The demographics of ultraluminous X-ray sources

Details The demographics of ultraluminous X-ray sources The demographics of ultraluminous X-ray sources

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011an....332..341s&link_type=abstract

Astronomische Nachrichten, Vol.332, Issue 4, p.341

Astronomy and Astrophysics

Astronomy

Catalogs, Galaxies: General, Surveys, X-Rays: Binaries, X-Rays: Galaxies

Scientific paper

Results of recent statistical studies of the population of ultraluminous X-ray sources are presented. Special emphasis is placed on the outcome of a complete survey of 140 nearby galaxies hosting 114 ULXs. It is shown that ULXs are preferentially associated with young star-forming regions but not necessarily with massive young clusters, that ULXs occur at a higher rate (per unit mass) in dwarf galaxies compared to giant galaxies and that ULXs rarely occur in galactic halos. If an upper limit to the luminosity of ULXs exists, then it must be above several times 1040 erg s-1 in the X-ray band. The luminosity function is still too sparsely sampled above this luminosity for a more definitive statement to be made.

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