Detailed Analysis of the Cross-Correlation Function between the X-Ray Background and Foreground Galaxies

Details Detailed Analysis of the Cross-Correlation Function between the X-Ray Background and Foreground Galaxies Detailed Analysis of the Cross-Correlation Function between the X-Ray Background and Foreground Galaxies

1996-10-02

arxiv.org/abs/astro-ph/9610018v1

Astronomy and Astrophysics

Astrophysics

52 LaTeX pages, 13 postscript figures, 3 tables, in AASTeX v4.0 format. To appear in ApJ, March 1, 1997, Vol. 477

Scientific paper

10.1086/303687

Recent ROSAT surveys suggest that galaxies constitute the new class of X-ray sources required to explain the full phenomenology of the cosmic X-Ray Background (XRB). To test this hypothesis, we compute the two-point cross-correlation function Wxg(theta) between 62 Einstein-IPC fields (.81-3.5 keV) and the APM Northern galaxy catalog (13.50), the angular dependence of Wxg has two main features: the main signal for theta<4', and an almost flat plateau with an amplitude of Wxg(theta>4')=.015, likely to result from the diffuse X-ray emission by clusters of galaxies. Taking the point-spread function of the X-ray instrument into account, we find that the mean X-ray flux of galaxies with =17.5+/-.3 is (8.1+/-4.7) 10^(-16) ergs/cm^2/s. This agrees with the X-ray flux expected from earlier direct studies of brighter galaxies, which were shown to result in a total galaxy contribution to the XRB of about 13%. We discuss how this powerful cross-correlation method can be used to measure the flux of X-ray sources well below the detection limit of X-ray instruments, and, perhaps, to probe otherwise undetectable faint diffuse X-ray emission.

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