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E. Reese (University of California, Berkeley), J. Mohr (University of Illinois, Urbana-Chamapaign)
Clusters of galaxies appear to be regular objects, illustrated by scaling relations of global properties of galaxy clusters. Nearby galaxy clusters and simulations of galaxy clusters show a tight correlation between the X-ray isophotal size of a galaxy cluster and its X-ray temperature. With a simple model for clusters and standard models for the redshift evolution of clusters we expect that the X-ray isophotal size-temperature (ST) relation does not evolve with redshift. Our initial study of archival ROSAT data for a sample of intermediate redshift galaxy clusters supported the lack of evolution. In addition, we used our sample to measure distances to intermediate redshift, enabling weak constraints on the geometry of the universe. Here we extend our sample size and redshift range, further testing the standard evolution model of galaxy clusters. In addition, we extend our analysis method in this study and also explore possible evolution in the intracluster medium mass-temperature (MT) relation as well as the ST relation.
EDR acknowledges support from Chandra Fellowship grant PF1-20020, awarded through the Chandra Science Center, which is operated by the Smithsonian Astrophysical Observatory for NASA under under contract NAS8-39073. JJM acknowledged support from NASA LTSA award NAG5-11415.
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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.