The application of slim disk models to ULX: The case of M33 X-8
Cappelluti, N.; Grandi, P.; Rodriguez, J.; Foschini, L.; Ho, L. C.; Di Cocco, G.; Malaguti, G.; Courvoisier, T. J. -L.; Ebisawa, K.; Palumbo, G. G. C.; Kawaguchi, T.
Italy, United States, Switzerland, Japan, France
Abstract
A comparative XMM-Newton archival data spectral study of the ultraluminous X-ray source (ULX) M33 X-8 has been performed by using both the standard disk model and the newly developed slim disk models. The results of this analysis tend to confirm the hypothesis that M33 X-8 is an X-ray binary with a stellar-mass black hole accreting at super-Eddington rate.