Other
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.2001i&link_type=abstract
American Astronomical Society, HEAD meeting #8, #20.01; Bulletin of the American Astronomical Society, Vol. 36, p.945
Other
Scientific paper
The presence of non-nuclear variable ultraluminous (>1039 ergs s-1) X-ray sources (ULXs) within nearby galaxies has spawned a flurry of debate regarding the nature of these objects. The X-ray luminosities of the brightest ULXs exceed the Eddington luminosity onto a neutron star by over two orders of magnitude. Taken at face value and assuming the X-ray emission is isotropic, this implies a mass of at least several hundred solar masses for the accreting object -- the much-sought-after intermediate mass black hole (IMBH). However, difficulty in creating a black hole in this mass range has led others to develop alternative descriptions of ULXs involving a black hole of mass 10 solar masses, in which the high X-ray luminosities are accounted for by anisotropic beaming or super-Eddington accretion. In this talk I will review the properties of ULXs, as well as discuss the pros and cons of the major ULX models.
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