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Ultra-luminous Supersoft X-ray Sources in Nearby Galaxies
2005
Proceedings of the International Astronomical Union
Chandra and XMM-Newton improve our understanding of X-ray populations in galaxies. In particular, there exists a class of ultra-luminous X-ray sources (ULXs) for which the observed luminosity is greater than 10 39 ergs s −1 . ULXs are of great interest since they represent a population of possible intermediate-mass black holes. While the spectra of majority of ULXs are similar to Galactic X-ray binaries, a few ULXs have very soft X-ray emission (kT = 50-100 eV) resembling supersoft X-ray
doi:10.1017/s1743921306008453
fatcat:6eslvg7iezfdxd2h2azwsdqzxm