The influence of cluster cooling flows on imaging X-ray surveys

Details The influence of cluster cooling flows on imaging X-ray surveys The influence of cluster cooling flows on imaging X-ray surveys

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244...58p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, May 1, 1990, p. 58-63. Research supported by the R

Astronomy and Astrophysics

Astrophysics

39

Cooling Flows (Astrophysics), Galactic Clusters, Sky Surveys (Astronomy), X Ray Sources, Brightness Distribution, Dark Matter, Faint Objects, Galactic Evolution, Heao 2, Luminosity

Scientific paper

A study of the effects of cooling flows on the X-ray source counts of clusters of galaxies found in the Einstein Observatory medium sensitivity surveys is reported. The point-source detection algorithm used in the surveys preferentially detects cooling-flow clusters. The number of clusters in the medium sensitivity surveys is consistent with an extrapolation from brighter clusters, provided that most clusters contain cooling flows. The slope of the observed source counts is significantly flatter than the simple Euclidean value of 1.5. The flat slope is attributed to a selection effect rather than to evolution. Strong positive evolution of the X-ray properties of clusters is ruled out. Predictions are presented for the future ROSAT surveys.

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