Abstract
view Abstract Citations (33) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The X-ray luminosity function of Abell clusters. Schwartz, D. A. Abstract X-ray sources identified with Abell clusters of galaxies in distance classes less than or equal to 3 give a quantitative estimate of the volume luminosity function for those clusters emitting between 10 to the 44th and 10 to the 45th power ergs/s in X-rays. At higher luminosities, tentative identifications with more distant clusters can be interpreted at least as an upper limit. This limit allows a smooth extension of the luminosity function, but with a fairly steep decrease in the range from 10 to the 45th to 10 to the 46th power ergs/s. No direct information is available for luminosities less than 10 to the 44th power ergs/s because current X-ray surveys are limited to nearby distances with very few Abell clusters; however, constraints at the low-luminosity end can be set by considering the total volume density of Abell clusters and the upper limit to the numbers of unidentified X-ray sources. The luminosity function must flatten or turn over below 10 to the 44th power ergs/s; therefore, counts of distant X-ray clusters to such a faint intrinsic luminosity can yield cosmological information. Publication: The Astrophysical Journal Pub Date: February 1978 DOI: 10.1086/155876 Bibcode: 1978ApJ...220....8S Keywords: Galactic Clusters; Stellar Luminosity; X Ray Sources; Cosmology; Globular Clusters; Spatial Distribution; Tables (Data); Uhuru Satellite; X Ray Astronomy; Astrophysics; Clusters of Galaxies:Luminosity Function; Clusters of Galaxies:X-Ray Sources full text sources ADS | data products SIMBAD (34) NED (20)
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