The Nature of Ultraluminous X-Ray Sources (ULX) Very Near or Inside Galaxies

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X-ray point sources in and around several galaxies, detected by Chandra and XMM Newton, following data from ROSAT, have been named ``intermediate luminosity X-ray objects (IXOs)", or ``ultraluminous X-ray sources (ULXs)." Earlier this year we suggested that many of the ULXs lying close to the nuclei of low-redshift galaxies would turn out to be QSOs with high z (Burbidge, Burbidge and Arp, A&A, 2003, 400, L17). By now, a number of optical objects identified as ULX sources lying very close to the nuclei of galaxies such as NGC 720, 891, 1073, 3628 and others have been found to be high redshift QSOs. The preliminary results of a run on the LRIS instrument on the Keck I telescope on Mauna Kea, Hawaii on a number of ULX candidates will be described.

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