Physics
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..apr.a1204t&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, April 18-21, 1997, abstract #A12.04
Physics
Scientific paper
Observations of Galactic and Extragalactic Black Hole Candidates show that their spectra can be fitted by the thermal Comptonization spectra in the hard state and two components in the soft state. The first component is a black body shape spectrum with colour temperature a fraction of keV and tens of eV for galactic and extragalactic sources respectively. The second component is an extended power-law with spectral index between 1 and 2. We formulate the problem of spectral formation of Comptonized spectra in the presence of thermal and bulk motion. The general relativistic exact integrodifferential transfer equation describing the interaction of low energy photons with a Maxwellian distribution of hot electrons has be analyzed on a Schwarzschild black hole background. It is proven that the resulting occupation photon number always exhibits a power law behaviour. In the soft state when the disk luminosity is high the temperature of emission region is low. In the limit of low plasma temperature (of order a few keV) the theoretical spectrum consists of two components like the observed spectrum. The soft input photons escaping without any significant energy change and a power law that extends to high energies. The spectral index is in the range 1-2 depending on the mass accretion rate. The extended power law is the result of upscattering of soft disk photons in the bulk flow which takes place in the vicinity of the black hole.
Titarchuk Lev
Zannias Thomas
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