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2004MNRAS.347L..18K - Mon. Not. R. Astron. Soc., 347, L18-L20 (2004/January-2)
Ultraluminous X-ray sources and star formation.
KING A.R.
Abstract (from CDS):
For alternative explanations of the Cartwheel ULX population in terms of intermediate-mass black holes (IMBHs) accreting from massive stars, the inferred production rate ≳10–6 yr–1 implies at least 300 IMBHs, and more probably 3x104, within the star-forming ring. These estimates are increased by factors of η–1 if the efficiency η with which IMBHs find companions of ≳15 M☉within 107 yr is <1. Current models of IMBH production would require a very large mass (≳1010 M☉) of stars to have formed new clusters. Further, the accretion efficiency must be low (≲ 6x10–3) for IMBH binaries, suggesting super-Eddington accretion, even though intermediate black hole masses are invoked with the purpose of avoiding it.
These arguments suggest either that, to make a ULX, an IMBH must accrete from some as yet unknown non-stellar mass reservoir with very specific properties, or that most if not all ULXs in star-forming galaxies are high-mass X-ray binaries.
Abstract Copyright: 2004 RAS
Journal keyword(s): accretion, accretion discs - black hole physics - stars: formation - galaxies: individual: Cartwheel galaxy - galaxies: starburst - X-rays: binaries
Simbad objects: 4
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