume: '       453'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: ' https://doi.org/10.48550/arXiv.1505.06359'
month: '09'
oa: 1
oa_version: Preprint
page: 4457-4467
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 0035-8711
  - 1365-2966
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Limits on population III star formation in minihaloes implied by Planck
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 453
year: '2015'
...
---
_id: '17685'
abstract:
- lang: eng
  text: We propose an observational test for gravitationally recoiling supermassive
    black holes (BHs) in active galactic nuclei, based on a correlation between the
    velocities of BHs relative to their host galaxies, |\Delta v|, and their obscuring
    dust column densities, \Sigma_{dust} (both measured along the line of sight).
    We use toy models for the distribution of recoil velocities, BH trajectories,
    and the geometry of obscuring dust tori in galactic centres, to simulate 2.5x10^5
    random observations of recoiling quasars. BHs with recoil velocities comparable
    to the escape velocity from the galactic centre remain bound to the nucleus, and
    do not fully settle back to the centre of the torus due to dynamical friction
    in a typical quasar lifetime. We find that |\Delta v| and \Sigma_ {dust} for these
    BHs are positively correlated. For obscured (\Sigma_{dust}>0) and for partially
    obscured (0<\Sigma_{dust}<~2.3 g/m^2) quasars with |\Delta v|>=45 km/s, the sample
    correlation coefficient between log10(|\Delta v|) and \Sigma_{dust} is r_{45}
    = 0.28+/-0.02 and r_{45} = 0.13+/-0.02, respectively. Allowing for random +/-100
    km/s errors in |\Delta v| unrelated to the recoil dilutes the correlation for
    the partially obscured quasars to r_{45} = 0.026+/-0.004 measured between |\Delta
    v| and \Sigma_{dust}. A random sample of >~3,500 obscured quasars with |\Delta
    v|>=45 km/s would allow rejection of the no-correlation hypothesis with 3 sigma
    significance 95% of the time. Finally, we find that the fraction of obscured quasars,
    F_{obs}(|\Delta v|), decreases with |\Delta v| from F_{obs}(<10 km/s)>~0.8 to
    F_{obs}(>10^3 km/s)<~0.4. This predicted trend can be compared to the observed
    fraction of type II quasars, and can further test combinations of recoil, trajectory,
    and dust torus models.
article_processing_charge: No
article_type: original
author:
- first_name: P.
  full_name: Raffai, P.
  last_name: Raffai
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
- first_name: Z.
  full_name: Frei, Z.
  last_name: Frei
citation:
  ama: Raffai P, Haiman Z, Frei Z. A statistical method to search for recoiling supermassive
    black holes in active galactic nuclei. <i>Monthly Notices of the Royal Astronomical
    Society</i>. 2015;455(1):484-492. doi:<a href="https://doi.org/10.1093/mnras/stv2371">10.1093/mnras/stv2371</a>
  apa: Raffai, P., Haiman, Z., &#38; Frei, Z. (2015). A statistical method to search
    for recoiling supermassive black holes in active galactic nuclei. <i>Monthly Notices
    of the Royal Astronomical Society</i>. Oxford University Press. <a href="https://doi.org/10.1093/mnras/stv2371">https://doi.org/10.1093/mnras/stv2371</a>
  chicago: Raffai, P., Zoltán Haiman, and Z. Frei. “A Statistical Method to Search
    for Recoiling Supermassive Black Holes in Active Galactic Nuclei.” <i>Monthly
    Notices of the Royal Astronomical Society</i>. Oxford University Press, 2015.
    <a href="https://doi.org/10.1093/mnras/stv2371">https://doi.org/10.1093/mnras/stv2371</a>.
  ieee: P. Raffai, Z. Haiman, and Z. Frei, “A statistical method to search for recoiling
    supermassive black holes in active galactic nuclei,” <i>Monthly Notices of the
    Royal Astronomical Society</i>, vol. 455, no. 1. Oxford University Press, pp.
    484–492, 2015.
  ista: Raffai P, Haiman Z, Frei Z. 2015. A statistical method to search for recoiling
    supermassive black holes in active galactic nuclei. Monthly Notices of the Royal
    Astronomical Society. 455(1), 484–492.
  mla: Raffai, P., et al. “A Statistical Method to Search for Recoiling Supermassive
    Black Holes in Active Galactic Nuclei.” <i>Monthly Notices of the Royal Astronomical
    Society</i>, vol. 455, no. 1, Oxford University Press, 2015, pp. 484–92, doi:<a
    href="https://doi.org/10.1093/mnras/stv2371">10.1093/mnras/stv2371</a>.
  short: P. Raffai, Z. Haiman, Z. Frei, Monthly Notices of the Royal Astronomical
    Society 455 (2015) 484–492.
date_created: 2024-09-06T08:20:30Z
date_published: 2015-11-02T00:00:00Z
date_updated: 2024-09-25T09:18:47Z
day: '02'
doi: 10.1093/mnras/stv2371
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/stv2371
intvolume: '       455'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1093/mnras/stv2371
month: '11'
oa: 1
oa_version: Published Version
page: 484-492
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 0035-8711
  - 1365-2966
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: A statistical method to search for recoiling supermassive black holes in active
  galactic nuclei
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 455
year: '2015'
...
---
_id: '17694'
abstract:
- lang: eng
  text: Constraining the properties of Population III (Pop III) stars will be very
    challenging because they reside in small galaxies at high redshift which will
    be difficult to directly detect. In this paper, we suggest that intensity mapping
    may be a promising method to study Pop III stars. Intensity mapping is a technique
    proposed to measure large-scale fluctuations of galaxy line emission in three
    dimensions without resolving individual sources. This technique is well suited
    for observing many faint galaxies because it can measure their cumulative emission
    even if they cannot be directly detected. We focus on intensity mapping of He
    ii recombination lines. These lines are much stronger in Pop III stars than Pop
    II stars because the harder spectra of Pop III stars are expected to produce many
    He ii ionizing photons. Measuring the He ii 1640 Å intensity mapping signal, along
    with the signals from other lines such as Lyα, Hα, and metal lines, could give
    constraints on the initial mass function (IMF) and star formation rate density
    of Pop III stars as a function of redshift. To demonstrate the feasibility of
    these observations, we estimate the strength of the Pop III He ii 1640 Å intensity
    mapping signal from z = 10–20. We show that at z ≈ 10, the signal could be measured
    accurately by two different hypothetical future instruments, one which cross-correlates
    He ii 1640 Å with CO(1–0) line emission from galaxies and the other with 21 cm
    emission from the intergalactic medium.
article_processing_charge: No
article_type: original
author:
- first_name: Eli
  full_name: Visbal, Eli
  last_name: Visbal
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
- first_name: Greg L.
  full_name: Bryan, Greg L.
  last_name: Bryan
citation:
  ama: Visbal E, Haiman Z, Bryan GL. Looking for Population III stars with He ii line
    intensity mapping. <i>Monthly Notices of the Royal Astronomical Society</i>. 2015;450(3):2506-2513.
    doi:<a href="https://doi.org/10.1093/mnras/stv785">10.1093/mnras/stv785</a>
  apa: Visbal, E., Haiman, Z., &#38; Bryan, G. L. (2015). Looking for Population III
    stars with He ii line intensity mapping. <i>Monthly Notices of the Royal Astronomical
    Society</i>. Oxford University Press. <a href="https://doi.org/10.1093/mnras/stv785">https://doi.org/10.1093/mnras/stv785</a>
  chicago: Visbal, Eli, Zoltán Haiman, and Greg L. Bryan. “Looking for Population
    III Stars with He Ii Line Intensity Mapping.” <i>Monthly Notices of the Royal
    Astronomical Society</i>. Oxford University Press, 2015. <a href="https://doi.org/10.1093/mnras/stv785">https://doi.org/10.1093/mnras/stv785</a>.
  ieee: E. Visbal, Z. Haiman, and G. L. Bryan, “Looking for Population III stars with
    He ii line intensity mapping,” <i>Monthly Notices of the Royal Astronomical Society</i>,
    vol. 450, no. 3. Oxford University Press, pp. 2506–2513, 2015.
  ista: Visbal E, Haiman Z, Bryan GL. 2015. Looking for Population III stars with
    He ii line intensity mapping. Monthly Notices of the Royal Astronomical Society.
    450(3), 2506–2513.
  mla: Visbal, Eli, et al. “Looking for Population III Stars with He Ii Line Intensity
    Mapping.” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 450,
    no. 3, Oxford University Press, 2015, pp. 2506–13, doi:<a href="https://doi.org/10.1093/mnras/stv785">10.1093/mnras/stv785</a>.
  short: E. Visbal, Z. Haiman, G.L. Bryan, Monthly Notices of the Royal Astronomical
    Society 450 (2015) 2506–2513.
date_created: 2024-09-06T08:40:33Z
date_published: 2015-05-06T00:00:00Z
date_updated: 2024-09-25T10:05:24Z
day: '06'
doi: 10.1093/mnras/stv785
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/stv785
intvolume: '       450'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1093/mnras/stv785
month: '05'
oa: 1
oa_version: Published Version
page: 2506-2513
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 0035-8711
  - 1365-2966
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Looking for Population III stars with He ii line intensity mapping
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 450
year: '2015'
...
---
_id: '11582'
abstract:
- lang: eng
  text: We have observed a sample of typical z ∼ 1 star-forming galaxies, selected
    from the HiZELS survey, with the new K-band Multi-Object Spectrograph (KMOS) near-infrared,
    multi-integral field unit instrument on the Very Large Telescope (VLT), in order
    to obtain their dynamics and metallicity gradients. The majority of our galaxies
    have a metallicity gradient consistent with being flat or negative (i.e. higher
    metallicity cores than outskirts). Intriguingly, we find a trend between metallicity
    gradient and specific star formation rate (sSFR), such that galaxies with a high
    sSFR tend to have relatively metal poor centres, a result which is strengthened
    when combined with data sets from the literature. This result appears to explain
    the discrepancies reported between different high-redshift studies and varying
    claims for evolution. From a galaxy evolution perspective, the trend we see would
    mean that a galaxy's sSFR is governed by the amount of metal-poor gas that can
    be funnelled into its core, triggered either by merging or through efficient accretion.
    In fact, merging may play a significant role as it is the starburst galaxies at
    all epochs, which have the more positive metallicity gradients. Our results may
    help to explain the origin of the fundamental metallicity relation, in which galaxies
    at a fixed mass are observed to have lower metallicities at higher star formation
    rates, especially if the metallicity is measured in an aperture encompassing only
    the central regions of the galaxy. Finally, we note that this study demonstrates
    the power of KMOS as an efficient instrument for large-scale resolved galaxy surveys.
acknowledgement: First, we acknowledge the referee for their comments, which have
  improved the clarity of this paper. JPS and IRS acknowledge support from STFC (ST/I001573/1).
