Publication Date:
2013-04-26
Description:
We present the results of Chandra and Suzaku X-ray observations of nine moderate-redshift (0.16 〈 z 〈 0.42) clusters discovered via the Red-sequence Cluster Survey (RCS). Surface brightness profiles are fitted to β-models, gas masses are determined, integrated spectra are extracted within R 2500 , and X-ray temperatures and luminosities are inferred. The L X – T X relationship expected from self-similar evolution is tested by comparing this sample to our previous X-ray investigation of nine high-redshift (0.6 〈 z 〈 1.0) optically selected clusters. We find that optically selected clusters are systematically less luminous than X-ray selected clusters of similar X-ray temperature at both moderate and high z . We are unable to constrain evolution in the L X – T X relation with these data, but find it consistent with no evolution, within relatively large uncertainties. To investigate selection effects, we compare the X-ray properties of our sample to those of clusters in the representative X-ray selected sample, also determined within R 2500 . We find that while RCS cluster X-ray properties span the entire range of those of massive clusters selected by other methods, their average X-ray properties are most similar to those of dynamically disturbed X-ray selected clusters. This similarity suggests that the true cluster distribution might contain a higher fraction of disturbed objects than are typically detected in X-ray selected surveys.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
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