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dc.contributor.author
Goovaerts, I.
dc.contributor.author
Pello, R.
dc.contributor.author
Thai, T.T.
dc.contributor.author
Tuan-Anh, P.
dc.contributor.author
Richard, J.
dc.contributor.author
Claeyssens, A.
dc.contributor.author
Carinos, E.
dc.contributor.author
De La Vieuville, G.
dc.contributor.author
Matthee, J.
dc.date.accessioned
2023-11-20T16:02:26Z
dc.date.available
2023-11-16T04:51:32Z
dc.date.available
2023-11-20T16:02:26Z
dc.date.issued
2023-10
dc.identifier.issn
0004-6361
dc.identifier.issn
1432-0746
dc.identifier.other
10.1051/0004-6361/202347110
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/642281
dc.identifier.doi
10.3929/ethz-b-000642281
dc.description.abstract
Context: Faint galaxies are theorised to have played a major role, perhaps the dominant role, in reionising the Universe. Their properties, as well as the Lyman-α emitter (LAE) fraction, XLAE, could provide useful insights into this epoch. Aims: We used four clusters of galaxies from the Lensed Lyman-alpha MUSE Arcs Sample (LLAMAS) that also have deep HST photometry to select a population of intrinsically faint Lyman break galaxies (LBGs) and LAEs. We study the interrelation between these two populations, their properties, and the fraction of LBGs that display Lyman-α emission. Methods: The use of lensing clusters allows us to access an intrinsically faint population of galaxies, the largest such sample collected for this purpose: 263 LAEs and 972 LBGs with redshifts between 2.9 and 6.7, Lyman-α luminosities in the range 39.5 ≲ log(LLyα)(erg s⁻¹) ≲ 42, and absolute UV magnitudes in the range −22 ≲ M1500 ≲ −12. In addition to matching LAEs and LBGs, we define an LAE+continuum sample for the LAEs that match with a continuum object that is not selected as an LBG. Additionally, with the use of MUSE integral field spectroscopy, we detect a population of LAEs completely undetected in the continuum. Results: We find a redshift evolution of XLAE in line with literature results, with diminished values above z = 6. In line with past studies, we take this as signifying an increasingly neutral intervening intergalactic medium. When inspecting this redshift evolution with different limits on EWLyα and M₁₅₀₀, we find that the XLAE for the UV-brighter half of our sample is higher than the XLAE for the UV-fainter half, a difference that increases at higher redshifts. This is a surprising result and can be interpreted as the presence of a population of low Lyman-α equivalent width (EWLyα), UV-bright galaxies situated in reionised bubbles and overdensities. This result is especially interesting in the context of similar, UV-bright, low EWLyα objects recently detected during and around the epoch of reionisation. For intrinsically fainter objects, we confirm the previously observed trend of LAEs among LBGs as galaxies with high star formation rates and low dust content, as well as the trend of the strongest LAEs having, in general, fainter M₁₅₀₀ and steeper UV slopes.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
EDP Sciences
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
gravitational lensing: strong
en_US
dc.subject
galaxies: high-redshift
en_US
dc.subject
dark ages
en_US
dc.subject
reionization
en_US
dc.subject
first stars
en_US
dc.title
Evolution of the Lyman-α-emitting fraction and UV properties of lensed star-forming galaxies in the range 2.9 < z < 6.7
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2023-10-18
ethz.journal.title
Astronomy & Astrophysics
ethz.journal.volume
678
en_US
ethz.journal.abbreviated
Astron. Astrophys.
ethz.pages.start
A174
en_US
ethz.size
13 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.status
published
en_US
ethz.date.deposited
2023-11-16T04:51:34Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2023-11-20T16:02:27Z
ethz.rosetta.lastUpdated
2024-02-03T06:40:20Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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