  IRS also acknowledges support from the ERC Advanced Investigator programme DUSTYGAL
  and a Royal Society/Wolfson Merit Award. DS acknowledges financial support from
  NWO through a Veni fellowship and from FCT through the award of an FCT-IF starting
  grant. PNB acknowledges STFC for financial support.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: John P.
  full_name: Stott, John P.
  last_name: Stott
- first_name: David
  full_name: Sobral, David
  last_name: Sobral
- first_name: A. M.
  full_name: Swinbank, A. M.
  last_name: Swinbank
- first_name: Ian
  full_name: Smail, Ian
  last_name: Smail
- first_name: Richard
  full_name: Bower, Richard
  last_name: Bower
- first_name: Philip N.
  full_name: Best, Philip N.
  last_name: Best
- first_name: Ray M.
  full_name: Sharples, Ray M.
  last_name: Sharples
- first_name: James E.
  full_name: Geach, James E.
  last_name: Geach
- first_name: Jorryt J
  full_name: Matthee, Jorryt J
  id: 7439a258-f3c0-11ec-9501-9df22fe06720
  last_name: Matthee
  orcid: 0000-0003-2871-127X
citation:
  ama: Stott JP, Sobral D, Swinbank AM, et al. A relationship between specific star
    formation rate and metallicity gradient within z ∼ 1 galaxies from KMOS-HiZELS.
    <i>Monthly Notices of the Royal Astronomical Society</i>. 2014;443(3):2695-2704.
    doi:<a href="https://doi.org/10.1093/mnras/stu1343">10.1093/mnras/stu1343</a>
  apa: Stott, J. P., Sobral, D., Swinbank, A. M., Smail, I., Bower, R., Best, P. N.,
    … Matthee, J. J. (2014). A relationship between specific star formation rate and
    metallicity gradient within z ∼ 1 galaxies from KMOS-HiZELS. <i>Monthly Notices
    of the Royal Astronomical Society</i>. Oxford University Press. <a href="https://doi.org/10.1093/mnras/stu1343">https://doi.org/10.1093/mnras/stu1343</a>
  chicago: Stott, John P., David Sobral, A. M. Swinbank, Ian Smail, Richard Bower,
    Philip N. Best, Ray M. Sharples, James E. Geach, and Jorryt J Matthee. “A Relationship
    between Specific Star Formation Rate and Metallicity Gradient within z ∼ 1 Galaxies
    from KMOS-HiZELS.” <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford
    University Press, 2014. <a href="https://doi.org/10.1093/mnras/stu1343">https://doi.org/10.1093/mnras/stu1343</a>.
  ieee: J. P. Stott <i>et al.</i>, “A relationship between specific star formation
    rate and metallicity gradient within z ∼ 1 galaxies from KMOS-HiZELS,” <i>Monthly
    Notices of the Royal Astronomical Society</i>, vol. 443, no. 3. Oxford University
    Press, pp. 2695–2704, 2014.
  ista: Stott JP, Sobral D, Swinbank AM, Smail I, Bower R, Best PN, Sharples RM, Geach
    JE, Matthee JJ. 2014. A relationship between specific star formation rate and
    metallicity gradient within z ∼ 1 galaxies from KMOS-HiZELS. Monthly Notices of
    the Royal Astronomical Society. 443(3), 2695–2704.
  mla: Stott, John P., et al. “A Relationship between Specific Star Formation Rate
    and Metallicity Gradient within z ∼ 1 Galaxies from KMOS-HiZELS.” <i>Monthly Notices
    of the Royal Astronomical Society</i>, vol. 443, no. 3, Oxford University Press,
    2014, pp. 2695–704, doi:<a href="https://doi.org/10.1093/mnras/stu1343">10.1093/mnras/stu1343</a>.
  short: J.P. Stott, D. Sobral, A.M. Swinbank, I. Smail, R. Bower, P.N. Best, R.M.
    Sharples, J.E. Geach, J.J. Matthee, Monthly Notices of the Royal Astronomical
    Society 443 (2014) 2695–2704.
date_created: 2022-07-14T12:16:10Z
date_published: 2014-09-21T00:00:00Z
date_updated: 2022-08-19T08:27:25Z
day: '21'
doi: 10.1093/mnras/stu1343
extern: '1'
external_id:
  arxiv:
  - '1407.1047'
fulldoi: https://doi.org/10.1093/mnras/stu1343
intvolume: '       443'
issue: '3'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
- 'galaxies: abundances'
- 'galaxies: evolution'
- 'galaxies: kinematics and dynamics'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1407.1047
month: '09'
oa: 1
oa_version: Preprint
page: 2695-2704
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  eissn:
  - 1365-2966
  issn:
  - 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: A relationship between specific star formation rate and metallicity gradient
  within z ∼ 1 galaxies from KMOS-HiZELS
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 443
year: '2014'
...
---
_id: '11583'
abstract:
- lang: eng
  text: 'Candidate galaxies at redshifts of z ∼ 10 are now being found in extremely
    deep surveys, probing very small areas. As a consequence, candidates are very
    faint, making spectroscopic confirmation practically impossible. In order to overcome
    such limitations, we have undertaken the CF-HiZELS survey, which is a large-area,
    medium-depth near-infrared narrow-band survey targeted at z = 8.8 Lyman α (Lyα)
    emitters (LAEs) and covering 10 deg2 in part of the SSA22 field with the Canada–France–Hawaii
    Telescope (CFHT). We surveyed a comoving volume of 4.7 × 106 Mpc3 to a Lyα luminosity
    limit of 6.3 × 1043舁erg舁s−1. We look for Lyα candidates by applying the following
    criteria: (i) clear emission-line source, (ii) no optical detections (ugriz from
    CFHTLS), (iii) no visible detection in the optical stack (ugriz > 27), (iv) visually
    checked reliable NBJ and J detections and (v) J − K ≤ 0. We compute photometric
    redshifts and remove a significant amount of dusty lower redshift line-emitters
    at z ∼ 1.4 or 2.2. A total of 13 Lyα candidates were found, of which two are marked
    as strong candidates, but the majority have very weak constraints on their spectral
    energy distributions. Using follow-up observations with SINFONI/VLT, we are able
    to exclude the most robust candidates as LAEs. We put a strong constraint on the
    Lyα luminosity function at z ∼ 9 and make realistic predictions for ongoing and
    future surveys. Our results show that surveys for the highest redshift LAEs are
    susceptible of multiple contaminations and that spectroscopic follow-up is absolutely
    necessary.'
acknowledgement: We thank the anonymous referee for the comments and suggestions which
  improved both the quality and clarity of this work. DS acknowledges financial support
  from the Netherlands Organisation for Scientific Research (NWO) through a Veni fellowship.
  IRS acknowledges support from STFC (ST/I001573/1), a Leverhulme Fellowship, the
  ERC Advanced Investigator programme DUSTYGAL 321334 and a Royal Society/Wolfson
  Merit Award. PNB acknowledges support from the Leverhulme Trust. JWK acknowledges
  the support from the Creative Research Initiative Program, no. 2008- 0060544, of
  the National Research Foundation of Korea (NRF) funded by the Korean government
  (MSIP). JPUF and BMJ acknowledge support from the ERC-StG grant EGGS-278202. The
  Dark Cosmology Centre is funded by the Danish National Research Foundation. This
  work is based in part on data obtained as part of the UKIRT Infrared Deep Sky Survey.
  Based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and
  CEA/IRFU, at the Canada–France–Hawaii Telescope (CFHT) which is operated by the
  National Research Council (NRC) of Canada, the Institut National des Science de
  l’Univers of the Centre National de la Recherche Scientifique (CNRS) of France and
  the University of Hawaii. This work is based in part on data products produced at
  Terapix available at the Canadian Astronomy Data Centre as part of the Canada-France-Hawaii
  Telescope Legacy Survey, a collaborative project of NRC and CNRS. This work was
  only possible due to OPTICON/FP7 and the access that it granted to the CFHT telescope.
  The authors also wish to acknowledge the CFHTLS and UKIDSS surveys for their excellent
  legacy and complementary value – without such high-quality data sets, this research
  would not have been possible.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Jorryt J
  full_name: Matthee, Jorryt J
  id: 7439a258-f3c0-11ec-9501-9df22fe06720
  last_name: Matthee
  orcid: 0000-0003-2871-127X
- first_name: David
  full_name: Sobral, David
  last_name: Sobral
- first_name: A. M.
  full_name: Swinbank, A. M.
  last_name: Swinbank
- first_name: Ian
  full_name: Smail, Ian
  last_name: Smail
- first_name: P. N.
  full_name: Best, P. N.
  last_name: Best
- first_name: Jae-Woo
  full_name: Kim, Jae-Woo
  last_name: Kim
- first_name: Marijn
  full_name: Franx, Marijn
  last_name: Franx
- first_name: Bo
  full_name: Milvang-Jensen, Bo
  last_name: Milvang-Jensen
- first_name: Johan
  full_name: Fynbo, Johan
  last_name: Fynbo
citation:
  ama: 'Matthee JJ, Sobral D, Swinbank AM, et al. A 10 deg2 Lyman α survey at z=8.8
    with spectroscopic follow-up: Strong constraints on the luminosity function and
    implications for other surveys. <i>Monthly Notices of the Royal Astronomical Society</i>.
    2014;440(3):2375-2387. doi:<a href="https://doi.org/10.1093/mnras/stu392">10.1093/mnras/stu392</a>'
  apa: 'Matthee, J. J., Sobral, D., Swinbank, A. M., Smail, I., Best, P. N., Kim,
    J.-W., … Fynbo, J. (2014). A 10 deg2 Lyman α survey at z=8.8 with spectroscopic
    follow-up: Strong constraints on the luminosity function and implications for
    other surveys. <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford
    University Press. <a href="https://doi.org/10.1093/mnras/stu392">https://doi.org/10.1093/mnras/stu392</a>'
  chicago: 'Matthee, Jorryt J, David Sobral, A. M. Swinbank, Ian Smail, P. N. Best,
    Jae-Woo Kim, Marijn Franx, Bo Milvang-Jensen, and Johan Fynbo. “A 10 Deg2 Lyman
    α Survey at Z=8.8 with Spectroscopic Follow-up: Strong Constraints on the Luminosity
    Function and Implications for Other Surveys.” <i>Monthly Notices of the Royal
    Astronomical Society</i>. Oxford University Press, 2014. <a href="https://doi.org/10.1093/mnras/stu392">https://doi.org/10.1093/mnras/stu392</a>.'
  ieee: 'J. J. Matthee <i>et al.</i>, “A 10 deg2 Lyman α survey at z=8.8 with spectroscopic
    follow-up: Strong constraints on the luminosity function and implications for
    other surveys,” <i>Monthly Notices of the Royal Astronomical Society</i>, vol.
