The Intracluster Medium in z > 1 Galaxy Clusters
Abstract
The Chandra X-ray Observatory was used to obtain a 190 ks image of three high redshift galaxy clusters in one observation. The results of our analysis of these data are reported for the two z > 1 clusters in this Lynx field, including the most distant known X-ray selected cluster. Spatially-extended X-ray emission was detected from both these clusters, indicating the presence of hot gas in their intracluster media. A fit to the X-ray spectrum of RX J0849+4452, at z=1.26, yields a temperature of kT = 5.8+2.8-1.7 keV. Using this temperature and the assumption of an isothermal sphere, the total mass of RX J0849+4452 is found to be 4.0+2.4-1.9 X 1014 h65-1 M within r = 1 h65-1 Mpc. The Tx for RX J0849+4452 approximately agrees with the expectation based on its Lbol = 3.3+0.9-0.5 X 1044 erg s-1 according to the low redshift Lx - Tx relation. The very different distributions of X-ray emitting gas and of the red member galaxies in the two z > 1 clusters, in contrast to the similarity of the optical/IR colors of those galaxies, suggests that the early-type galaxies mostly formed before their host clusters.
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