A Cluster Deficit in the ROSAT NEP Survey
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/9911496,
title = {A Cluster Deficit in the ROSAT NEP Survey},
author = {Isabella Gioia},
journal= {arXiv preprint arXiv:astro-ph/9911496},
year = {2007}
}
Comments
4 pages, PostScipt file. To appear in ``Large Scale Structure in the X-ray Universe'', Santorini, Greece, 20-22 September 1999