Disk-corona interactions in soft spectral states of black hole binaries

Details Disk-corona interactions in soft spectral states of black hole binaries Disk-corona interactions in soft spectral states of black hole binaries

2000-11-06

arxiv.org/abs/astro-ph/0011116v1

2001, ApSSS, 276, 169

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures. To be published in `Proceedings of the Third Microquasar Workshop: Granada Workshop on Galactic relativist

Scientific paper

Re-analysis of some archival X-ray data of black hole binaries in soft spectral states is presented. Results of detailed spectral fitting, including proper physical description of the X-ray reprocessed component, indicate that in most cases the soft, thermal disk emission cannot be described by a simple multi-color blackbody model. Additional Comptonization of those seed photons provides an acceptable description of the soft component, implying a presence of a warm (kT~1 keV), mildly optically thick (tau~10) phase of accreting plasma. Combined spectral/temporal analysis of GS 1124-68 during 'flip-flop' transitions in Very High State suggests that the optically thick accretion flow can proceed in (at least) two modes giving the same time-integrated behaviour (i.e. energy spectra) but very different timing behaviour.

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