Galaxy Clusters as Cosmological Probes AAS 197, January 2001 Session 94.
Galaxy clusters are powerful tools for studying the evolution of our universe.
With Chandra and XMM-Newton observations of high redshift clusters, we can now begin testing models for the evolution of cluster structure. I will review recent progress in studies of galaxy cluster scaling relations. Disagreements between observed and simulated local scaling relations suggest that there must be a heat source for the intracluster medium in addition to the shocks and compressional heating during cluster formation. New studies at higher redshift allow us to test this model and constrain the heating epoch. J.J.M. is a Chandra Fellow supported by grant PF8-1003, awarded through the Chandra Science Center.