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The Rest-frame H-band Luminosity Function of Red-sequence Galaxies in Clusters at 1.0 < z < 1.3

We 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\prime and IRAC 3.6 μm imaging, we identify red-sequence galaxies and measure their LFs down to {M}H∼ {M}H* +(2.0-3.0). By stacking the entire sample, we derive a shallow faint-end slope of α ∼ -{0.35}-0.15+0.15 and {M}H* ∼ -{23.52}-0.17+0.15, 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}-0.15+0.19) 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.

The Astrophysical Journal, Volume 880, Issue 2, article id. 119, 2019

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Authors: 
Chan, Jeffrey C. C.; Wilson, Gillian; Rudnick*, Gregory; Muzzin, Adam; Balogh, Michael; Nantais, Julie; et al. *KU Author