Other
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9073b&link_type=abstract
HST Proposal ID #9073
Other
Hst Proposal Id #9073 Galaxies
Scientific paper
Ultraluminous X-ray sources {ULX} are second only to AGNs in point-source luminosity yet they have no known optical counterparts. These extraordinary X-ray objects, which radiate at the Eddington luminosity of a 30-100 solar mass object, are non-nuclear sources in normal disk galaxies. One explanation is that they are binary systems where the accreting black hole has a mass of 30-100 solar masses, although this challenges stellar evolutionary models, which do not predict remnants larger than about 10 solar masses. Another possibility is that ULXs are intermediate mass black holes {10^3-10^4 solar masses}, acting as micro-quasars in galaxy disks and representing the link between stellar black holes {4-10 solar masses} and supermassive black holes {10^6-10^10 solar masses}. We can distinguish between the models by identifying the optical counterparts of ULXs and measuring their colors. This would be a fundamental step in gaining an understanding of these enigmatic and possibly new astronomical objects.
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