Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.0302k&link_type=abstract
American Astronomical Society, AAS Meeting #211, #03.02; Bulletin of the American Astronomical Society, Vol. 39, p.723
Astronomy and Astrophysics
Astronomy
Scientific paper
It has been suggested that ultraluminous X-ray sources (ULXs) are massive black hole X-ray binaries accreting at or near the Eddington limit. They often exhibit soft, apparently disc-dominated spectra similar to the high/soft state seen in Galactic black hole binaries. If this is the case, one would also expect to observe ULXs in the low/hard state. IC 10 X-1 is a black hole high-mass X-ray binary in the nearby dwarf starburst galaxy IC 10. Observations of eclipses have allowed for the determination of an orbital period, and radial velocity shifts have established mass limits of 23-34 solar masses, making it the most massive known stellar-mass black hole (Prestwich et al. 2007). Its X-ray spectrum is similar to the low/hard state of Galactic black hole binaries, though its X-ray luminosity is quite a bit higher. As such, IC 10 X-1 is a good candidate for being the low/hard state counterpart to the high/soft state ULXs.
Carpano S.
Kilgard Roy E.
Prestwich Andrea H.
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