AAS 204th Meeting, June 2004
Session 49 X-ray Binary and ULX Populations in Nearby Galaxies
Topical Session, Wednesday, June 2, 2004, 8:30-10:00am, 10:45am-12:30pm, 2:30-4:00pm, 4:15-6:00pm, 601

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[49.05] Theoretical Models for Ultra-Luminous X-ray Sources

M. C. Begelman (JILA, University of Colorado)

I will review theoretical models for the high X-ray fluxes from ULXs. Do these fluxes really imply intermediate black-hole masses, or could they result from geometrical effects such as mild beaming by an accretion funnel or relativistic jet? Is it possible that ULXs are truly radiating at a super-Eddington rate? I will discuss geometric and physical constraints imposed by observations, and observational signatures of the various models. My work on ULXs is supported by grants from NASA (NAG5-12035, Astrophysical Theory Program) and NSF (AST-0307502).

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