    440, no. 3. Oxford University Press, pp. 2375–2387, 2014.'
  ista: 'Matthee JJ, Sobral D, Swinbank AM, Smail I, Best PN, Kim J-W, Franx M, Milvang-Jensen
    B, Fynbo J. 2014. A 10 deg2 Lyman α survey at z=8.8 with spectroscopic follow-up:
    Strong constraints on the luminosity function and implications for other surveys.
    Monthly Notices of the Royal Astronomical Society. 440(3), 2375–2387.'
  mla: 'Matthee, Jorryt J., et al. “A 10 Deg2 Lyman α Survey at Z=8.8 with Spectroscopic
    Follow-up: Strong Constraints on the Luminosity Function and Implications for
    Other Surveys.” <i>Monthly Notices of the Royal Astronomical Society</i>, vol.
    440, no. 3, Oxford University Press, 2014, pp. 2375–87, doi:<a href="https://doi.org/10.1093/mnras/stu392">10.1093/mnras/stu392</a>.'
  short: J.J. Matthee, D. Sobral, A.M. Swinbank, I. Smail, P.N. Best, J.-W. Kim, M.
    Franx, B. Milvang-Jensen, J. Fynbo, Monthly Notices of the Royal Astronomical
    Society 440 (2014) 2375–2387.
date_created: 2022-07-14T12:33:24Z
date_published: 2014-05-21T00:00:00Z
date_updated: 2024-10-14T11:37:28Z
day: '21'
doi: 10.1093/mnras/stu392
extern: '1'
external_id:
  arxiv:
  - '1402.6697'
fulldoi: https://doi.org/10.1093/mnras/stu392
intvolume: '       440'
issue: '3'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
- 'galaxies: evolution'
- 'galaxies: high-redshift'
- 'cosmology: observations'
- dark ages
- reionization
- first stars
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1402.6697
month: '05'
oa: 1
oa_version: Preprint
page: 2375-2387
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  eissn:
  - 1365-2966
  issn:
  - 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'A 10 deg2 Lyman α survey at z=8.8 with spectroscopic follow-up: Strong constraints
  on the luminosity function and implications for other surveys'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 440
year: '2014'
...
---
_id: '17614'
abstract:
- lang: eng
  text: The first generation of stars produces a background of Lyman–Werner (LW) radiation
    which can photodissociate molecular hydrogen, increasing the mass of dark matter
    haloes required to host star formation. Previous studies have determined the critical
    mass required for efficient molecular cooling with a constant LW background. However,
    the true background is expected to increase rapidly at early times. Neglecting
    this evolution could underestimate star formation in small haloes that may have
    started to cool in the past when the LW intensity was much lower. Background evolution
    is a large source of uncertainty in pre-reionization predictions of the cosmological
    21cm signal, which can be observed with future radio telescopes. To address this,
    we perform zero-dimensional one-zone calculations that follow the density, chemical
    abundances, and temperature of gas in the central regions of dark matter haloes,
    including hierarchical growth and an evolving LW background. We begin by studying
    the physics of haloes subjected to a background that increases exponentially with
    redshift. We find that when the intensity increases more slowly than JLW(z)∝10−z/5,
    cooling in the past is a relatively small effect. We then self-consistently compute
    the cosmological LW background over z = 15–50 and find that cooling in the past
    due to an evolving background has a modest impact. Finally, we compare these results
    to three-dimensional hydrodynamical cosmological simulations with varying LW histories.
    While only a small number of haloes were simulated, the results are consistent
    with our one-zone calculations.
article_processing_charge: No
article_type: original
author:
- first_name: Eli
  full_name: Visbal, Eli
  last_name: Visbal
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
- first_name: Bryan
  full_name: Terrazas, Bryan
  last_name: Terrazas
- first_name: Greg L.
  full_name: Bryan, Greg L.
  last_name: Bryan
- first_name: Rennan
  full_name: Barkana, Rennan
  last_name: Barkana
citation:
  ama: Visbal E, Haiman Z, Terrazas B, Bryan GL, Barkana R. High-redshift star formation
    in a time-dependent Lyman–Werner background. <i>Monthly Notices of the Royal Astronomical
    Society</i>. 2014;445(1):107-114. doi:<a href="https://doi.org/10.1093/mnras/stu1710">10.1093/mnras/stu1710</a>
  apa: Visbal, E., Haiman, Z., Terrazas, B., Bryan, G. L., &#38; Barkana, R. (2014).
    High-redshift star formation in a time-dependent Lyman–Werner background. <i>Monthly
    Notices of the Royal Astronomical Society</i>. Oxford University Press. <a href="https://doi.org/10.1093/mnras/stu1710">https://doi.org/10.1093/mnras/stu1710</a>
  chicago: Visbal, Eli, Zoltán Haiman, Bryan Terrazas, Greg L. Bryan, and Rennan Barkana.
    “High-Redshift Star Formation in a Time-Dependent Lyman–Werner Background.” <i>Monthly
    Notices of the Royal Astronomical Society</i>. Oxford University Press, 2014.
    <a href="https://doi.org/10.1093/mnras/stu1710">https://doi.org/10.1093/mnras/stu1710</a>.
  ieee: E. Visbal, Z. Haiman, B. Terrazas, G. L. Bryan, and R. Barkana, “High-redshift
    star formation in a time-dependent Lyman–Werner background,” <i>Monthly Notices
    of the Royal Astronomical Society</i>, vol. 445, no. 1. Oxford University Press,
    pp. 107–114, 2014.
  ista: Visbal E, Haiman Z, Terrazas B, Bryan GL, Barkana R. 2014. High-redshift star
    formation in a time-dependent Lyman–Werner background. Monthly Notices of the
    Royal Astronomical Society. 445(1), 107–114.
  mla: Visbal, Eli, et al. “High-Redshift Star Formation in a Time-Dependent Lyman–Werner
    Background.” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 445,
    no. 1, Oxford University Press, 2014, pp. 107–14, doi:<a href="https://doi.org/10.1093/mnras/stu1710">10.1093/mnras/stu1710</a>.
  short: E. Visbal, Z. Haiman, B. Terrazas, G.L. Bryan, R. Barkana, Monthly Notices
    of the Royal Astronomical Society 445 (2014) 107–114.
date_created: 2024-09-05T13:30:21Z
date_published: 2014-09-22T00:00:00Z
date_updated: 2024-09-24T07:43:44Z
day: '22'
doi: 10.1093/mnras/stu1710
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/stu1710
intvolume: '       445'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1093/mnras/stu1710
month: '09'
oa: 1
oa_version: Published Version
page: 107-114
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 0035-8711
  - 1365-2966
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: High-redshift star formation in a time-dependent Lyman–Werner background
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 445
year: '2014'
...
---
_id: '17637'
abstract:
- lang: eng
  text: Supermassive stars (SMSs; >10^5 Msun) formed in the first protogalaxies with
    virial temperature T_vir>10^4 K are expected to collapse into seeds of supermassive
    black hole (SMBHs) in the high-redshift universe (z>7). Fragmentation of the primordial
    gas is, however, a possible obstacle to SMS formation. We discuss the expected
    properties of a compact, metal-free, marginally unstable nuclear protogalactic
    disk, and the fate of the clumps formed in the disk by gravitational instability.
    Interior to a characteristic radius R_f=few*10^{-2} pc, the disk fragments into
    massive clumps with M_c~30 Msun. The clumps grow via accretion and migrate inward
    rapidly on a timescale of ~10^4 yr, which is comparable or shorter than the Kelvin-Helmholz
    time >10^4 yr. Some clumps may evolve to zero-age main sequence stars and halt
    gas accretion by radiative feedback, but most of the clumps can migrate inward
    and merge with the central protostar before forming massive stars. Moreover, we
    found that dust-induced-fragmentation in metal-enriched gas does not modify these
    conclusions unless Z> 3*10^{-4} Zsun, because clump migration below this metallicity
    remains as rapid as in the primordial case. Our results suggest that fragmentation
    of a compact, metal--poor disk can not prevent the formation of a SMS.
article_processing_charge: No
article_type: original
author:
- first_name: Kohei
  full_name: Inayoshi, Kohei
  last_name: Inayoshi
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
citation:
  ama: Inayoshi K, Haiman Z. Does disc fragmentation prevent the formation of supermassive
    stars in protogalaxies? <i>Monthly Notices of the Royal Astronomical Society</i>.
    2014;445(2):1549-1557. doi:<a href="https://doi.org/10.1093/mnras/stu1870">10.1093/mnras/stu1870</a>
  apa: Inayoshi, K., &#38; Haiman, Z. (2014). Does disc fragmentation prevent the
    formation of supermassive stars in protogalaxies? <i>Monthly Notices of the Royal
    Astronomical Society</i>. Oxford University Press. <a href="https://doi.org/10.1093/mnras/stu1870">https://doi.org/10.1093/mnras/stu1870</a>
  chicago: Inayoshi, Kohei, and Zoltán Haiman. “Does Disc Fragmentation Prevent the
    Formation of Supermassive Stars in Protogalaxies?” <i>Monthly Notices of the Royal
    Astronomical Society</i>. Oxford University Press, 2014. <a href="https://doi.org/10.1093/mnras/stu1870">https://doi.org/10.1093/mnras/stu1870</a>.
  ieee: K. Inayoshi and Z. Haiman, “Does disc fragmentation prevent the formation
    of supermassive stars in protogalaxies?,” <i>Monthly Notices of the Royal Astronomical
    Society</i>, vol. 445, no. 2. Oxford University Press, pp. 1549–1557, 2014.
  ista: Inayoshi K, Haiman Z. 2014. Does disc fragmentation prevent the formation
    of supermassive stars in protogalaxies? Monthly Notices of the Royal Astronomical
    Society. 445(2), 1549–1557.
  mla: Inayoshi, Kohei, and Zoltán Haiman. “Does Disc Fragmentation Prevent the Formation
    of Supermassive Stars in Protogalaxies?” <i>Monthly Notices of the Royal Astronomical
    Society</i>, vol. 445, no. 2, Oxford University Press, 2014, pp. 1549–57, doi:<a
    href="https://doi.org/10.1093/mnras/stu1870">10.1093/mnras/stu1870</a>.
  short: K. Inayoshi, Z. Haiman, Monthly Notices of the Royal Astronomical Society
    445 (2014) 1549–1557.
date_created: 2024-09-06T07:15:08Z
date_published: 2014-10-09T00:00:00Z
date_updated: 2024-09-24T11:33:30Z
day: '09'
doi: 10.1093/mnras/stu1870
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/stu1870
intvolume: '       445'
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1093/mnras/stu1870
month: '10'
oa: 1
oa_version: Published Version
page: 1549-1557
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 1365-2966
  - 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Does disc fragmentation prevent the formation of supermassive stars in protogalaxies?
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 445
year: '2014'
...
---
_id: '17642'
abstract:
- lang: eng
  text: The presence of quasars at redshifts z > 6 indicates the existence of supermassive
    black holes (SMBHs) as massive as a few times 10^9 Msun, challenging models for
    SMBH formation. One pathway is through the direct collapse of gas in T_{vir} >
    10^4 K halos; however, this requires the suppression of H_2 cooling to prevent
    fragmentation. In this paper, we examine a proposed new mechanism for this suppression
    which relies on cold-mode accretion flows leading to shocks at high densities
    (n > 10^4 cm^{-3}) and temperatures (T > 10^4 K). In such gas, H_2 is efficiently
    collisionally dissociated. We use high-resolution numerical simulations to test
    this idea, demonstrating that such halos typically have lower temperature progenitors,
    in which cooling is efficient. Those halos do show filamentary flows; however,
    the gas shocks at or near the virial radius (at low densities), thus preventing
    the proposed collisional mechanism from operating. We do find that, if we artificially
    suppress H_2 formation with a high UV background, so as to allow gas in the halo
    center to enter the high-temperature, high-density "zone of no return", it will
    remain there even if the UV flux is turned off, collapsing to high density at
    high temperature. Due to computational limitations, we simulated only three halos.
    However, we demonstrate, using Monte Carlo calculations of 10^6 halo merger histories,
    that a few rare halos could assemble rapidly enough to avoid efficient H_2 cooling
    in all of their progenitor halos, provided that the UV background exceeds J_{21}
    ~ few at redshifts as high as z ~ 20
article_processing_charge: No
article_type: original
author:
- first_name: Ricardo
  full_name: Fernandez, Ricardo
  last_name: Fernandez
- first_name: Greg L.
  full_name: Bryan, Greg L.
  last_name: Bryan
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
- first_name: Miao
  full_name: Li, Miao
  last_name: Li
citation:
  ama: 'Fernandez R, Bryan GL, Haiman Z, Li M. H2 suppression with shocking inflows:
    Testing a pathway for supermassive black hole formation. <i>Monthly Notices of
    the Royal Astronomical Society</i>. 2014;439(4):3798-3807. doi:<a href="https://doi.org/10.1093/mnras/stu230">10.1093/mnras/stu230</a>'
  apa: 'Fernandez, R., Bryan, G. L., Haiman, Z., &#38; Li, M. (2014). H2 suppression
    with shocking inflows: Testing a pathway for supermassive black hole formation.
    <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press.
    <a href="https://doi.org/10.1093/mnras/stu230">https://doi.org/10.1093/mnras/stu230</a>'
  chicago: 'Fernandez, Ricardo, Greg L. Bryan, Zoltán Haiman, and Miao Li. “H2 Suppression
    with Shocking Inflows: Testing a Pathway for Supermassive Black Hole Formation.”
    <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press,
    2014. <a href="https://doi.org/10.1093/mnras/stu230">https://doi.org/10.1093/mnras/stu230</a>.'
  ieee: 'R. Fernandez, G. L. Bryan, Z. Haiman, and M. Li, “H2 suppression with shocking
    inflows: Testing a pathway for supermassive black hole formation,” <i>Monthly
    Notices of the Royal Astronomical Society</i>, vol. 439, no. 4. Oxford University
    Press, pp. 3798–3807, 2014.'
  ista: 'Fernandez R, Bryan GL, Haiman Z, Li M. 2014. H2 suppression with shocking
    inflows: Testing a pathway for supermassive black hole formation. Monthly Notices
    of the Royal Astronomical Society. 439(4), 3798–3807.'
  mla: 'Fernandez, Ricardo, et al. “H2 Suppression with Shocking Inflows: Testing
    a Pathway for Supermassive Black Hole Formation.” <i>Monthly Notices of the Royal
    Astronomical Society</i>, vol. 439, no. 4, Oxford University Press, 2014, pp.
    3798–807, doi:<a href="https://doi.org/10.1093/mnras/stu230">10.1093/mnras/stu230</a>.'
  short: R. Fernandez, G.L. Bryan, Z. Haiman, M. Li, Monthly Notices of the Royal
    Astronomical Society 439 (2014) 3798–3807.
date_created: 2024-09-06T07:21:52Z
date_published: 2014-02-26T00:00:00Z
date_updated: 2024-09-24T11:56:43Z
day: '26'
doi: 10.1093/mnras/stu230
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/stu230
intvolume: '       439'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1093/mnras/stu230
month: '02'
oa: 1
oa_version: Published Version
page: 3798-3807
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 1365-2966
  - 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'H2 suppression with shocking inflows: Testing a pathway for supermassive black
  hole formation'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 439
year: '2014'
...
---
_id: '17645'
abstract:
- lang: eng
  text: The rapid decline in the number of strong Lyman Alpha (Lya) emitting galaxies
    at z > 6 provides evidence for neutral hydrogen in the IGM, but is difficult to
    explain with plausible models for reionization. We demonstrate that the observed
    reduction in Lya flux from galaxies at z > 6 can be explained by evolution in
    the escape fraction of ionizing photons, f_esc. We find that the median observed
    drop in the fraction of galaxies showing strong Lya emission, as well as the observed
    evolution of the Lya luminosity function both follow from a small increase in
    f_esc of Delta f_esc ~ 0.1 from f_esc ~ 0.6 at z ~ 6. This high escape fraction
    may be at odds with current constraints on the ionising photon escape fraction,
    which favor smaller values of f_esc < 20%. However, models that invoke a redshift
    evolution of f_ esc that is consistent with these constraints can suppress the
    z~7 Lya flux to the observed level, if they also include a small evolution in
    global neutral fraction of Delta x_HI ~ 0.2. Thus, an evolving escape fraction
    of ionising photons can be a plausible part of the explanation for evolution in
    the Lya emission of high redshift galaxies. More generally, our analysis also
    shows that the drop in the Lya fraction is quantitatively consistent with the
    observed evolution in the Lya luminosity functions of Lya Emitters.
article_processing_charge: No
article_type: original
author:
- first_name: Mark
  full_name: Dijkstra, Mark
  last_name: Dijkstra
- first_name: Stuart
  full_name: Wyithe, Stuart
  last_name: Wyithe
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
- first_name: Andrei
  full_name: Mesinger, Andrei
  last_name: Mesinger
- first_name: Laura
  full_name: Pentericci, Laura
  last_name: Pentericci
citation:
  ama: Dijkstra M, Wyithe S, Haiman Z, Mesinger A, Pentericci L. Evolution in the
    escape fraction of ionizing photons and the decline in strong Lyα emission from
    z &#62; 6 galaxies. <i>Monthly Notices of the Royal Astronomical Society</i>.
    2014;440(4):3309-3316. doi:<a href="https://doi.org/10.1093/mnras/stu531">10.1093/mnras/stu531</a>
  apa: Dijkstra, M., Wyithe, S., Haiman, Z., Mesinger, A., &#38; Pentericci, L. (2014).
    Evolution in the escape fraction of ionizing photons and the decline in strong
    Lyα emission from z &#62; 6 galaxies. <i>Monthly Notices of the Royal Astronomical
    Society</i>. Oxford University Press. <a href="https://doi.org/10.1093/mnras/stu531">https://doi.org/10.1093/mnras/stu531</a>
  chicago: Dijkstra, Mark, Stuart Wyithe, Zoltán Haiman, Andrei Mesinger, and Laura
    Pentericci. “Evolution in the Escape Fraction of Ionizing Photons and the Decline
    in Strong Lyα Emission from z &#62; 6 Galaxies.” <i>Monthly Notices of the Royal
    Astronomical Society</i>. Oxford University Press, 2014. <a href="https://doi.org/10.1093/mnras/stu531">https://doi.org/10.1093/mnras/stu531</a>.
  ieee: M. Dijkstra, S. Wyithe, Z. Haiman, A. Mesinger, and L. Pentericci, “Evolution
    in the escape fraction of ionizing photons and the decline in strong Lyα emission
    from z &#62; 6 galaxies,” <i>Monthly Notices of the Royal Astronomical Society</i>,
    vol. 440, no. 4. Oxford University Press, pp. 3309–3316, 2014.
  ista: Dijkstra M, Wyithe S, Haiman Z, Mesinger A, Pentericci L. 2014. Evolution
    in the escape fraction of ionizing photons and the decline in strong Lyα emission
    from z &#62; 6 galaxies. Monthly Notices of the Royal Astronomical Society. 440(4),
    3309–3316.
  mla: Dijkstra, Mark, et al. “Evolution in the Escape Fraction of Ionizing Photons
    and the Decline in Strong Lyα Emission from z &#62; 6 Galaxies.” <i>Monthly Notices
    of the Royal Astronomical Society</i>, vol. 440, no. 4, Oxford University Press,
    2014, pp. 3309–16, doi:<a href="https://doi.org/10.1093/mnras/stu531">10.1093/mnras/stu531</a>.
  short: M. Dijkstra, S. Wyithe, Z. Haiman, A. Mesinger, L. Pentericci, Monthly Notices
    of the Royal Astronomical Society 440 (2014) 3309–3316.
date_created: 2024-09-06T07:24:26Z
date_published: 2014-04-17T00:00:00Z
date_updated: 2024-09-24T12:10:12Z
day: '17'
doi: 10.1093/mnras/stu531
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/stu531
intvolume: '       440'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1093/mnras/stu531
month: '04'
oa: 1
oa_version: Published Version
page: 3309-3316
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 1365-2966
  - 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Evolution in the escape fraction of ionizing photons and the decline in strong
  Lyα emission from z > 6 galaxies
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 440
year: '2014'
...
