X-ray luminosity functions of clusters of galaxies

Details X-ray luminosity functions of clusters of galaxies X-ray luminosity functions of clusters of galaxies

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366l..61c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 366, Jan. 10, 1991, p. L61-L64. Research supported by ASI and Min

Astronomy and Astrophysics

Astronomy

6

Galactic Clusters, Gravitational Fields, Luminous Intensity, X Ray Irradiation, Cosmology, Galactic Evolution, X Ray Astronomy

Scientific paper

Clusters of galaxies must have a considerable intrinsic spread in their X-ray luminosities at given mass if they are formed bottom-up by direct gravitational instability. The distributions of luminosities at given mass take on the general form of a flat power law with a sharp upper cutoff, consistent with the recently obtained luminosity functions for Abell clusters of given richness classes. The quantitative features depend on the specific hierarchical cosmogony, with models including mass accretion after first collapse providing the best agreement. The same clustering mechanism, after integrating over mass, yields a steep overall luminosity function consistent with existing measurements.

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