S. A. Stanford et al. 2001 ApJ 552 504 doi:10.1086/320583
The Intracluster Medium in z > 1 Galaxy Clusters
FREES. A. Stanford1,6, Bradford Holden1,6, Piero Rosati2, Paolo Tozzi3, Stefano Borgani3, Peter R. Eisenhardt4 and Hyron Spinrad5
Show affiliationsThe 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, which are the most distant known X-ray luminous clusters. 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
keV. Using this temperature and the assumption of an isothermal sphere, the total mass of RX J0849+4452 is found to be 4.0
× 1014 h
M
within r = 1 h Mpc. The TX for RX J0849+4452 approximately agrees with the expectation based on its Lbol = 3.3
× 1044 ergs 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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- Dates
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Issue 2 (2001 May 10)
Received 2000 November 8, accepted for publication 2001 January 2
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The Intracluster Medium in z > 1 Galaxy Clusters
S. A. Stanford et al. 2001 ApJ 552 504
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