---
_id: '17650'
abstract:
- lang: eng
  text: High-redshift quasar observations imply that supermassive black holes (SMBHs)
    larger than ∼109 M⊙ formed before z=6. That such large SMBHs formed so early in
    the Universe remains an open theoretical problem. One possibility is that gas
    in atomic cooling halos exposed to strong Lyman-Werner (LW) radiation forms 104−106
    M⊙ supermassive stars which quickly collapse into black holes. We propose a scenario
    for direct collapse black hole (DCBH) formation based on synchronized pairs of
    pristine atomic cooling halos. We consider halos at very small separation with
    one halo being a subhalo of the other. The first halo to surpass the atomic cooling
    threshold forms stars. Soon after these stars are formed, the other halo reaches
    the cooling threshold and due to its small distance from the newly formed galaxy,
    is exposed to the critical LW intensity required to form a DCBH. The main advantage
    of this scenario is that synchronization can potentially prevent photoevaporation
    and metal pollution in DCBH-forming halos. Since the halos reach the atomic cooling
    threshold at nearly the same time, the DCBH-forming halo is only exposed to ionizing
    radiation for a brief period. Tight synchronization could allow the DCBH to form
    before stars in the nearby galaxy reach the end of their lives and generate supernovae
    winds. We use N-body simulations to estimate the abundance of DCBHs formed in
    this way. The largest source of uncertainty in our estimate is the initial mass
    function (IMF) of metal free stars formed in atomic cooling halos. We find that
    even for tight synchronization, the density of DCBHs formed in this scenario could
    explain the SMBHs implied by z=6 quasar observations. Metal pollution and photoevaporation
    could potentially reduce the abundance of DCBHs below that required to explain
    the observations in other models that rely on a high LW flux.
article_processing_charge: No
article_type: original
author:
- first_name: Eli
  full_name: Visbal, Eli
  last_name: Visbal
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
- first_name: Greg L.
  full_name: Bryan, Greg L.
  last_name: Bryan
citation:
  ama: Visbal E, Haiman Z, Bryan GL. Direct collapse black hole formation from synchronized
    pairs of atomic cooling haloes. <i>Monthly Notices of the Royal Astronomical Society</i>.
    2014;445(1):1056-1063. doi:<a href="https://doi.org/10.1093/mnras/stu1794">10.1093/mnras/stu1794</a>
  apa: Visbal, E., Haiman, Z., &#38; Bryan, G. L. (2014). Direct collapse black hole
    formation from synchronized pairs of atomic cooling haloes. <i>Monthly Notices
    of the Royal Astronomical Society</i>. Oxford University Press. <a href="https://doi.org/10.1093/mnras/stu1794">https://doi.org/10.1093/mnras/stu1794</a>
  chicago: Visbal, Eli, Zoltán Haiman, and Greg L. Bryan. “Direct Collapse Black Hole
    Formation from Synchronized Pairs of Atomic Cooling Haloes.” <i>Monthly Notices
    of the Royal Astronomical Society</i>. Oxford University Press, 2014. <a href="https://doi.org/10.1093/mnras/stu1794">https://doi.org/10.1093/mnras/stu1794</a>.
  ieee: E. Visbal, Z. Haiman, and G. L. Bryan, “Direct collapse black hole formation
    from synchronized pairs of atomic cooling haloes,” <i>Monthly Notices of the Royal
    Astronomical Society</i>, vol. 445, no. 1. Oxford University Press, pp. 1056–1063,
    2014.
  ista: Visbal E, Haiman Z, Bryan GL. 2014. Direct collapse black hole formation from
    synchronized pairs of atomic cooling haloes. Monthly Notices of the Royal Astronomical
    Society. 445(1), 1056–1063.
  mla: Visbal, Eli, et al. “Direct Collapse Black Hole Formation from Synchronized
    Pairs of Atomic Cooling Haloes.” <i>Monthly Notices of the Royal Astronomical
    Society</i>, vol. 445, no. 1, Oxford University Press, 2014, pp. 1056–63, doi:<a
    href="https://doi.org/10.1093/mnras/stu1794">10.1093/mnras/stu1794</a>.
  short: E. Visbal, Z. Haiman, G.L. Bryan, Monthly Notices of the Royal Astronomical
    Society 445 (2014) 1056–1063.
date_created: 2024-09-06T07:28:59Z
date_published: 2014-10-08T00:00:00Z
date_updated: 2024-09-24T13:02:31Z
day: '08'
doi: 10.1093/mnras/stu1794
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/stu1794
intvolume: '       445'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1093/mnras/stu1794
month: '10'
oa: 1
oa_version: Published Version
page: 1056-1063
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 0035-8711
  - 1365-2966
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Direct collapse black hole formation from synchronized pairs of atomic cooling
  haloes
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 445
year: '2014'
...
---
_id: '17624'
abstract:
- lang: eng
  text: 'A near-equal-mass binary black hole (BH) can clear a central cavity in a
    circumbinary accretion disc; however, previous works have revealed accretion streams
    entering this cavity. Here we use 2D hydrodynamical simulations to study the accretion
    streams and their periodic behaviour. In particular, we perform a suite of simulations,
    covering different binary mass ratios q = M2/M1 in the range 0.003 ≤ q ≤ 1. In
    each case, we follow the system for several thousand binary orbits, until it relaxes
    to a stable accretion pattern. We find the following results: (i) the binary is
    efficient in maintaining a low-density cavity. However, the time-averaged mass
    accretion rate into the cavity, through narrow coherent accretion streams, is
    suppressed by at most a factor of a few compared to a disc with a single BH with
    the same mass; (ii) for q ≳ 0.05, the accretion rate is strongly modulated by
    the binary, and depending on the precise value of q, the power spectrum of the
    accretion rate shows either one, two or three distinct periods; and (iii) for
    q ≲ 0.05, the accretion rate becomes steady, with no time variations. Most binaries
    produced in galactic mergers are expected to have q ≳ 0.05. If the luminosity
    of these binaries tracks their accretion rate, then a periodogram of their light
    curve could help in their identification, and to constrain their mass ratio and
    disc properties.'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Daniel J.
  full_name: D'Orazio, Daniel J.
  last_name: D'Orazio
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
- first_name: Andrew
  full_name: MacFadyen, Andrew
  last_name: MacFadyen
citation:
  ama: D’Orazio DJ, Haiman Z, MacFadyen A. Accretion into the central cavity of a
    circumbinary disc. <i>Monthly Notices of the Royal Astronomical Society</i>. 2013;436(4):2997-3020.
    doi:<a href="https://doi.org/10.1093/mnras/stt1787">10.1093/mnras/stt1787</a>
  apa: D’Orazio, D. J., Haiman, Z., &#38; MacFadyen, A. (2013). Accretion into the
    central cavity of a circumbinary disc. <i>Monthly Notices of the Royal Astronomical
    Society</i>. Oxford University Press. <a href="https://doi.org/10.1093/mnras/stt1787">https://doi.org/10.1093/mnras/stt1787</a>
  chicago: D’Orazio, Daniel J., Zoltán Haiman, and Andrew MacFadyen. “Accretion into
    the Central Cavity of a Circumbinary Disc.” <i>Monthly Notices of the Royal Astronomical
    Society</i>. Oxford University Press, 2013. <a href="https://doi.org/10.1093/mnras/stt1787">https://doi.org/10.1093/mnras/stt1787</a>.
  ieee: D. J. D’Orazio, Z. Haiman, and A. MacFadyen, “Accretion into the central cavity
    of a circumbinary disc,” <i>Monthly Notices of the Royal Astronomical Society</i>,
    vol. 436, no. 4. Oxford University Press, pp. 2997–3020, 2013.
  ista: D’Orazio DJ, Haiman Z, MacFadyen A. 2013. Accretion into the central cavity
    of a circumbinary disc. Monthly Notices of the Royal Astronomical Society. 436(4),
    2997–3020.
  mla: D’Orazio, Daniel J., et al. “Accretion into the Central Cavity of a Circumbinary
    Disc.” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 436, no.
    4, Oxford University Press, 2013, pp. 2997–3020, doi:<a href="https://doi.org/10.1093/mnras/stt1787">10.1093/mnras/stt1787</a>.
  short: D.J. D’Orazio, Z. Haiman, A. MacFadyen, Monthly Notices of the Royal Astronomical
    Society 436 (2013) 2997–3020.
date_created: 2024-09-05T13:53:11Z
date_published: 2013-10-18T00:00:00Z
date_updated: 2024-09-24T08:47:58Z
day: '18'
doi: 10.1093/mnras/stt1787
extern: '1'
external_id:
  arxiv:
  - '1210.0536'
fulldoi: https://doi.org/10.1093/mnras/stt1787
intvolume: '       436'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: ' https://doi.org/10.48550/arXiv.1210.0536'
month: '10'
oa: 1
oa_version: Preprint
page: 2997-3020
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 1365-2966
  - 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Accretion into the central cavity of a circumbinary disc
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 436
year: '2013'
...
---
_id: '17646'
abstract:
- lang: eng
  text: Structures in Warm Dark Matter (WDM) models are exponentially suppressed below
    a certain scale, characterized by the dark matter particle mass, mx. Since structures
    form hierarchically, the presence of collapsed objects at high-redshifts can set
    strong lower limits on mx. We place robust constraints on mx using recent results
    from the {\it Swift} database of high-redshift gamma-ray bursts (GRBs). We parameterize
    the redshift evolution of the ratio between the cosmic GRB rate and star formation
    rate (SFR) as ∝(1+z)α, thereby allowing astrophysical uncertainties to partially
    mimic the cosmological suppression of structures in WDM models. Using a maximum
    likelihood estimator on two different z>4 GRB subsamples (including two bursts
    at z>8), we constrain mx≳1.6-1.8 keV at 95% C.L., when marginalized over a flat
    prior in α. We further estimate that 5 years of a SVOM-like mission would tighten
    these constraints to mx≳2.3 keV. Our results show that GRBs are a powerful probe
    of high-redshift structures, providing robust and competitive constraints on mx.
article_processing_charge: No
article_type: original
author:
- first_name: R. S.
  full_name: de Souza, R. S.
  last_name: de Souza
- first_name: A.
  full_name: Mesinger, A.
  last_name: Mesinger
- first_name: A.
  full_name: Ferrara, A.
  last_name: Ferrara
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
- first_name: R.
  full_name: Perna, R.
  last_name: Perna
- first_name: N.
  full_name: Yoshida, N.
