The X-ray Size-Temperature Relation for Intermediate Redshift Galaxy Clusters
Abstract
We present the first measurements of the X-ray size-temperature (ST) relation in intermediate redshift (z~0.30) galaxy clusters. We interpret the local ST relation (z~0.06) in terms of underlying scaling relations in the cluster dark matter properties, and then we use standard models for the redshift evolution of those dark matter properties to show that the ST relation does not evolve with redshift. We then use ROSAT HRI observations of 11 clusters to examine the intermediate redshift ST relation; for currently favored cosmological parameters, the intermediate redshift ST relation is consistent with that of local clusters. Finally, we use the ST relation and our evolution model to measure angular diameter distances; with these 11 distances we evaluate constraints on OmegaM and OmegaL which are consistent with those derived from studies of Type Ia supernovae. The data rule out a model with OmegaM=1 and OmegaL=0 with 2.5 sigma confidence. When limited to models where OmegaM+OmegaL=1, these data are inconsistent with OmegaM=1 with 3 sigma confidence.
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