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Ultraluminous X-ray Sources, High Redshift QSOs and Active Galaxies

G. Burbidge·E. M. Burbidge·H. C. Arp·W. M. Napier
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Abstract

It is shown that all of the 32 point X-ray sources which lie within about 10' of the centre of nearby galaxies, and which have so far been optically identified are high redshift objects - AGN or QSOs. Thus the surface density of these QSOs p similar or equal to 0.1 per square arc minute. Some of them were originally discovered as X-ray sources and classified as ultraluminous X-ray sources (ULXs), nearly all of which lie near the centers of active galaxies. We demonstrate that this concentration around galactic nuclei is of high statistical significance: the probabiliy that p that they are accidental lies in the range one in a thousand to one in ten thousand, and apparently this excess cannot be accounted for by microlensing.

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G. Burbidge, E. M. Burbidge, H. C. Arp, W. M. Napier. 2006-05-04. Ultraluminous X-ray Sources, High Redshift QSOs and Active Galaxies. https://arxiv.org/abs/astro-ph/0605140

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