---
res:
  bibo_abstract:
  - 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@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Ricardo
      foaf_name: Fernandez, Ricardo
      foaf_surname: Fernandez
  - foaf_Person:
      foaf_givenName: Greg L.
      foaf_name: Bryan, Greg L.
      foaf_surname: Bryan
  - foaf_Person:
      foaf_givenName: Zoltán
      foaf_name: Haiman, Zoltán
      foaf_surname: Haiman
      foaf_workInfoHomepage: http://www.librecat.org/personId=7c006e8c-cc0d-11ee-8322-cb904ef76f36
  - foaf_Person:
      foaf_givenName: Miao
      foaf_name: Li, Miao
      foaf_surname: Li
  bibo_doi: 10.1093/mnras/stu230
  bibo_issue: '4'
  bibo_volume: 439
  dct_date: 2014^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/1365-2966
  - http://id.crossref.org/issn/0035-8711
  dct_language: eng
  dct_publisher: Oxford University Press@
  dct_title: 'H2 suppression with shocking inflows: Testing a pathway for supermassive
    black hole formation@'
...