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Published online by Cambridge University Press: 24 November 2004
I review the evidence in favour of the existence of intermediate mass black holes (IMBH) in a sub-set of the class of ultraluminous X-ray source (ULX). Their X-ray properties and information on their local environments is beginning to point towards the presence of IMBHs in some, and perhaps the most luminous, ULX.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html