Chan, Jeffrey C. C.Jeffrey C. C.ChanWilson, GillianGillianWilsonRudnick, GregoryGregoryRudnickMuzzin, AdamAdamMuzzinBalogh, MichaelMichaelBaloghNantais, JulieJulieNantaisvan der Burg, Remco F. J.Remco F. J.van der BurgCerulo, PierluigiPierluigiCeruloBIVIANO, ANDREAANDREABIVIANOCooper, Michael C.Michael C.CooperDemarco, RicardoRicardoDemarcoForrest, BenBenForrestLidman, ChrisChrisLidmanNoble, AllisonAllisonNobleOld, LyndsayLyndsayOldPintos-Castro, IreneIrenePintos-CastroReeves, Andrew M. M.Andrew M. M.ReevesWebb, Kristi A.Kristi A.WebbYee, Howard K. C.Howard K. C.YeeAbdullah, Mohamed H.Mohamed H.AbdullahDE LUCIA, GABRIELLAGABRIELLADE LUCIAMarchesini, DaniloDaniloMarchesiniMcGee, Sean L.Sean L.McGeeStefanon, MauroMauroStefanonZaritsky, DennisDennisZaritsky2021-01-072021-01-0720190004-637Xhttp://hdl.handle.net/20.500.12386/29542We present results on the rest-frame H-band luminosity functions (LFs) of red-sequence galaxies in seven clusters at 1.0 < z < 1.3 from the Gemini Observations of Galaxies in Rich Early Environments Survey. Using deep GMOS z<SUP>\prime</SUP> and IRAC 3.6 μm imaging, we identify red-sequence galaxies and measure their LFs down to {M}<SUB>H</SUB>∼ {M}<SUB>H</SUB><SUP>* </SUP>+(2.0-3.0). By stacking the entire sample, we derive a shallow faint-end slope of α ∼ -{0.35}<SUB>-0.15</SUB><SUP>+0.15</SUP> and {M}<SUB>H</SUB><SUP>* </SUP>∼ -{23.52}<SUB>-0.17</SUB><SUP>+0.15</SUP>, suggesting that there is a deficit of faint red-sequence galaxies in clusters at high redshift. By comparing the stacked red-sequence LF of our sample with a sample of clusters at z ∼ 0.6, we find an evolution of the faint end of the red sequence over the ∼2.6 Gyr between the two samples, with the mean faint-end red-sequence luminosity growing by more than a factor of 2. The faint-to-luminous ratio of our sample ({0.78}<SUB>-0.15</SUB><SUP>+0.19</SUP>) is consistent with the trend of decreasing ratio with increasing redshift proposed in previous studies. A comparison with the field shows that the faint-to-luminous ratios in clusters are consistent with those in the field at z ∼ 1.15 and exhibit a stronger redshift dependence. Our results support the picture that the buildup of faint red-sequence galaxies occurs gradually over time and suggest that faint cluster galaxies, similar to bright cluster galaxies, already experience the quenching effect induced by the environment at z ∼ 1.15.STAMPAenArticle10.3847/1538-4357/ab2b3a2-s2.0-85071905882000479029300001https://iopscience.iop.org/article/10.3847/1538-4357/ab2b3a2019ApJ...880..119CFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation