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Recipes for ULX formation: necessary ingredients and garnishments

Published online by Cambridge University Press:  01 August 2006

Roberto Soria
Roberto Soria*
Affiliation:
Harvard-Smithsonian CfA, 60 Garden st, Cambridge, MA 02138, USA email: [email protected] MSSL, University College London, Holmbury St Mary, Dorking, RH5 6NT, UK
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Abstract

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We summarize the main observational features that seem to recur more frequently in the ULX population. We speculate that low metal abundance, and clustered star formation triggered by molecular cloud collisions are two fundamental physical requirements for ULX formation. In this scenario, most ULXs are formed from recent stellar processes, have black hole (BH) masses <100 M⊙, and do not require merger processes in super-star-clusters.

Keywords

Black hole physics – X-ray: binaries – galaxies: star clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S238: Black Holes from Stars to Galaxies – Across the Range of Masses , August 2006 , pp. 235 - 240
Copyright
Copyright © International Astronomical Union 2007

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