The Massive and Distant Clusters of WISE Survey XI: Stellar Mass Fractions and Luminosity Functions of MaDCoWS Clusters at $z\sim 1$

Abstract

We present stellar mass fractions and composite luminosity functions (LFs) for a sample of \Ncl\ clusters from the Massive and Distant Clusters of WISE Survey (MaDCoWS) at a redshift range of $0.951\le z\le 1.43$. Using SED fitting of optical and deep mid-infrared photometry, we establish the membership of objects along the lines-of-sight to these clusters and calculate the stellar masses of member galaxies. We find stellar mass fractions for these clusters largely consistent with previous works, including appearing to display a negative correlation with total cluster mass. We measure a composite $3.6\mu \mathrm{m}$ LF down to $m^{\ast }+2.5$ for all 12 clusters. Fitting a Schechter function to the LF, we find a characteristic $3.6\mu \mathrm{m}$ magnitude of $m^{\ast }=19.83\pm 0.12$ and faint-end slope of $\alpha =-0.81\pm 0.10$ for the full sample at a mean redshift of $\bar{z}=1.18$. We also divide the clusters into high- and low-redshift 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 $m^{\ast }$ and $\alpha$ -- consistent with passive evolution -- when we study the joint fit to the two parameters, which is probing the evolution of faint cluster galaxies at $z\sim 1$. This highlights the importance of deep IR data in studying the evolution of cluster galaxy populations at high-redshift.

arXiv comment13 pages, 11 figures, Submitted to ApJ

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