# The 3XMM/SDSS Stripe 82 Galaxy Cluster Survey II. X-ray and optical properties of the cluster sample

## TL;DR

This study characterizes the X-ray and optical properties of 54 galaxy clusters from the 3XMM/SDSS Stripe 82 survey, analyzing their temperature, luminosity, galaxy morphology, and luminosity functions across redshifts.

## Contribution

It provides the first optical and X-ray analysis of 54 galaxy clusters, including 20 studied in X-rays and all in optical, with insights into their properties and galaxy populations.

## Key findings

- X-ray luminosity-temperature relation consistent with literature
- No strong variation in early/late galaxy fractions with cluster mass
- Galaxy luminosity functions studied across multiple bands and redshifts

## Abstract

We present X-ray and optical properties of the optically confirmed galaxy cluster sample from the 3XMM/SDSS Stripe 82 cluster survey. The sample includes 54 galaxy clusters in the redshift range of 0.05-1.2, with a median redshift of 0.36. We first present the X-ray temperature and luminosity measurements that are used to investigate the X-ray luminosity-temperature relation. The slope and intercept of the relation are consistent with those published in the literature. Then, we investigate the optical properties of the cluster galaxies including their morphological analysis and the galaxy luminosity functions. The morphological content of cluster galaxies is investigated as a function of cluster mass and distance from the cluster center. No strong variation of the fraction of early and late type galaxies with cluster mass is observed. The fraction of early type galaxies as a function of cluster radius varies as expected. The individual galaxy luminosity functions (GLFs) of red sequence galaxies were studied in the five ugriz bands for 48 clusters. The GLFs were then stacked in three mass bins and two redshift bins. Twenty clusters of the present sample are studied for the first time in X-rays, and all are studied for the first time in the optical range. Altogether, our sample appears to have X-ray and optical properties typical of average cluster properties.