# The Massive and Distant Clusters of WISE Survey VI: Stellar Mass Fractions of a Sample of High-Redshift Infrared-selected Clusters

## TL;DR

This study measures stellar mass fractions in high-redshift infrared-selected galaxy clusters, compares them with SZ-selected clusters, and reports new SZ detections, masses, and spectroscopic redshifts, including the most distant MaDCoWS cluster.

## Contribution

It provides the first comparison of stellar mass fractions between infrared-selected and SZ-selected high-redshift clusters and reports new SZ detections and redshifts for MaDCoWS clusters.

## Key findings

- No significant difference in mean stellar mass fractions between selection methods.
- Large range in stellar mass fractions observed in SZ-selected clusters.
- Identification of the most distant MaDCoWS cluster to date.

## Abstract

We present measurements of the stellar mass fractions ($f_\star$) for a sample of high-redshift ($0.93 \le z \le 1.32$) infrared-selected galaxy clusters from the Massive and Distant Clusters of WISE Survey (MaDCoWS) and compare them to the stellar mass fractions of Sunyaev-Zel'dovich (SZ) effect-selected clusters in a similar mass and redshift range from the South Pole Telescope (SPT)-SZ Survey. We do not find a significant difference in mean $f_\star$ between the two selection methods, though we do find an unexpectedly large range in $f_\star$ for the SZ-selected clusters. In addition, we measure the luminosity function of the MaDCoWS clusters and find $m^*= 19.41\pm0.07$, similar to other studies of clusters at or near our redshift range. Finally, we present SZ detections and masses for seven MaDCoWS clusters and new spectroscopic redshifts for five MaDCoWS clusters. One of these new clusters, MOO J1521+0452 at $z=1.31$, is the most distant MaDCoWS cluster confirmed to date.