Remnants of massive metal-poor stars: viable engines for ultra-luminous X-ray sources
arXiv:1009.5706 · doi:10.1002/asna.201011511
Abstract
Massive metal-poor stars might end their life by directly collapsing into massive (~25-80 Msun) black holes (BHs). We derive the number of massive BHs (N_BH) that are expected to form per galaxy via this mechanism. We select a sample of 66 galaxies with X-ray coverage, measurements of the star formation rate (SFR) and of the metallicity. We find that N_BH correlates with the number of observed ultra-luminous X-ray sources (ULXs) per galaxy (N_ULX) in this sample. We discuss the dependence of N_ULX and of N_BH on the SFR and on the metallicity.
4 pages, 3 figures, accepted for publication in the Astronomische Nachrichten, to appear in the proceedings of the conference "Ultra-luminous X-ray sources and Middle Weight Black Holes" (Madrid, May 24-26, 2010)
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- Connecting the metallicity dependence and redshift evolution of high-mass X-ray binaries
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