X-ray evolution in the ROSAT Brightest Cluster Sample
H. Ebeling, S. W. Allen, C. S. Crawford, A. C. Edge, A. C. Fabian, H. Böhringer, W. Voges, J. P. Huchra
Abstract
We present the X-ray luminosity function (XLF) of the ROSAT Brightest Cluster Sample (BCS), an X-ray selected, flux limited sample of 172 clusters of galaxies at z≤ 0.3 compiled from ROSAT All-Sky Survey data. While the bulk of the BCS consists of Abell clusters, the sample also contains Zwicky clusters and purely X-ray selected systems. The BCS-XLF represents the best determination of the local X-ray luminosity function for galaxy clusters and thus provides an important reference for evolutionary studies. For the BCS itself, we find no convincing evidence for cluster evolution within a redshift of z=0.3. This result is not in conflict with the findings of the EMSS study on cluster evolution.
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