Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-06-14
Astronomy and Astrophysics
Astrophysics
7 pages LaTeX including 9 EPS figures. Uses mn.sty. Accepted for publication by MNRAS
Scientific paper
10.1046/j.1365-8711.1999.02939.x
At the faint end of the deepest X-ray surveys, a population of X-ray luminous galaxies is seen. In this paper, we present the results of a cross-correlation between the residual, unresolved X-ray photons in a very deep X-ray survey and the positions of faint galaxies, in order to examine the importance of these objects at even fainter flux levels. We measure a significant correlation on all angular scales up to ~1 arcmin. This signal could account for a significant fraction of the unresolved X-ray background, approximately 35 per cent if the clustering is similar to optically selected galaxies. However, the angular form of the correlation is seen to be qualitatively similar to that expected for clusters of galaxies and the X-ray emission could be associated with hot gas in clusters or with QSOs within galaxy clusters rather than emission from individual faint galaxies. The relative contribution from each of these possibilities cannot be determined with the current data.
Jones Lynne
Mason Keith
McHardy Ian M.
Newsam Andrew M.
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