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Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/749

Title: Ultraluminous X-ray sources in external galaxies
Authors: King, Andrew R.
Davies, Melvyn B.
War, M.J.
Fabbiaon, G.
Elvis, M.
Issue Date: 10-May-2001
Publisher: IOP Publishing
Citation: Astrophysical Journal, 2001, 552 (2), pp.L109-L112
Abstract: We investigate models for the class of ultraluminous nonnuclear X-ray sources (i.e., ultraluminous compact X-ray sources [ULXs]) seen in a number of galaxies and probably associated with star-forming regions. Models in which the X-ray emission is assumed to be isotropic run into several difficulties. In particular, the formation of sufficient numbers of the required ultramassive black hole X-ray binaries is problematic, and the likely transient behavior of the resulting systems is not in good accord with observation. The assumption of mild X-ray beaming suggests instead that ULXs may represent a short-lived but extremely common stage in the evolution of a wide class of X-ray binaries. The best candidate for this is the phase of thermal-timescale mass transfer that is inevitable in many intermediate- and high-mass X-ray binaries. This in turn suggests a link with the Galactic microquasars. The short lifetimes of high-mass X-ray binaries would explain the association of ULXs with episodes of star formation. These considerations still allow the possibility that individual ULXs may contain extremely massive black holes.
DOI Link: http://dx.doi.org/10.1086/320343
ISSN: 0004-637X
eISSN: 1538-4357
Links: http://hdl.handle.net/2381/749
http://iopscience.iop.org/1538-4357/552/(...)
Version: Publisher Version
Status: Peer-reviewed
Type: Article
Rights: Copyright © 2001, The American Astronomical Society. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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