Cluster Evolution in the Wide Angle ROSAT Pointed Survey (WARPS)

Details Cluster Evolution in the Wide Angle ROSAT Pointed Survey (WARPS) Cluster Evolution in the Wide Angle ROSAT Pointed Survey (WARPS)

1997-01-31

arxiv.org/abs/astro-ph/9702009v1

Astronomy and Astrophysics

Astrophysics

3 pages, Latex file, 1 figure. To appear in Proceedings of the 18th Texas Symposium in Relativistic Astrophysics, Chicago, 15-

Scientific paper

A new flux limited catalogue of low luminosity (Lx <= 10^44 erg/s) X-ray galaxy clusters and groups covering a redshift range of z~0.1 to z~0.7 has been produced from the WARPS project. We present the number counts of this low luminosity population at high redshifts (z>0.3). The results are consistent with an unevolving population which does not exhibit the evolution seen in the higher luminosity cluster population. These observations can be qualitatively described by self-similarly evolving dark matter and preheated IGM models of X-ray cluster gas, with a power law index for the spectrum of matter density fluctuations n >= -1.

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