A&A 365, L267-L272 (2001)
XMM-Newton EPIC and RGS observations of LMC X-3K. Wu1,2, R. Soria1, M. J. Page1, I. Sakelliou1, S. M. Kahn3 and C. P. de Vries4.
1 Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, RH5 6NT, UK
2 Research Centre for Theoretical Astrophysics, School of Physics, University of Sydney, NSW 2006, Australia
3 Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USA
4 Space Research Organization of The Netherlands, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
(Received 2 October 2000 / Accepted 10 November 2000)
We report the results of preliminary analysis of the XMM-Newton EPIC and RGS observations of the candidate black-hole binary LMC X-3 between February and June 2000. The observations covered both the soft and the hard X-ray spectral states. The hard-state spectra were dominated by a power-law component with a photon index . The soft-state spectra consisted of a thermal component with a multi-colour disk temperature of keV and a power-law tail with . The model in which the X-rays from LMC X-3 in the high-soft state are powered by a strong stellar wind from a massive companion is not supported by the small line-of-sight absorption ( cm-2) deduced from the RGS data. The transition from the soft to the hard state appears to be a continuous process associated with the changes in the mass-transfer rate.
Key words: accretion, accretion disks -black hole physics -binaries: general -stars: early type -stars: winds, outflows -X-rays: general
Offprint request: K. Wu SIMBAD Objects
© ESO 2001