科研之友
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摘要
Deep Chandra observations of the distant cluster of galaxies, CL J1415.1+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 similar to 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(circle dot)) 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 R-2500; R-500 and R-200 and find the fraction of gas for these radii. The gas mass fraction of CL J1415.1+3612 at R-500 is typical for X-ray clusters, (2.2 +/- 0.5).10(14) M-circle dot. The total mass is equal to 3.8 +/- 0.4.10(14) M-circle dot at R-200 and the corresponding gas fraction is f = 0.21 +/- 0.06. In addition, we measured the cooling time of the central region (similar to 10 kpc) as t(cool) = 0.163 +/- 0.021 Gyr. The value of entropy in the same region is K-c = 12.1 +/- 2.6 keV cm(2). We also checked the redshift value of the cluster using the iron line K alpha in the X-ray spectra of CL J1415.1+3612. Our analysis makes this galaxy cluster to be one of the best investigated distant massive clusters in the X-ray range.
- 出版日期2014
