The VANDELS survey: the ionizing properties of star-forming galaxies at 3 ≤ z ≤ 5 using deep rest-frame ultraviolet spectroscopy

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dc.contributor.authorSaldana-Lopez, A.
dc.contributor.authorSchaerer, D.
dc.contributor.authorChisholm, J.
dc.contributor.authorCalabrò, A.
dc.contributor.authorPentericci, L.
dc.contributor.authorCullen, F.
dc.contributor.authorSaxena, A.
dc.contributor.authorAmorín, R.
dc.contributor.authorCarnall, A.C.
dc.contributor.authorFontanot, F.
dc.contributor.authorFynbo, J.P.U.
dc.contributor.authorGuaita, L.
dc.contributor.authorHathi, N.P.
dc.contributor.authorHibon, P.
dc.contributor.authorJi, Z.
dc.contributor.authorMcLeod, D.J.
dc.contributor.authorPompei, E.
dc.contributor.authorZamorani, G.
dc.date.accessioned2023-11-22T18:07:10Z
dc.date.available2023-11-22T18:07:10Z
dc.date.issued2023-07-01
dc.descriptionINDEXACIÓN: SCOPUS.es
dc.description.abstractThe physical properties of Epoch of Reionization (EoR) galaxies are still poorly constrained by observations. To better understand the ionizing properties of galaxies in the EoR, we investigate deep, rest-frame ultraviolet (UV) spectra of ≃500 star-forming galaxies at 3 ≤ z ≤ 5 selected from the public ESO-VANDELS spectroscopic survey. The absolute ionizing photon escape fraction (fescabs, i.e. the ratio of leaking against produced ionizing photons) is derived by combining absorption line measurements with estimates of the UV attenuation. The ionizing production efficiency (ξion, i.e. the number of ionizing photons produced per non-ionizing UV luminosity) is calculated by fitting the far-UV (FUV) stellar continuum of the VANDELS galaxies. We find that the fescabs and ξion parameters increase towards low-mass, blue UV-continuum slopes and strong Ly α emitting galaxies, and both are slightly higher-than-average for the UV-faintest galaxies in the sample. Potential Lyman Continuum Emitters (LCEs, fescabs ≥ 5 per cent) and selected Lyman Alpha Emitters (LAEs, WLyα ≤ −20 Å) show systematically higher ξion (log ξion(Hz erg−1) ≈ 25.38, 25.41) than non-LCEs and non-LAEs (log ξion(Hz erg−1) ≈ 25.18, 25.14) at similar UV magnitudes. This indicates very young underlying stellar populations (≈10 Myr) at relatively low metallicities (≈0.2 Z⊙). The FUV non-ionizing spectra of potential LCEs is characterized by blue UV slopes (≤−2), enhanced Ly α emission (≤−25 Å), strong UV nebular lines (e.g. high C IV1550/C III1908 ≥0.75 ratios), and weak absorption lines (≤1 Å). The latter suggests the existence of low gas-column-density channels in the interstellar medium, which enables the escape of ionizing photons. By comparing our VANDELS results against other surveys in the literature, our findings imply that the ionizing budget in the EoR was likely dominated by UV-faint, low-mass, and dustless galaxies. © The Author(s) 2023. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.es
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, Volume 522, Issue 4, Pages 6295 - 6325, 1 July 2023es
dc.identifier.doi10.1093/mnras/stad1283
dc.identifier.issn00358711
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/54034
dc.language.isoenes
dc.publisherOxford University Presses
dc.rights.licenseCC BY 4.0 DEED Attribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectdark ageses
dc.subjectdustes
dc.subjectextinctiones
dc.subjectfirst starses
dc.subjectgalaxies: high-redshiftes
dc.subjectgalaxies: ISMes
dc.subjectgalaxies: stellar contentes
dc.subjectreionizationes
dc.subjectultraviolet: galaxieses
dc.titleThe VANDELS survey: the ionizing properties of star-forming galaxies at 3 ≤ z ≤ 5 using deep rest-frame ultraviolet spectroscopyes
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