2XMM J100451.6+411627: A cool core cluster at z=0.82

TL;DR

This study identifies and characterizes a distant galaxy cluster at redshift 0.82 with a strong cool core, using X-ray and optical data, revealing insights into high-redshift cluster cooling processes.

Contribution

First detailed analysis of a high-redshift galaxy cluster with a confirmed cool core using multi-wavelength observations.

Findings

Cluster at z=0.82 with temperature 4.2 keV

Evidence of a strong cool core from surface brightness and temperature profile

Relaxed morphology indicating a mature cluster state

Abstract

- Aims: Gas cooling in the centre of massive galaxy clusters is believed to feed the most powerful active galactic nuclei in the Universe. How often clusters at high redshift show such cool cores has still to be explored by current and upcoming X-ray telescopes. - Methods: We correlated extended X-ray emissions from the second XMM-Newton source catalogue with SDSS data to particularly identify distant clusters. 2XMM J100451.6+411627 is a candidate luminous enough to obtain its redshift and temperature from the X-ray spectrum. We also determine the surface luminosity profile and estimate the temperature in a few spherical bins. The analysis is complemented by a Subaru g'r'i'-image. - Results: 2XMM J100451.6+411627 has a redshift a redshift of z=0.82+-0.02 and a temperature of k_BT = 4.2+-0.4 keV. A double-beta profile fit yields a highly concentrated surface brightness, c_SB = 0.32, i.e. the clusters hosts very likely a strong cool core. This is supported by the relaxed morphology of the cluster and an central temperature decrease.