A Cluster Deficit in the ROSAT NEP Survey

Details A Cluster Deficit in the ROSAT NEP Survey A Cluster Deficit in the ROSAT NEP Survey

1999-11-29

arxiv.org/abs/astro-ph/9911496v1

Astronomy and Astrophysics

Astrophysics

4 pages, PostScipt file. To appear in ``Large Scale Structure in the X-ray Universe'', Santorini, Greece, 20-22 September 1999

Scientific paper

We have used data from the deepest region of the ROSAT All-Sky Survey, the North Ecliptic Pole (NEP) region, to produce a complete and unbiased X-ray selected sample of distant clusters to understand the nature of cluster evolution and determine implications for large scale structure models. In this contribution results are presented from a comparison between the number of the observed clusters in the NEP survey and the number of expected clusters assuming no-evolution models. There is a deficit by a factor of 2.5-4 of high luminosity, high redshift clusters with respect to the present. The evolution goes in the same direction as the original EMSS result, and the results from the CfA-IfA 160 deg^{2} survey by Vikhlini et al. 1998.

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