Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..431..129d&link_type=abstract
Accretion processes in astrophysical systems: Some like it hot! - eigth astrophysics conference. AIP Conference Proceedings, Vo
Astronomy and Astrophysics
Astrophysics
Black Holes, Accretion And Accretion Disks, Radiative Transfer, Scattering
Scientific paper
We discuss the spectral states of Galactic Black Holes Candidates (GBHC) within the context of a magnetically structured corona model, in which magnetic flares result from reconnection of flux tubes rising from the underlying accretion disk due to magnetic buoyancy. Using a simple geometrical representation, we have shown that the hard X-ray state in GBHC can be produced by flares located high above the underlying disk via Comptonization of the cyclo-synchrotron radiation. The soft state is due to flaring of active regions close to the disk. The soft blackbody component is the result of re-radiation from the disk of X-rays and the hard tail is produced via Comptonization of such a soft component. By varying the typical scale size and scale height of the dissipative regions, we have qualitatively reproduced the spectra for all of the five states observed in GX339-4.
Celotti Annalisa
Di Matteo Tiziana
Fabian Andrea C.
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