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Original Paper

Remnants of massive metal-poor stars: Viable engines for ultra-luminous X-ray sources

  1. M. Mapelli1,*,
  2. E. Ripamonti1,
  3. L. Zampieri2,
  4. M. Colpi1

Article first published online: 28 APR 2011

DOI: 10.1002/asna.201011511

Issue

Astronomische Nachrichten

Astronomische Nachrichten

Special Issue: Ultra-Luminous X-ray sources and Middle Weight Black Holes

Volume 332, Issue 4, pages 414–417, May 2011

Additional Information

How to Cite

Mapelli, M., Ripamonti, E., Zampieri, L. and Colpi, M. (2011), Remnants of massive metal-poor stars: Viable engines for ultra-luminous X-ray sources. Astron. Nachr., 332: 414–417. doi: 10.1002/asna.201011511

Author Information

  1. 1

    Physics Department ‘G. Occhialini’, University of Milano-Bicocca, Piazza della Scienza 3, I-20126 Milano, Italy

  2. 2

    INAF-Osservatorio astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy

*Physics Department ‘G. Occhialini’, University of Milano-Bicocca, Piazza della Scienza 3, I-20126 Milano, Italy

Publication History

  1. Issue published online: 28 APR 2011
  2. Article first published online: 28 APR 2011
  3. Manuscript Accepted: 5 JAN 2011
  4. Manuscript Received: 5 DEC 2010

Funded by

  • INAF grant. Grant Number: PRIN-2007-26

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Keywords:

  • black hole physics;
  • galaxies: starburst;
  • X-rays: binaries;
  • X-rays: galaxies

Abstract

Massive metal-poor stars might end their life by directly collapsing into massive (≈25–80 M⊙) 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 NBH correlates with the number of observed ultra-luminous X-ray sources (ULXs) per galaxy math image in this sample. We discuss the dependence of NULX and of NBH on the SFR and on the metallicity (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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