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[91.05] Chandra Observations of z ~ 1 Clusters from the Red Sequence Cluster Survey

A. K. Hicks, E. Ellingson (University of Colorado at Boulder), M. W. Bautz (Massachusetts Institute of Technology), M. D. Gladders (Carnegie Observatories), H. K. C. Yee (University of Toronto), G. P. Garmire (Penn State University)

Observational studies of cluster evolution over moderate redshift ranges are a powerful tool for constraining cosmological parameters, yet full knowledge of the properties of these clusters remains elusive. By virtue of a highly efficient optical selection technique, the Red Sequence Cluster Survey (RCS) has detected a large sample of high redshift cluster candidates. All six of the clusters from this sample which have recently been observed with the Chandra X-Ray Observatory were detected in the X-ray. These follow-up observations (0.64 < z < 1.0) indicate that these clusters are systematically less luminous than their similarly rich, X-ray selected counterparts. Comparisons with X-ray selected samples suggest that this discrepancy may be due in part to differences in the spatial structure of the clusters. Our initial results from Chandra follow-up observations of six RCS clusters will be presented, including some preliminary spectral information.

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Bulletin of the American Astronomical Society, 36 #2
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