Intermediate Mass Black Holes in NGC 253 and Related Objects

Physics

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Scientific paper

Evidence is mounting for the existence of intermediate mass black holes, which occupy the mass spectrum somewhere between the stellar-mass variety (a few to tens of solar masses) and the supermassive variety (millions to billions of solar masses). Theoretical stellar and black hole evolutionary models predict intermediate mass black holes, but until recently, there have been few observational signs of them. A new class of x-ray sources with apparent luminosities that are tens to thousands of times the Eddington limit for a neutron star is offering hope of finding intermediate mass black holes. However, the nature of these x-ray sources is still controversial. I will review observations of ultraluminous x-ray sources and the arguments for and against intermediate mass black holes. I suggest that, instead of just concentrating on ultraluminous x-ray sources as a class, the chance of finding genuine intermediate mass black holes might improve if we concentrate on places where we most expect to find them from an evolutionary standpoint.

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