A Distant Chandra Galaxy Cluster CL J1415.1+3612: Constraint on Evidence of the Cool-Core Phenomenon

Abstract

Deep Chandra observations of the distant cluster of galaxies, CLJ1415.1+3612, are analyzed in order to determine the main physical characteristics of the intracluster medium. We also investigate some properties of a cool-core phenomenon at ~ 10 kpc. Combining all Chandra observations, we derive the average temperature (kT = 6.77±0.54 keV) and the metal abundance (Z = 0.84±0.16 Z⊙) of the cluster. Assuming hydrostatic equilibrium and spherical symmetry, and using deprojected temperature and surface profiles, we estimate the value of total mass of the cluster within R2500, R500 and R200 and find the fraction of gas for these radii. The gas mass fraction of CL J1415.1+3612 at R500 is typical for X-ray clusters, (2.2±0.5)·1014M⊙. The total mass is equal to 3.8±0.4·1014M⊙ at R200 and the corresponding gas fraction is f = 0.21±0.06. In addition, we measured the cooling time of the central region (~10 kpc) as tcool = 0.163±0.021 Gyr. The value of entropy in the same region is Kc = 12.1±2.6 keV cm2. We also checked the redshift value of the cluster using the iron line Kα in the X-ray spectra of CLJ1415.1+3612. Our analysis makes this galaxy cluster to be one of the best investigated distant massive clusters in the X-ray range.

Keywords

• galaxies: clusters: intergalactic medium
• individual: clj1415.1+ 3612
• x-ray: galaxies: clusters