Are massive clusters always X-ray luminous?

Details Are massive clusters always X-ray luminous? Are massive clusters always X-ray luminous?

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010xmm..prop..119s&link_type=abstract

XMM-Newton Proposal ID #06729105

Physics

Groups Of Galaxies, Clusters Of Galaxies, Supercluster, A2245, A1336, A1035, A1373, C4-3268

Scientific paper

Studies of galaxy clusters are important for both cosmology and the formation of baryonic structures. An important relation in cluster science is the f_gas - M relation. However, the cluster samples used to constrain this relation are X-ray selected and the current XMM and Chandra archives are also heavily biased to X-ray selected clusters. To address this important bias, we construct a sample of 11 most massive clusters from the SDSS-C4 cluster catalog. Six of them have been observed by XMM or Chandra but they are all X-ray luminous, while the five unobserved clusters are X-ray faint. We propose to observe these five clusters to search for X-ray faint, massive cluster, with potentially important implications on the cluster mass - proxy relations.

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