Statistics – Computation
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351...22d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 351, March 1, 1990, p. 22-30. Research supported by MPI and CNR.
Statistics
Computation
33
Active Galactic Nuclei, Galactic Clusters, Quasars, X Ray Sources, Autocorrelation, Computational Astrophysics, Galactic Evolution, Heao 1, Red Shift, Seyfert Galaxies
Scientific paper
Expectations for the angular correlation function of intensity fluctuations of the extragalacitc 2-10 keV X-ray background are discussed in relation to the two-point spatial correlation functions, xi(r), of X-ray sources. A simple analytic formula for the amplitude of intensity correlations, Gamma(theta), holding in the low-redshift, small-separation approximation, is derived. The HEAO 1 A-2 upper limits on Gamma(theta) have been exploited to derive constraints on the local xi(r) functions of rich clusters of galaxies, of AGNs, and on the AGN-cluster cross-correlation, as well as on evolution of the correlation functions with cosmic time. X-ray data are found to be compatible with the Bahcall and Soneira estimates of xi(cluster-cluster) as well as with the results of recent studies of quasar clustering.
Boldt Elihu A.
Danese Lugi
de Zotti Gainfranco
Franceschini Alberto
Marshall Francis E.
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