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Cross-correlation of the unresolved X-ray background with faint galaxies

Newsam, AM; McHardy, IM; Jones, LR; Mason, KO; (1999) Cross-correlation of the unresolved X-ray background with faint galaxies. Monthly Notices of the Royal Astronomical Society , 310 (1) 255 - 261. 10.1046/j.1365-8711.1999.02939.x. Green open access

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Abstract

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.

Type: Article
Title: Cross-correlation of the unresolved X-ray background with faint galaxies
Open access status: An open access version is available from UCL Discovery
DOI: 10.1046/j.1365-8711.1999.02939.x
Publisher version: http://dx.doi.org/10.1046/j.1365-8711.1999.02939.x
Language: English
Additional information: © 1999 RAS Definitive versions of articles pre-2013 are available at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966, now published by http://mnras.oxfordjournals.org
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/188638
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