---
OA_place: publisher
OA_type: diamond
_id: '18493'
abstract:
- lang: eng
text: "Context. The escape of Lyman-α photons at redshifts greater than two is an
ongoing subject of study and an important quantity to further understanding of
Lyman-α emitters (LAEs), the transmission of Lyman-α photons through the interstellar
medium and intergalactic medium, and the impact these LAEs have on cosmic reionisation.\r\n\r\nAims.
This study aims to assess the Lyman-α escape fraction, fesc, Lyα, over the redshift
range 2.9 < z < 6.7, focusing on Very Large Telescope/Multi Unit Spectroscopic
Explorer (VLT/MUSE) selected, gravitationally lensed, intrinsically faint LAEs.
These galaxies are of particular interest as the potential drivers of cosmic reionisation.\r\n\r\nMethods.
We assessed fesc, Lyα in two ways: through an individual study of 96 LAEs behind
the A2744 lensing cluster, with James Webb Space Telescope/Near-Infrared Camera
(JWST/NIRCam) and HST data, and through a study of the global evolution of fesc, Lyα
using the state-of-the-art luminosity functions for LAEs and the UV-selected ‘parent’
population (dust-corrected). We compared these studies to those in the literature
based on brighter samples.\r\n\r\nResults. We find a negligible redshift evolution
of fesc, Lyα for our individual galaxies; it is likely that it was washed out
by significant intrinsic scatter. We observed a more significant evolution towards
higher escape fractions with decreasing UV magnitude and fit this relation. When
comparing the two luminosity functions to derive fesc, Lyα in a global sense,
we saw agreement with previous literature when integrating the luminosity functions
to a bright limit. However, when integrating using a faint limit equivalent to
the observational limits of our samples, we observed enhanced values of fesc, Lyα,
particularly around z ∼ 6, where fesc, Lyα becomes consistent with 100% escape.
This indicates for the faint regimes we sampled that galaxies towards reionisation
tend to allow very large fractions of Lyman-α photons to escape. We interpret
this as evidence of a lack of any significant dust in these populations; our sample
is likely dominated by young, highly star-forming chemically unevolved galaxies.
Finally, we assessed the contribution of the LAE population to reionisation using
our latest values for fesc, Lyα and the LAE luminosity density. The dependence
on the escape fraction of Lyman continuum photons is strong, but for values similar
to those observed recently in z ∼ 3 LAEs and high-redshift analogues, LAEs could
provide all the ionising emissivity necessary for reionisation."
acknowledgement: "This work is done based on observations made with ESO Telescopes
at the La Silla Paranal Observatory under programme IDs 060.A-9345, 092.A-0472,
094.A-0115, 095.A-0181, 096.A-0710, 097.A0269, 100.A-0249, and 294.A-5032. Also
based on observations obtained with the\r\nNASA/ESA Hubble Space Telescope, retrieved
from the Mikulski Archive for Space Telescopes (MAST) at the Space Telescope Science
Institute (STScI). STScI is operated by the Association of Universities for Research
in Astronomy, Inc. under NASA contract NAS 5-26555. All plots in this paper were
created using Matplotlib (Hunter 2007). Part of this work was supported by the French
CNRS, the Aix-Marseille University, the French Programme National de Cosmologie
et Galaxies (PNCG) of CNRS/INSU with INP and IN2P3, co-funded by CEA and CNES. This
work also received support from the French government under the France 2030 investment
plan, as part of the Excellence Initiative of Aix-Marseille University - A*MIDEX
(AMX-19-IET-008 - IPhU).\r\nFinancial support from the World Laboratory, the Odon
Vallet Foundation and VNSC is gratefully acknowledged. Tran Thi Thai was funded
by Vingroup JSC and supported by the Master, PhD Scholarship Programme of Vingroup
Innovation Foundation (VINIF), Institute of Big Data, code VINIF.2023.TS.108. This
research was funded by Vingroup Innovation Foundation under project code VINIF.2023.DA.057."
article_number: A302
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: I.
full_name: Goovaerts, I.
last_name: Goovaerts
- first_name: T. T.
full_name: Thai, T. T.
last_name: Thai
- first_name: R.
full_name: Pello, R.
last_name: Pello
- first_name: P.
full_name: Tuan-Anh, P.
last_name: Tuan-Anh
- first_name: N.
full_name: Laporte, N.
last_name: Laporte
- 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: T.
full_name: Nanayakkara, T.
last_name: Nanayakkara
- first_name: J.
full_name: Pharo, J.
last_name: Pharo
citation:
ama: Goovaerts I, Thai TT, Pello R, et al. Charting the Lyman-α escape fraction
in the range 2.9 < z < 6.7 and consequences for the LAE reionisation contribution.
Astronomy & Astrophysics. 2024;690. doi:10.1051/0004-6361/202451432
apa: Goovaerts, I., Thai, T. T., Pello, R., Tuan-Anh, P., Laporte, N., Matthee,
J. J., … Pharo, J. (2024). Charting the Lyman-α escape fraction in the range 2.9
< z < 6.7 and consequences for the LAE reionisation contribution. Astronomy
& Astrophysics. EDP Sciences. https://doi.org/10.1051/0004-6361/202451432
chicago: Goovaerts, I., T. T. Thai, R. Pello, P. Tuan-Anh, N. Laporte, Jorryt J
Matthee, T. Nanayakkara, and J. Pharo. “Charting the Lyman-α Escape Fraction in
the Range 2.9 < z < 6.7 and Consequences for the LAE Reionisation Contribution.”
Astronomy & Astrophysics. EDP Sciences, 2024. https://doi.org/10.1051/0004-6361/202451432.
ieee: I. Goovaerts et al., “Charting the Lyman-α escape fraction in the range
2.9 < z < 6.7 and consequences for the LAE reionisation contribution,”
Astronomy & Astrophysics, vol. 690. EDP Sciences, 2024.
ista: Goovaerts I, Thai TT, Pello R, Tuan-Anh P, Laporte N, Matthee JJ, Nanayakkara
T, Pharo J. 2024. Charting the Lyman-α escape fraction in the range 2.9 <
z < 6.7 and consequences for the LAE reionisation contribution. Astronomy
& Astrophysics. 690, A302.
mla: Goovaerts, I., et al. “Charting the Lyman-α Escape Fraction in the Range 2.9
< z < 6.7 and Consequences for the LAE Reionisation Contribution.” Astronomy
& Astrophysics, vol. 690, A302, EDP Sciences, 2024, doi:10.1051/0004-6361/202451432.
short: I. Goovaerts, T.T. Thai, R. Pello, P. Tuan-Anh, N. Laporte, J.J. Matthee,
T. Nanayakkara, J. Pharo, Astronomy & Astrophysics 690 (2024).
das_tickbox: '1'
date_created: 2024-11-03T23:01:45Z
date_published: 2024-10-01T00:00:00Z
date_updated: 2026-07-08T06:44:21Z
day: '01'
ddc:
- '520'
department:
- _id: JoMa
doi: 10.1051/0004-6361/202451432
external_id:
arxiv:
- '2408.00517'
isi:
- '001339205700015'
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oa_version: Published Version
publication: Astronomy & Astrophysics
publication_identifier:
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- 1432-0746
issn:
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publisher: EDP Sciences
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title: Charting the Lyman-α escape fraction in the range 2.9 < z < 6.7 and consequences
for the LAE reionisation contribution
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