The Massive and Distant Clusters of WISE Survey. XI. Stellar Mass Fractions and Luminosity Functions of MaDCoWS Clusters at z 1
Abstract
We present stellar mass fractions and composite luminosity functions (LFs) for a sample of 12 clusters from the Massive and Distant Clusters of WISE Survey (MaDCoWS) in the redshift range 0.951 ≤ z ≤ 1.43. Using spectral energy distribution fitting of optical and deep midinfrared photometry, we establish the membership of objects along the lines of sight to these clusters and calculate the stellar masses of member galaxies. This allows us to calculate the stellar mass of the clusters much more precisely than in previous works. We find stellar mass fractions for these clusters largely consistent with previous works, and an apparent negative correlation with total cluster mass. We measure a composite 3.6 μm LF down to m* + 2.5 for all 12 clusters. Fitting a Schechter function to the LF, we find a characteristic 3.6 μm magnitude of m* = 19.83 ± 0.12 and faintend slope of α = 0.81 ± 0.10 for the full sample at a mean redshift of $\bar{z}=1.18$ . We also divide the clusters into high and lowredshift bins at $\bar{z}=1.29$ and $\bar{z}=1.06$ , respectively, and measure a composite LF for each bin. We see a small, but statistically significant, evolution in m* and αconsistent with passive evolutionwhen we study the joint fit to the two parameters, which is probing the evolution of faint cluster galaxies at z ~ 1. This highlights the importance of deep IR data in studying the evolution of cluster galaxy populations at high redshift.
 Publication:

The Astrophysical Journal
 Pub Date:
 September 2022
 DOI:
 10.3847/15384357/ac85e5
 arXiv:
 arXiv:2112.12239
 Bibcode:
 2022ApJ...936...71D
 Keywords:

 Galaxy clusters;
 Highredshift galaxy clusters;
 Galactic and extragalactic astronomy;
 584;
 2007;
 563;
 Astrophysics  Astrophysics of Galaxies;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 13 pages, 11 figures, Submitted to ApJ