HSC-XXL : Baryon budget of the 136 XXL Groups and Clusters
Daichi Akino, Dominique Eckert, Nobuhiro Okabe, Mauro Sereno, Keiichi, Umetsu, Masamune Oguri, Fabio Gastaldello, I-Non Chiu, Stefano Ettori, August, E. Evrard, Arya Farahi, Ben Maughan, Marguerite Pierre, Marina Ricci, Ivan, Valtchanov, Ian Mccarthy, Sean Mcgee

TL;DR
This study analyzes the baryon content of 136 galaxy groups and clusters using multi-wavelength data, revealing how gas and stellar mass fractions vary with cluster mass and confirming consistency with simulations.
Contribution
It provides the first comprehensive Bayesian analysis of baryonic component covariances in a large, diverse sample of galaxy clusters, incorporating weak lensing and X-ray data.
Findings
Gas mass fraction increases with cluster mass, steeper than self-similar models.
Stellar mass fraction decreases with cluster mass, shallower than unity.
No significant redshift evolution of baryonic components.
Abstract
We present our determination of the baryon budget for an X-ray-selected XXL sample of 136 galaxy groups and clusters spanning nearly two orders of magnitude in mass () and the redshift range . Our joint analysis is based on the combination of HSC-SSP weak-lensing mass measurements, XXL X-ray gas mass measurements, and HSC and SDSS multiband photometry. We carry out a Bayesian analysis of multivariate mass-scaling relations of gas mass, galaxy stellar mass, stellar mass of brightest cluster galaxies (BCGs), and soft-band X-ray luminosity, by taking into account the intrinsic covariance between cluster properties, selection effect, weak-lensing mass calibration, and observational error covariance matrix. The mass-dependent slope of the gas mass--total mass () relation is found to be , which is steeper than the…
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