  last_name: Yoshida
citation:
  ama: de Souza RS, Mesinger A, Ferrara A, Haiman Z, Perna R, Yoshida N. Constraints
    on warm dark matter models from high-redshift long gamma-ray bursts. <i>Monthly
    Notices of the Royal Astronomical Society</i>. 2013;432(4):3218-3227. doi:<a href="https://doi.org/10.1093/mnras/stt674">10.1093/mnras/stt674</a>
  apa: de Souza, R. S., Mesinger, A., Ferrara, A., Haiman, Z., Perna, R., &#38; Yoshida,
    N. (2013). Constraints on warm dark matter models from high-redshift long gamma-ray
    bursts. <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University
    Press. <a href="https://doi.org/10.1093/mnras/stt674">https://doi.org/10.1093/mnras/stt674</a>
  chicago: Souza, R. S. de, A. Mesinger, A. Ferrara, Zoltán Haiman, R. Perna, and
    N. Yoshida. “Constraints on Warm Dark Matter Models from High-Redshift Long Gamma-Ray
    Bursts.” <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University
    Press, 2013. <a href="https://doi.org/10.1093/mnras/stt674">https://doi.org/10.1093/mnras/stt674</a>.
  ieee: R. S. de Souza, A. Mesinger, A. Ferrara, Z. Haiman, R. Perna, and N. Yoshida,
    “Constraints on warm dark matter models from high-redshift long gamma-ray bursts,”
    <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 432, no. 4. Oxford
    University Press, pp. 3218–3227, 2013.
  ista: de Souza RS, Mesinger A, Ferrara A, Haiman Z, Perna R, Yoshida N. 2013. Constraints
    on warm dark matter models from high-redshift long gamma-ray bursts. Monthly Notices
    of the Royal Astronomical Society. 432(4), 3218–3227.
  mla: de Souza, R. S., et al. “Constraints on Warm Dark Matter Models from High-Redshift
    Long Gamma-Ray Bursts.” <i>Monthly Notices of the Royal Astronomical Society</i>,
    vol. 432, no. 4, Oxford University Press, 2013, pp. 3218–27, doi:<a href="https://doi.org/10.1093/mnras/stt674">10.1093/mnras/stt674</a>.
  short: R.S. de Souza, A. Mesinger, A. Ferrara, Z. Haiman, R. Perna, N. Yoshida,
    Monthly Notices of the Royal Astronomical Society 432 (2013) 3218–3227.
date_created: 2024-09-06T07:25:13Z
date_published: 2013-05-09T00:00:00Z
date_updated: 2024-09-24T12:40:52Z
day: '09'
doi: 10.1093/mnras/stt674
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/stt674
intvolume: '       432'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1093/mnras/stt674
month: '05'
oa: 1
oa_version: Published Version
page: 3218-3227
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 0035-8711
  - 1365-2966
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Constraints on warm dark matter models from high-redshift long gamma-ray bursts
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 432
year: '2013'
...
---
_id: '17653'
abstract:
- lang: eng
  text: Observations of quasars at redshifts z > 6 reveal that 10^9 Msol supermassive
    black holes (SMBHs) had already formed when the Universe was < 0.9 Gyr old. One
    hypothesis for the origins of these SMBHs is that they grew from the remnants
    of the first generation of massive stars, which formed in low-mass (~ 10^5 to
    10^6 Msol) dark matter minihaloes at z > 20. This is the regime where baryonic
    streaming motions--the relative velocities of baryons with respect to dark matter
    in the early Universe--most strongly inhibit star formation by suppressing gas
    infall and cooling. We investigate the impact of this effect on the growth of
    the first SMBHs using a suite of high-fidelity, ellipsoidal-collapse Monte Carlo
    merger-tree simulations. We find that the suppression of seed BH formation by
    the streaming motions significantly reduces the number density of the most massive
    BHs at z > 15, but the residual effect at lower redshifts is essentially negligible.
    The streaming motions can reduce by a factor of few the number density of the
    most luminous quasars at z ~ 10-11, where such objects could be detected by the
    James Webb Space Telescope. We conclude, with minor theoretical caveats, that
    baryonic streaming motions are unlikely to pose a significant additional obstacle
    to the formation of the observed high-redshift quasar SMBHs. Nor do they appreciably
    affect the heating and reionization histories of the Universe or the merger rates
    of nuclear BHs in the mass and redshift ranges of interest for proposed gravitational-wave
    detectors.
article_processing_charge: No
article_type: original
author:
- first_name: Takamitsu L.
  full_name: Tanaka, Takamitsu L.
  last_name: Tanaka
- first_name: Miao
  full_name: Li, Miao
  last_name: Li
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
citation:
  ama: Tanaka TL, Li M, Haiman Z. The effect of baryonic streaming motions on the
    formation of the first supermassive black holes. <i>Monthly Notices of the Royal
    Astronomical Society</i>. 2013;435(4):3559-3567. doi:<a href="https://doi.org/10.1093/mnras/stt1553">10.1093/mnras/stt1553</a>
  apa: Tanaka, T. L., Li, M., &#38; Haiman, Z. (2013). The effect of baryonic streaming
    motions on the formation of the first supermassive black holes. <i>Monthly Notices
    of the Royal Astronomical Society</i>. Oxford University Press. <a href="https://doi.org/10.1093/mnras/stt1553">https://doi.org/10.1093/mnras/stt1553</a>
  chicago: Tanaka, Takamitsu L., Miao Li, and Zoltán Haiman. “The Effect of Baryonic
    Streaming Motions on the Formation of the First Supermassive Black Holes.” <i>Monthly
    Notices of the Royal Astronomical Society</i>. Oxford University Press, 2013.
    <a href="https://doi.org/10.1093/mnras/stt1553">https://doi.org/10.1093/mnras/stt1553</a>.
  ieee: T. L. Tanaka, M. Li, and Z. Haiman, “The effect of baryonic streaming motions
    on the formation of the first supermassive black holes,” <i>Monthly Notices of
    the Royal Astronomical Society</i>, vol. 435, no. 4. Oxford University Press,
    pp. 3559–3567, 2013.
  ista: Tanaka TL, Li M, Haiman Z. 2013. The effect of baryonic streaming motions
    on the formation of the first supermassive black holes. Monthly Notices of the
    Royal Astronomical Society. 435(4), 3559–3567.
  mla: Tanaka, Takamitsu L., et al. “The Effect of Baryonic Streaming Motions on the
    Formation of the First Supermassive Black Holes.” <i>Monthly Notices of the Royal
    Astronomical Society</i>, vol. 435, no. 4, Oxford University Press, 2013, pp.
    3559–67, doi:<a href="https://doi.org/10.1093/mnras/stt1553">10.1093/mnras/stt1553</a>.
  short: T.L. Tanaka, M. Li, Z. Haiman, Monthly Notices of the Royal Astronomical
    Society 435 (2013) 3559–3567.
date_created: 2024-09-06T07:31:32Z
date_published: 2013-09-10T00:00:00Z
date_updated: 2024-09-24T13:26:36Z
day: '10'
doi: 10.1093/mnras/stt1553
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/stt1553
intvolume: '       435'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1093/mnras/stt1553
month: '09'
oa: 1
oa_version: Published Version
page: 3559-3567
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 1365-2966
  - 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: The effect of baryonic streaming motions on the formation of the first supermassive
  black holes
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 435
year: '2013'
...
---
_id: '17683'
abstract:
- lang: eng
  text: When a sufficiently massive satellite (or secondary) black hole is embedded
    in a gas disc around a (primary) supermassive black hole, it can open an empty
    gap in the disc. A gap-opening secondary close to the primary will leave an imprint
    in the broad component of the Fe Kα emission line, which varies in a unique and
    predictable manner. If the gap persists into the innermost disc, the effect consists
    of a pair of dips in the broad line which ripple blue-ward and red-ward from the
    line centroid energy, respectively, as the gap moves closer to the primary. This
    ripple effect could be unambiguously detectable and allow an electromagnetic monitoring
    of massive black hole mergers as they occur. As the mass ratio of the secondary
    to primary black hole increases to q ≳ 0.01, we expect the gap to widen, possibly
    clearing a central cavity in the inner disc, which shows up in the broad Fe Kα
    line component. If the secondary stalls at ≥ 102rg in its in-migration, due to
    low corotating gas mass, a detectable ripple effect occurs in the broad line component
    on the disc viscous time-scale as the inner disc drains and the outer disc is
    dammed. If the secondary maintains an accretion disc within a central cavity,
    due to dam bursting or leakage, a periodic ‘see-saw’ oscillation effect is exhibited
    in the observed line profile. Here, we demonstrate the range of ripple effect
    signatures potentially detectable with Astro-H and IXO/Athena, and oscillation
    effects potentially detectable with XMM–Newton or LOFT for a wide variety of merger
    and disc conditions, including gap width (or cavity size), disc inclination angle
    and emissivity profile, damming of the accretion flow by the secondary, and a
    minidisc around the satellite black hole. A systematic study of ripple effects
    would require a telescope effective area substantially larger than that planned
    for IXO/Athena. Future mission planning should take this into account. Observations
    of the ripple effect and periodic oscillations can be used to provide an early
    warning of gravitational radiation emission from the AGN. Once gravitational waves
    consistent with massive black hole mergers are detected, an archival search for
    the Fe Kα ripple effect or periodic oscillations will help in localizing their
    origin.
article_processing_charge: No
article_type: original
author:
- first_name: B.
  full_name: McKernan, B.
  last_name: McKernan
- first_name: K. E. S.
  full_name: Ford, K. E. S.
  last_name: Ford
- first_name: B.
  full_name: Kocsis, B.
  last_name: Kocsis
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
citation:
  ama: McKernan B, Ford KES, Kocsis B, Haiman Z. Ripple effects and oscillations in
    the broad Fe Kα line as a probe of massive black hole mergers. <i>Monthly Notices
    of the Royal Astronomical Society</i>. 2013;432(2):1468-1482. doi:<a href="https://doi.org/10.1093/mnras/stt567">10.1093/mnras/stt567</a>
  apa: McKernan, B., Ford, K. E. S., Kocsis, B., &#38; Haiman, Z. (2013). Ripple effects
    and oscillations in the broad Fe Kα line as a probe of massive black hole mergers.
    <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press.
    <a href="https://doi.org/10.1093/mnras/stt567">https://doi.org/10.1093/mnras/stt567</a>
  chicago: McKernan, B., K. E. S. Ford, B. Kocsis, and Zoltán Haiman. “Ripple Effects
    and Oscillations in the Broad Fe Kα Line as a Probe of Massive Black Hole Mergers.”
