Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.233..739z&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 233, Aug. 15, 1988, p. 739-758.
Astronomy and Astrophysics
Astronomy
15
Accretion Disks, Background Radiation, Black Holes (Astronomy), Compton Effect, Cosmic X Rays, Pair Production, Cyclotron Radiation, Interstellar Magnetic Fields, Red Shift, Stellar Spectra
Scientific paper
Thermal Comptonization and e(+)e(-) pair production in high-viscosity black-hole accretion flows are modeled. It is assumed that magnetic fields are in equipartition with the energy density of the flow and that cyclotron radiation is the major source of seed soft photons. The electrons are assumed to receive a constant fraction of the gravitational energy. It is found that the resulting spectra have a constant X-ray energy spectral index for specified accretion rates. The spectra are cut off above about 150 keV. Such spectra closely resemble that of the residual cosmic X-ray background (after subtraction of the contributions of the known classes of extragalactic sources) if the background originated at a redshift of about 4-5. Thus, the residual cosmic background can be explained by an early population of active galaxies emitting thermal Comptonized spectra, as originally suggested by Leiter and Boldt (1982).
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