Ultraluminous X--ray Sources in External Galaxies

Details Ultraluminous X--ray Sources in External Galaxies Ultraluminous X--ray Sources in External Galaxies

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001tysc.confe1012k&link_type=abstract

Two Years of Science with Chandra, Abstracts from the Symposium held in Washington, DC, 5-7 September, 2001, meeting abstract. I

Physics

Black Hole And Neutron Star Binaries Normal Galaxies

Scientific paper

I consider models for the class of ultraluminous non-nuclear X-ray sources (ULXs) seen in a number of galaxies and probably associated with star-forming regions. While some individual ULXs could involve massive (> 105 Msolar) black holes emitting isotropically, this is not a promising model for the class. The assumption of mild X-ray beaming suggests instead that ULXs may represent a shortlived 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 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.

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