Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...199l..89b&link_type=abstract
Astrophysical Journal, vol. 199, July 15, 1975, pt. 2, p. L89-L92.
Astronomy and Astrophysics
Astrophysics
21
Astronomical Catalogs, Galactic Clusters, X Ray Sources, Computer Techniques, Extragalactic Radio Sources, Position (Location), Statistical Analysis
Scientific paper
Positional correlations are analyzed among the 51 unidentified high-galactic-latitude X-ray sources in the third Uhuru catalog, all 2712 rich clusters of galaxies in the Abell catalog, and all bright galaxies in the Zwicky catalog. Computer-simulated Uhuru catalogs are used to evaluate the chance coincidence rate as well as its dispersion, and the validity is confirmed of practically all the previously suggested identifications of 3U sources with nearby rich Abell clusters. It is shown that one or two of the distance-group 4 Abell clusters may be associated with 3U sources and that very few, if any, of the 3U sources are associated with the most distant Abell clusters. On this basis, an upper limit to the X-ray luminosity is established which is in agreement with the highest such value observed for nearby clusters. Although about 50% of the source error boxes contain a bright Zwicky galaxy, very few valid identifications are expected.
Bahcall John N.
Bahcall Neta A.
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