Mathematics – Logic
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005idm..conf...25b&link_type=abstract
THE IDENTIFICATION OF DARK MATTER. Proceedings of the Fifth International Workshop. Held 6-10 September 2004 in Edinburgh, UK. E
Mathematics
Logic
Scientific paper
We present the first results of the Ω project, a large XMM program devoted to observe distant SHARC clusters. For the first time a measurement of the L - T evolution with XMM has been obtained. We found clear evidence for a positive evolution of the L - T relation, in agreement with previous analysis based on ASCA and Chandra observations. Its cosmological implication is also discussed based on a new analysis of the modeling of different X-ray surveys : EMSS, RDCS, MACS, SHARC, 160 deg2. It is found that a high matter density model fits remarkably well all these surveys while concordance models produce far more faint clusters than observed counts, independently of the local amplitude σ8, provide that the local abundance of clusters is actually matched, in agreement with independent previous analyzes following the same strategy. This apparent severe failure of the concordance model could be the indication of a deviation from the expected scaling of the M - T relation with redshift. However, no signature of such possibility is found in existing data. We conclude that a self consistent represen- tation of clusters abundance evolution can be obtained only in an Einstein-de Sitter universe.
Blanchard Alain
Sadat Rachida
Vauclair Sylvie
XMM-Newton Ω-Project Collaboration
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