Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apjs...56..403k&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 56, Dec. 1984, p. 403-506.
Astronomy and Astrophysics
Astronomy
88
Astronomical Catalogs, Galactic Clusters, Southern Sky, Spaceborne Astronomy, X Ray Sources, Astronomical Models, Correlation, Functions (Mathematics), Heao 1, Luminosity, Tables (Data)
Scientific paper
The results of the HEAO 1 A-1 X-ray survey of galaxy clusters are reported. X-ray error boxes and intensities are presented for all clusters in the Abell catalog and for the catalog of southern clusters and groups compiled by Duus and Newell (1977). A correlation is derived on the basis of the X-ray luminosity function for 2-6 keV which may be used to calculate the contribution of clusters to the diffuse X-ray background at different energies. The cluster X-ray is estimated to be 9.3 percent (+ 1.9 or - 1.5 percent). Correlations between X-ray luminosity and other cluster properties are exmained, and it is found that the distribution of upper limits may be applied to obtaining a more precise estimate of the average X-ray luminosity of clusters. The Abell richness class and southern cluster concentrations were strongly correlated with X-ray luminosity. Correlations between optical x-ray luminosity and optical radius velocity dispersion, spiral fraction, and radio power are analyzed. The evidence for all these correlations was considered to be weak because of poor scatter in the data.
Cruddace Ray G.
Kowalski Piotr M.
Ulmer Melville P.
Wood Kent S.
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