Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.1513s&link_type=abstract
American Astronomical Society, HEAD meeting #8, #15.13; Bulletin of the American Astronomical Society, Vol. 36, p.928
Astronomy and Astrophysics
Astronomy
Scientific paper
We present X-ray spectral, spatial, and variability distributions for 154 discrete non-nuclear Ultra-Luminous X-ray (ULX) sources identified in 82 galaxy observations obtained from the Chandra/ACIS archive. Correlations with host galaxy properties confirm the number and total X-ray luminosity of the ULXs are associated withrecent star formation and with galaxy merging and interactions. The large number of ULXs in star-forming galaxies suggest they originate in a young but short-lived population such as the high-mass X-ray binaries with a smaller contribution (based on spectral slope) from recent supernovae. The number of ULXs in elliptical galaxies scales with host galaxy mass and can be explained most simply as the high-luminosity end of the low-mass X-ray binary population. Comparison of the cumulative X-ray luminosity functions of the ULXs to Chandra Deep Field results suggests 25 background objects including 14 the sample of spiral galaxies and 44 galaxies implying the elliptical galaxy ULX population is severely compromised by background active galactic nuclei.
Ghosh Kajal K.
Swartz Douglas A.
Tennant Allyn F.
Wu Ke
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