J/A+A/678/A174ivo://CDS.VizieR/J/A+A/678/A174doi:10.26093/cds/vizier.36780174CDSGoovaerts I.Pello R.Thai T.T.Tuan-Anh P.Richard J.Claeyssens A.,Carinos E.de La Vieuville G.Matthee J.2025-05-22T20:01:23Z2023-10-18T07:56:22ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxy-clustersredshiftedFaint galaxies are theorised to have played a major role, perhaps the dominant role, in reionising the Universe. Their properties, as well as the Lyman-{alpha} emitter (LAE) fraction, XLAE, could provide useful insights into this epoch. 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-{alpha} emission. 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-{alpha} luminosities in the range 39.5<~log(LLy{alpha})(erg/s)<~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. 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 EWLy{alpha} 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-{alpha} equivalent width (EWLy{alpha}), UV-bright galaxies situated in reionised bubbles and overdensities. This result is especially interesting in the context of similar, UV-bright, low EWLy{alpha} 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.2023A&A...678A.174Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/678/A174CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/678/A174https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/678/A174http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/678/A174https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/678/A174https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/678/A174http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/678/A174GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/678/A174/table1 (Details of each lensing cluster used in this study)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/678/A174/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/678/A174/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/678/A174/table1?GETtext/xml+votable180.050000true3.58625833-30.4001750.0055555555555555566/16486 17761 34793 46974https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/678/A174?format=asciidefaultJ/A+A/678/A174/table1Details of each lensing cluster used in this studyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainzRedshiftsrc.redshiftfloatTexpMUSE Exposure Time (Hrs) (1)htime.duration;obs.exposurecharCo-VCo-volume (Mpc^3)Mpc**3phys.volumeintLAENumber of LAE onlymeta.numberintLBGNumber of LBG onlymeta.numberintLAE+LBGNumber of LAE + LBGmeta.numberintLAE+contNumber of LAE + continuummeta.numberintRedCatName of the fits redshift catalog, in subdirectory redshiftmeta.id;meta.filecharLineCatName of the fits spectral lines catalog, in subdirectory spectral-linesmeta.id;meta.filecharMassModName of the Mass model repertory (2)meta.idcharClusterName of clustermeta.id;meta.maincharJ/A+A/678/A174/table25{sigma} limiting magnitudes of each filter for the four clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFilterFiltermeta.id;instr.filtercharA2744? 5{sigma} limiting magnitude in filter for A2744 (AB)magphot.magfloatnullableA370? 5{sigma} limiting magnitude in filter for A370 (AB)magphot.magfloatnullableAS10635{sigma} limiting magnitude in filter for AS1063 (AB)magphot.magfloatM04165{sigma} limiting magnitude in filter for M0416 (AB)magphot.magfloat