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Date and Time of the Query: 2019-08-24 T01:15:00 PDT
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For refcode 2010MNRAS.408..234M:
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Copyright by Royal Astronomical Society. 2010MNRAS.408..234M Ultra-luminous X-ray sources and remnants of massive metal-poor stars Mapelli, M.; Ripamonti, E.; Zampieri, L.; Colpi, M.; Bressan, A. Abstract. Massive metal-poor stars might form massive stellar black holes (BHs), with mass 25 <= m_BH_/M_sun_ <= 80, via direct collapse. We derive the number of massive BHs (N_BH_) that are expected to form per galaxy through this mechanism. Such massive BHs might power most of the observed ultra-luminous X-ray sources (ULXs). We select a sample of 64 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 ULXs per galaxy (N_ULX_) in this sample. We discuss the dependence of our model on the SFR and on the metallicity. The SFR is found to be crucial, consistently with previous studies. The metallicity plays a role in our model, since a lower metallicity enhances the formation of massive BHs. Consistently with our model, the data indicate that there might be an anticorrelation between N_ULX_, normalized to the SFR, and the metallicity. A larger and more homogeneous sample of metallicity measurements is required, in order to confirm our results. Key words: black hole physics, galaxies: starburst, X-rays: binaries, X-rays: galaxies
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