    <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press,
    2013. <a href="https://doi.org/10.1093/mnras/stt567">https://doi.org/10.1093/mnras/stt567</a>.
  ieee: B. McKernan, K. E. S. Ford, B. Kocsis, and Z. Haiman, “Ripple effects and
    oscillations in the broad Fe Kα line as a probe of massive black hole mergers,”
    <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 432, no. 2. Oxford
    University Press, pp. 1468–1482, 2013.
  ista: McKernan B, Ford KES, Kocsis B, Haiman Z. 2013. Ripple effects and oscillations
    in the broad Fe Kα line as a probe of massive black hole mergers. Monthly Notices
    of the Royal Astronomical Society. 432(2), 1468–1482.
  mla: McKernan, B., et al. “Ripple Effects and Oscillations in the Broad Fe Kα Line
    as a Probe of Massive Black Hole Mergers.” <i>Monthly Notices of the Royal Astronomical
    Society</i>, vol. 432, no. 2, Oxford University Press, 2013, pp. 1468–82, doi:<a
    href="https://doi.org/10.1093/mnras/stt567">10.1093/mnras/stt567</a>.
  short: B. McKernan, K.E.S. Ford, B. Kocsis, Z. Haiman, Monthly Notices of the Royal
    Astronomical Society 432 (2013) 1468–1482.
date_created: 2024-09-06T08:18:32Z
date_published: 2013-05-02T00:00:00Z
date_updated: 2024-09-25T09:13:00Z
day: '02'
doi: 10.1093/mnras/stt567
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/stt567
intvolume: '       432'
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1093/mnras/stt567
month: '05'
oa: 1
oa_version: Published Version
page: 1468-1482
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 0035-8711
  - 1365-2966
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Ripple effects and oscillations in the broad Fe Kα line as a probe of massive
  black hole mergers
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 432
year: '2013'
...
---
_id: '17684'
abstract:
- lang: eng
  text: We have performed cosmo-hydro simulations using the RAMSES code to study atomic
    cooling (ACHs) haloes at z=10 with masses 5E7Msun<~M<~2E9Msun. We assume primordial
    gas and H2-cooling and prior star-formation have been suppressed. We analysed
    19 haloes (gas and DM) at a resolution of ~10 (proper) pc, selected from a total
    volume of ~2E3 (comoving) Mpc3. This is the largest statistical hydro-sim. study
    of ACHs at z>10 to date. We examine the morphology, angular momentum (AM), thermodynamic,
    and turbulence of these haloes, in order to assess the prevalence of disks and
    supermassive black holes (SMBHs). We find no correlation between either the magnitude
    or the direction of the AM of the gas and its parent DM halo. Only 3 haloes form
    rotationally supported cores. Two of the most massive haloes form massive, compact
    overdense blobs. These blobs have an accretion rate ~0.5 Msun/yr (at a distance
    of 100 pc), and are possible sites of SMBH formation. Our results suggest that
    the degree of rotational support and the fate of the gas in a halo is determined
    by its large-scale environment and merger history. In particular, the two haloes
    forming blobs are located at knots of the cosmic web, cooled early on, and experienced
    many mergers. The gas in these haloes is lumpy and highly turbulent, with Mach
    N. >~ 5. In contrast, the haloes forming rotationally supported cores are relatively
    more isolated, located midway along filaments, cooled more recently, and underwent
    fewer mergers. Thus, the gas in these haloes is less lumpy and less turbulent
    (Mach <~ 4), and could retain most of its AM. The remaining 14 haloes have intermediate
    properties. If verified in a larger sample of haloes and with additional physics,
    our results will have implications for observations of the highest-redshift galaxies
    and quasars with JWST.
article_processing_charge: No
article_type: original
author:
- first_name: Joaquin
  full_name: Prieto, Joaquin
  last_name: Prieto
- first_name: Raul
  full_name: Jimenez, Raul
  last_name: Jimenez
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
citation:
  ama: 'Prieto J, Jimenez R, Haiman Z. Gas infall into atomic cooling haloes: On the
    formation of protogalactic discs and supermassive black holes at z &#62; 10. <i>Monthly
    Notices of the Royal Astronomical Society</i>. 2013;436(3):2301-2325. doi:<a href="https://doi.org/10.1093/mnras/stt1730">10.1093/mnras/stt1730</a>'
  apa: 'Prieto, J., Jimenez, R., &#38; Haiman, Z. (2013). Gas infall into atomic cooling
    haloes: On the formation of protogalactic discs and supermassive black holes at
    z &#62; 10. <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University
    Press. <a href="https://doi.org/10.1093/mnras/stt1730">https://doi.org/10.1093/mnras/stt1730</a>'
  chicago: 'Prieto, Joaquin, Raul Jimenez, and Zoltán Haiman. “Gas Infall into Atomic
    Cooling Haloes: On the Formation of Protogalactic Discs and Supermassive Black
    Holes at z &#62; 10.” <i>Monthly Notices of the Royal Astronomical Society</i>.
    Oxford University Press, 2013. <a href="https://doi.org/10.1093/mnras/stt1730">https://doi.org/10.1093/mnras/stt1730</a>.'
  ieee: 'J. Prieto, R. Jimenez, and Z. Haiman, “Gas infall into atomic cooling haloes:
    On the formation of protogalactic discs and supermassive black holes at z &#62;
    10,” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 436, no. 3.
    Oxford University Press, pp. 2301–2325, 2013.'
  ista: 'Prieto J, Jimenez R, Haiman Z. 2013. Gas infall into atomic cooling haloes:
    On the formation of protogalactic discs and supermassive black holes at z &#62;
    10. Monthly Notices of the Royal Astronomical Society. 436(3), 2301–2325.'
  mla: 'Prieto, Joaquin, et al. “Gas Infall into Atomic Cooling Haloes: On the Formation
    of Protogalactic Discs and Supermassive Black Holes at z &#62; 10.” <i>Monthly
    Notices of the Royal Astronomical Society</i>, vol. 436, no. 3, Oxford University
    Press, 2013, pp. 2301–25, doi:<a href="https://doi.org/10.1093/mnras/stt1730">10.1093/mnras/stt1730</a>.'
  short: J. Prieto, R. Jimenez, Z. Haiman, Monthly Notices of the Royal Astronomical
    Society 436 (2013) 2301–2325.
date_created: 2024-09-06T08:19:41Z
date_published: 2013-10-08T00:00:00Z
date_updated: 2024-09-25T09:15:36Z
day: '08'
doi: 10.1093/mnras/stt1730
extern: '1'
fulldoi: https://doi.org/10.1093/mnras/stt1730
intvolume: '       436'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1093/mnras/stt1730
month: '10'
oa: 1
oa_version: Published Version
page: 2301-2325
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 1365-2966
  - 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Gas infall into atomic cooling haloes: On the formation of protogalactic discs
  and supermassive black holes at z > 10'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 436
year: '2013'
...
---
_id: '17613'
abstract:
- lang: eng
  text: We study the interaction of a supermassive black hole (SMBH) binary and a
    standard radiatively efficient thin accretion disk. We examine steady-state configurations
    of the disk and migrating SMBH system, self-consistently accounting for tidal
    and viscous torques and heating, radiative diffusion limited cooling, gas and
    radiation pressure, and the decay of the binary's orbit. We obtain a "phase diagram"
    of the system as a function of binary parameters, showing regimes in which both
    the disk structure and migration have a different character. Although massive
    binaries can create a central gap in the disk at large radii, the tidal barrier
    of the secondary causes a significant pile-up of gas outside of its orbit, which
    can lead to the closing of the gap. We find that this spillover occurs at an orbital
    separation as large as ~200 M_7^{-1/2} gravitational radii, where M = 10^7 M_7
    Msun is the total binary mass. If the secondary is less massive than ~10^6 Msun,
    then the gap is closed before gravitational waves (GWs) start dominating the orbital
    decay. In this regime, the disk is still strongly perturbed, but the piled-up
    gas continuously overflows as in a porous dam, and crosses inside the secondary's
    orbit. The corresponding migration rate, which we label Type 1.5, is slower than
    the usual limiting cases known as Type I and II migration. Compared to an unperturbed
    disk, the steady-state disk in the overflowing regime is up to several hundred
    times brighter in the optical bands. Surveys such as PanSTARRS or LSST may discover
    the periodic variability of this population of binaries. Our results imply that
    the circumbinary disks around SMBHs can extend to small radii during the last
    stages of their merger, when they are detectable by LISA, and may produce coincident
    electromagnetic (EM) emission similar to active galactic nuclei (AGN).
alternative_title:
- 'Overflow and migration: SMBH binaries'
article_processing_charge: No
article_type: original
author:
- first_name: Bence
  full_name: Kocsis, Bence
  last_name: Kocsis
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
- first_name: Abraham
  full_name: Loeb, Abraham
  last_name: Loeb
citation:
  ama: 'Kocsis B, Haiman Z, Loeb A. Gas pile-up, gap overflow and Type 1.5 migration
    in circumbinary discs: Application to supermassive black hole binaries. <i>Monthly
    Notices of the Royal Astronomical Society</i>. 2012;427(3):2680-2700. doi:<a href="https://doi.org/10.1111/j.1365-2966.2012.22118.x">10.1111/j.1365-2966.2012.22118.x</a>'
  apa: 'Kocsis, B., Haiman, Z., &#38; Loeb, A. (2012). Gas pile-up, gap overflow and
    Type 1.5 migration in circumbinary discs: Application to supermassive black hole
    binaries. <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University
    Press. <a href="https://doi.org/10.1111/j.1365-2966.2012.22118.x">https://doi.org/10.1111/j.1365-2966.2012.22118.x</a>'
  chicago: 'Kocsis, Bence, Zoltán Haiman, and Abraham Loeb. “Gas Pile-up, Gap Overflow
    and Type 1.5 Migration in Circumbinary Discs: Application to Supermassive Black
    Hole Binaries.” <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford
    University Press, 2012. <a href="https://doi.org/10.1111/j.1365-2966.2012.22118.x">https://doi.org/10.1111/j.1365-2966.2012.22118.x</a>.'
  ieee: 'B. Kocsis, Z. Haiman, and A. Loeb, “Gas pile-up, gap overflow and Type 1.5
    migration in circumbinary discs: Application to supermassive black hole binaries,”
    <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 427, no. 3. Oxford
    University Press, pp. 2680–2700, 2012.'
  ista: 'Kocsis B, Haiman Z, Loeb A. 2012. Gas pile-up, gap overflow and Type 1.5
    migration in circumbinary discs: Application to supermassive black hole binaries.
