Evolution of Clusters of Galaxies in the 150 Square Degree ROSAT Survey

Details Evolution of Clusters of Galaxies in the 150 Square Degree ROSAT Survey Evolution of Clusters of Galaxies in the 150 Square Degree ROSAT Survey

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.5310v&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #53.10; Bulletin of the American Astronomical Society, Vol. 29, p.1302

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a sample of 220 clusters detected as extended X-ray sources in a wide area ROSAT PSPC survey covering 150 square degrees on the sky. The log (N)-log (S) relation for clusters is best described by a model in which the comoving number density increases while the typical cluster X-ray luminosity decreases with redshift. Using both spectroscopic and photometric redshifts, we search for evolution of cluster core-radii. We find no evolution of cluster sizes between z=0.5 and z=0. For an assumined q_0=0.5, the ratio of the average core radius at z ~ 0.5 and z=0 is 1.1 +/- 0.3.

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