X-ray mass measurement of massive galaxy clusters in the HSC SSP survey region

Keita Miyaoka

We present X-ray measurements and joint X-ray, optical and weak-lensing analysis for massive galaxy clusters in the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP) survey region. The HSC SSP survey is an on-goining, legacy-type program covering 1400 deg^2 and provides us with the exquisite quality of shape and photometry catalogs for an enormous number of galaxy clusters. However, X-ray observations to measure hydrostatic equilibrium mass essentially require deep exposure and thus face a difficulty to carry out follow-up observations for those all clusters. We therefore selected 22 clusters from the Meta-Catalog of X-ray Detected Clusters (MCXC) catalog with the criteria of Lx E(z)^-7/3>10^44 erg s^-1, approximately equivalent to M500>2x10^14 h70^-1 Msun, and z<0.4 to complete the program in the early phase of the SSP survey.
We carry out a systematic X-ray analysis using XMM-Newton data.Gas temperatures are measured by a simultaneous fit of X-ray spectra extracted from concentric annuli to subtract all background components. Gas density profile is derived by fitting X-ray surface brightness with a radial distribution model of X-ray emissivity convolved with the instrumental PSF. We present the hydrostatic equilibrium mass, gas faction and baryon fraction for several clusters from our sample, and compare them with weak-lensing masses. The HSC SSP survey gives a significant impact on other wavelengths and launches us into a new era of multiwavelength studies, which is a significant benefit for the cluster community.