    Monthly Notices of the Royal Astronomical Society. 427(3), 2680–2700.'
  mla: 'Kocsis, Bence, et al. “Gas Pile-up, Gap Overflow and Type 1.5 Migration in
    Circumbinary Discs: Application to Supermassive Black Hole Binaries.” <i>Monthly
    Notices of the Royal Astronomical Society</i>, vol. 427, no. 3, Oxford University
    Press, 2012, pp. 2680–700, doi:<a href="https://doi.org/10.1111/j.1365-2966.2012.22118.x">10.1111/j.1365-2966.2012.22118.x</a>.'
  short: B. Kocsis, Z. Haiman, A. Loeb, Monthly Notices of the Royal Astronomical
    Society 427 (2012) 2680–2700.
date_created: 2024-09-05T13:28:17Z
date_published: 2012-12-11T00:00:00Z
date_updated: 2024-09-24T07:40:02Z
day: '11'
doi: 10.1111/j.1365-2966.2012.22118.x
extern: '1'
fulldoi: https://doi.org/10.1111/j.1365-2966.2012.22118.x
intvolume: '       427'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1111/j.1365-2966.2012.22118.x
month: '12'
oa: 1
oa_version: Published Version
page: 2680-2700
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 0035-8711
  - 1365-2966
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Gas pile-up, gap overflow and Type 1.5 migration in circumbinary discs: Application
  to supermassive black hole binaries'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 427
year: '2012'
...
---
_id: '17660'
abstract:
- lang: eng
  text: Many astrophysical binaries, from planets to black holes, exert strong torques
    on their circumbinary accretion discs, and are expected to significantly modify
    the disc structure. Despite the several decade long history of the subject, the
    joint evolution of the binary + disc system has not been modelled with self-consistent
    assumptions for arbitrary mass ratios and accretion rates. Here, we solve the
    coupled binary–disc evolution equations analytically in the strongly perturbed
    limit, treating the azimuthally averaged angular momentum exchange between the
    disc and the binary and the modifications to the density, scaleheight, and viscosity
    self-consistently, including viscous and tidal heating, diffusion limited cooling,
    radiation pressure and the orbital decay of the binary. We find a solution with
    a central cavity and a migration rate similar to those previously obtained for
    Type II migration, applicable for large masses and binary separations, and near-equal
    mass ratios. However, we identify a distinct new regime, applicable at smaller
    separations and masses, and mass ratio in the range 10−3 ≲ q ≲ 0.1. For these
    systems, gas piles up outside the binary's orbit, but rather than creating a cavity,
    it continuously overflows as in a porous dam. The disc profile is intermediate
    between a weakly perturbed disc (producing Type I migration) and a disc with a
    gap (with Type II migration). However, the migration rate of the secondary is
    typically slower than both Type I and Type II rates. We term this new regime ‘Type
    1.5’ migration.
alternative_title:
- 'Overflow and migration: general theory'
article_processing_charge: No
article_type: original
author:
- first_name: Bence
  full_name: Kocsis, Bence
  last_name: Kocsis
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
- first_name: Abraham
  full_name: Loeb, Abraham
  last_name: Loeb
citation:
  ama: 'Kocsis B, Haiman Z, Loeb A. Gas pile-up, gap overflow and Type 1.5 migration
    in circumbinary discs: General theory. <i>Monthly Notices of the Royal Astronomical
    Society</i>. 2012;427(3):2660-2679. doi:<a href="https://doi.org/10.1111/j.1365-2966.2012.22129.x">10.1111/j.1365-2966.2012.22129.x</a>'
  apa: 'Kocsis, B., Haiman, Z., &#38; Loeb, A. (2012). Gas pile-up, gap overflow and
    Type 1.5 migration in circumbinary discs: General theory. <i>Monthly Notices of
    the Royal Astronomical Society</i>. Oxford University Press. <a href="https://doi.org/10.1111/j.1365-2966.2012.22129.x">https://doi.org/10.1111/j.1365-2966.2012.22129.x</a>'
  chicago: 'Kocsis, Bence, Zoltán Haiman, and Abraham Loeb. “Gas Pile-up, Gap Overflow
    and Type 1.5 Migration in Circumbinary Discs: General Theory.” <i>Monthly Notices
    of the Royal Astronomical Society</i>. Oxford University Press, 2012. <a href="https://doi.org/10.1111/j.1365-2966.2012.22129.x">https://doi.org/10.1111/j.1365-2966.2012.22129.x</a>.'
  ieee: 'B. Kocsis, Z. Haiman, and A. Loeb, “Gas pile-up, gap overflow and Type 1.5
    migration in circumbinary discs: General theory,” <i>Monthly Notices of the Royal
    Astronomical Society</i>, vol. 427, no. 3. Oxford University Press, pp. 2660–2679,
    2012.'
  ista: 'Kocsis B, Haiman Z, Loeb A. 2012. Gas pile-up, gap overflow and Type 1.5
    migration in circumbinary discs: General theory. Monthly Notices of the Royal
    Astronomical Society. 427(3), 2660–2679.'
  mla: 'Kocsis, Bence, et al. “Gas Pile-up, Gap Overflow and Type 1.5 Migration in
    Circumbinary Discs: General Theory.” <i>Monthly Notices of the Royal Astronomical
    Society</i>, vol. 427, no. 3, Oxford University Press, 2012, pp. 2660–79, doi:<a
    href="https://doi.org/10.1111/j.1365-2966.2012.22129.x">10.1111/j.1365-2966.2012.22129.x</a>.'
  short: B. Kocsis, Z. Haiman, A. Loeb, Monthly Notices of the Royal Astronomical
    Society 427 (2012) 2660–2679.
date_created: 2024-09-06T07:38:16Z
date_published: 2012-12-11T00:00:00Z
date_updated: 2024-09-25T07:21:05Z
day: '11'
doi: 10.1111/j.1365-2966.2012.22129.x
extern: '1'
fulldoi: https://doi.org/10.1111/j.1365-2966.2012.22129.x
intvolume: '       427'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1111/j.1365-2966.2012.22129.x
month: '12'
oa: 1
oa_version: Published Version
page: 2660-2679
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 0035-8711
  - 1365-2966
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Gas pile-up, gap overflow and Type 1.5 migration in circumbinary discs: General
  theory'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 427
year: '2012'
...
---
_id: '17674'
abstract:
- lang: eng
  text: The power spectrum of cosmic infrared background (CIB) anisotropies is sensitive
    to the connection between star formation and dark matter haloes over the entire
    cosmic star formation history. Here we develop a model that associates star‐forming
    galaxies with dark matter haloes and their subhaloes. The model is based on a
    parametrized relation between the dust‐processed infrared luminosity and (sub)halo
    mass. By adjusting three free parameters, we attempt to simultaneously fit the
    four frequency bands of the Planck measurement of the CIB anisotropy power spectrum.
    To fit the data, we find that the star formation efficiency must peak on a halo
    mass scale of ≈5 × 10^12 M⊙ and the infrared luminosity per unit mass must increase
    rapidly with redshift. By comparing our predictions with a well‐calibrated phenomenological
    model for shot noise, and with a direct observation of source counts, we show
    that the mean duty cycle of the underlying infrared sources must be near unity,
    indicating that the CIB is dominated by long‐lived quiescent star formation, rather
    than intermittent short ‘starbursts’. Despite the improved flexibility of our
    model, the best simultaneous fit to all four Planck channels remains relatively
    poor. We discuss possible further extensions to alleviate the remaining tension
    with the data. Our model presents a theoretical framework for a future joint analysis
    of both background anisotropy and source count measurements.
alternative_title:
- Improved models for CIB anisotropies
article_processing_charge: No
article_type: original
author:
- first_name: Cien
  full_name: Shang, Cien
  last_name: Shang
- first_name: Zoltán
  full_name: Haiman, Zoltán
  id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
  last_name: Haiman
- first_name: Lloyd
  full_name: Knox, Lloyd
  last_name: Knox
- first_name: S. Peng
  full_name: Oh, S. Peng
  last_name: Oh
citation:
  ama: 'Shang C, Haiman Z, Knox L, Oh SP. Improved models for cosmic infrared background
    anisotropies: New constraints on the infrared galaxy population. <i>Monthly Notices
    of the Royal Astronomical Society</i>. 2012;421(4):2832-2845. doi:<a href="https://doi.org/10.1111/j.1365-2966.2012.20510.x">10.1111/j.1365-2966.2012.20510.x</a>'
  apa: 'Shang, C., Haiman, Z., Knox, L., &#38; Oh, S. P. (2012). Improved models for
    cosmic infrared background anisotropies: New constraints on the infrared galaxy
    population. <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University
    Press. <a href="https://doi.org/10.1111/j.1365-2966.2012.20510.x">https://doi.org/10.1111/j.1365-2966.2012.20510.x</a>'
  chicago: 'Shang, Cien, Zoltán Haiman, Lloyd Knox, and S. Peng Oh. “Improved Models
    for Cosmic Infrared Background Anisotropies: New Constraints on the Infrared Galaxy
    Population.” <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford
    University Press, 2012. <a href="https://doi.org/10.1111/j.1365-2966.2012.20510.x">https://doi.org/10.1111/j.1365-2966.2012.20510.x</a>.'
  ieee: 'C. Shang, Z. Haiman, L. Knox, and S. P. Oh, “Improved models for cosmic infrared
    background anisotropies: New constraints on the infrared galaxy population,” <i>Monthly
    Notices of the Royal Astronomical Society</i>, vol. 421, no. 4. Oxford University
    Press, pp. 2832–2845, 2012.'
  ista: 'Shang C, Haiman Z, Knox L, Oh SP. 2012. Improved models for cosmic infrared
    background anisotropies: New constraints on the infrared galaxy population. Monthly
    Notices of the Royal Astronomical Society. 421(4), 2832–2845.'
  mla: 'Shang, Cien, et al. “Improved Models for Cosmic Infrared Background Anisotropies:
    New Constraints on the Infrared Galaxy Population.” <i>Monthly Notices of the
    Royal Astronomical Society</i>, vol. 421, no. 4, Oxford University Press, 2012,
    pp. 2832–45, doi:<a href="https://doi.org/10.1111/j.1365-2966.2012.20510.x">10.1111/j.1365-2966.2012.20510.x</a>.'
  short: C. Shang, Z. Haiman, L. Knox, S.P. Oh, Monthly Notices of the Royal Astronomical
    Society 421 (2012) 2832–2845.
date_created: 2024-09-06T07:50:37Z
date_published: 2012-04-10T00:00:00Z
date_updated: 2024-09-25T08:36:17Z
day: '10'
doi: 10.1111/j.1365-2966.2012.20510.x
extern: '1'
fulldoi: https://doi.org/10.1111/j.1365-2966.2012.20510.x
intvolume: '       421'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1111/j.1365-2966.2012.20510.x
month: '04'
oa: 1
oa_version: Published Version
page: 2832-2845
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
  issn:
  - 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Improved models for cosmic infrared background anisotropies: New constraints
  on the infrared galaxy population'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 421
year: '2012'
...
