Cross-correlation of the X-ray background with nearby galaxies

Details Cross-correlation of the X-ray background with nearby galaxies Cross-correlation of the X-ray background with nearby galaxies

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...378l..37j&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 378, Sept. 10, 1991, p. L37-L40.

Astronomy and Astrophysics

Astrophysics

28

Galactic Clusters, Relic Radiation, X Ray Sources, Cross Correlation, Statistical Analysis

Scientific paper

The detection of a signal in the cross-correlation of the diffuse 2-10 keV HEAO 1 A-2 X-ray surface brightness with the galaxy surface density derived from diameter-limited samples from the Uppsala General Catalogue is reported. An ad hoc relationship between the X-ray flux and the galaxy counts is used to estimate the local X-ray volume emissivity at 2.8 + or - 1.0 x 10 to the 38th ergs/s/cu Mpc. This result implies that unevolved populations of X-ray sources correlated with present-epoch galaxies can contribute only 13 + or - 5 percent of the cosmic X-ray background.

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