1999/11/29 by I. M. Gioia, Isabella Gioia, Gioia, Isabella
Engineering · Physics and Astronomy · #Astrophysics (astro-ph) #Calibration and Measurement Techniques #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9911496
4 pages, PostScipt file. To appear in ``Large Scale Structure in the X-ray Universe'', Santorini, Greece, 20-22 September 1999
arxiv created 1999/11/29 · openalex publication_date 1999/11/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 deg2 survey by Vikhlini et al. 1998.