Physics
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.274...39p&link_type=abstract
Nature, vol. 274, July 6, 1978, p. 39, 40.
Physics
2
Galactic Clusters, X Ray Sources, Abundance, Binary Stars, Gravitation, Luminous Intensity, Uhuru Satellite
Scientific paper
A richness analysis of a supercluster sample shows that clusters of galaxies which are located in superclusters (second-order clusters of approximately 30 Mpc radius) are systematically richer than those in the 'field'. The analysis also demonstrates that the expected higher X-ray luminosities of these richer clusters may account for much, if not all, of the possibly large X-ray luminosities from superclusters. The numbers of clusters of each richness class in the Abell statistical sample and in the sample of 14 superclusters (which contain 102 clusters) are reported. The 14 superclusters were obtained from the list of 21 superclusters analyzed by Murray et al. (1978); seven superclusters were eliminated from consideration because they include clusters which are not among the 1682 clusters which form a homogeneous statistical sample.
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