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 10^{14} h_{65}^{-1} M_{\sun} within r = 1 h_{65}^{-1} Mpc. The T_x for RX J0849+4452 approximately agrees with the expectation based on its L_{bol} = 3.3^{+0.9}_{-0.5} X 10^{44}^{-1} according to the low redshift L_x - T_x 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.
Cite
@article{arxiv.astro-ph/0012250,
title = {The Intracluster Medium in z > 1 Galaxy Clusters},
author = {S. A. Stanford and B. Holden and P. Rosati and P. Tozzi and S. Borgani and P. R. Eisenhardt and H. Spinrad},
journal= {arXiv preprint arXiv:astro-ph/0012250},
year = {2016}
}
Comments
4 pages in emulateapj style plus 2 color jpegs for Figure 3. Accepted by The Astrophysical Journal