Evolution of the cluster X-ray scaling relations since z>0.4
Astrophysics
2009-11-07 v1
Abstract
We derive correlations between X-ray temperature, luminosity, and gas mass for a sample of 22 distant, z>0.4, galaxy clusters observed with Chandra. We detect evolution in all three correlations between z>0.4 and the present epoch. In particular, in the Omega=0.3, Lambda=0.7 cosmology, the luminosity corresponding to a fixed temperature scales approximately as (1+z)**(1.5+-0.3); the gas mass for a fixed luminosity scales as (1+z)**(-1.8+-0.4); and the gas mass for a fixed temperature scales as (1+z)**(-0.5+-0.4) (all uncertainties are 90% confidence). We briefly discuss the implication of these results for cluster evolution models.
Cite
@article{arxiv.astro-ph/0207445,
title = {Evolution of the cluster X-ray scaling relations since z>0.4},
author = {A. Vikhlinin and L. VanSpeybroeck and M. Markevitch and W. R. Forman and L. Grego},
journal= {arXiv preprint arXiv:astro-ph/0207445},
year = {2009}
}
Comments
submitted to ApJ Letters