期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 345, 期 2, 页码 639-649出版社
WILEY-BLACKWELL
DOI: 10.1046/j.1365-8711.2003.06967.x
关键词
accretion, accretion discs; black hole physics; binaries : general; stars : early-type; stars : winds, outflows; galaxies : Seyfert
We present soft X-ray spectroscopy of the black hole binary LMC X-3 from the XMM-Newton Reflection Grating Spectrometer. The observations span the full range of spectral states seen in LMC X-3. The spectra are completely dominated by continuum emission, and the neutral absorbing column measured from the OI edge (N(H) = 3.8(-0.7)(+0 8) x 10(20) cm(-2)) is consistent with the Galactic interstellar column density towards LMC X-3. We find no evidence for variability of the neutral absorbing column. We also constrain the ionized column density using the upper limits to the equivalent width of the OII-O VIII K- shell resonance lines: we find that the equivalent hydrogen column density of gas in which O is partially ionized is < 8 x 10(20) cm(-2). From this upper limit we can rule out a line-driven stellar wind as the power source for the X-ray emission of LMC X-3 except when it is faint. At wavelengths longward of the peak emission the spectral shape is well described by a multitemperature disc-blackbody spectrum; the power-law component, which dominates at shorter wavelengths, does not continue longward of the disc-blackbody peak. This implies that the multitemperature disc-blackbody component supplies the seed photons that are Compton upscattered in the hot corona, consistent with the standard paradigm for black hole X-ray binary spectral states.
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