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2000MNRAS.314..183W - Mon. Not. R. Astron. Soc., 314, 183-198 (2000/May-1)
Thermal synchrotron radiation and its Comptonization in compact X-ray sources.
WARDZINSKI G. and ZDZIARSKI A.A.
Abstract (from CDS):
We then study the importance of Comptonization of thermal synchrotron radiation in compact X-ray sources. We first consider emission from hot accretion flows and active coronae above optically thick accretion discs in black hole binaries and active galactic nuclei (AGNs). We find that for plausible values of the magnetic field strength, this radiative process is negligible in luminous sources, except for those with hardest X-ray spectra and stellar masses. Increasing the black hole mass results in a further reduction of the maximum Eddington ratio from this process. Then, X-ray spectra of intermediate-luminosity sources, e.g. low-luminosity AGNs, can be explained by synchrotron Comptonization only if they come from hot accretion flows, and X-ray spectra of very weak sources are always dominated by bremsstrahlung. On the other hand, synchrotron Comptonization can account for power-law X-ray spectra observed in the low states of sources around weakly magnetized neutron stars.
Abstract Copyright: 2000, Royal Astronomical Society
Journal keyword(s): accretion, accretion discs - radiation mechanisms: thermal - gamma-rays: theory - X-rays: galaxies - X-rays: stars
Simbad objects: 8
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