Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252...13n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 1, Dec. 1991, p. 13-18.
Astronomy and Astrophysics
Astrophysics
1
Galactic Clusters, X Ray Sources, Heao 1, Statistical Distributions
Scientific paper
Published HEAO1-A1 X-ray data are used to derive a flux-limited statistical sample of 141 galaxy cluster belonging either to the Abell (1958) or the ACO catalogs and brighter than 3 mA1 flux units. Taking contamination from misidentified sources into account, the differential log (N)-log(S) relation for the sample has a slope of -1.9 against the Euclidean value of -2.5, suggesting the existence of an appreciable X-ray luminosity evolution within the lookback time of the sample. Among the X-ray/optically selected clusters, BM I objects are definitely more common than in the general Abell/ACO sample and are the brightest in X-rays. Clusters classified as cD in the Rood-Sastry scheme are the most frequency and the brightest in X-rays, and the frequency of cooling flows is about 35 percent. These findings lead to the expectation that a nonnegligible bias exists in an X-ray selected cluster sample toward rather evolved objects.
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