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19 April 2024 |
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Present Evidence for Intermediate Mass Black Holes in ULXs and Future Prospects | | J. M. Miller
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20 Dec 2004 | | Subject: | astro-ph | | Affiliation: | Harvard-Smithsonian CfA | | Abstract: | In a number of the most luminous ULXs (L ~ 1 E+40 erg/s) in nearby galaxies, observations with XMM-Newton and Chandra are revealing evidence which suggests that these ULXs may harbor intermediate-mass black holes (IMBHs). The detection of accretion disk spectral components with temperatures 5-10 times lower than the temperatures observed in stellar-mass black hole binaries near to their Eddington limit may be particularly compelling evidence for IMBH primaries, since T ~ M^(-1/4) for disks around black holes. In some sources, X-ray timing diagnostics also hint at IMBHs. Evidence for IMBHs in a subset of the most luminous ULXs, a discussion of the robustness of this evidence and alternatives to the IMBH interpretation, and prospects for better determining the nature of these sources in the future, are presented in this work. | | Source: | arXiv, astro-ph/0412526 | | Services: | Forum | Review | PDF | Favorites | |
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