Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...363l...1z&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 363, Nov. 1, 1990, p. L1-L4. Research supported by the Royal Soci
Astronomy and Astrophysics
Astrophysics
95
Active Galactic Nuclei, Compton Effect, Electron-Positron Pairs, X Ray Spectra, Accretion Disks, Astronomical Spectroscopy, Background Radiation, Gamma Ray Spectra
Scientific paper
It is shown here that reprocessing of radiation fron nonthermal pair cascades by cold material in the central parts of active galactic nuclei (AGN) gives rise to X-ray and gamma-ray spectra that satisfy current observational constraints. An average 1-30 keV X-ray spectral index alpha(x) of about 0.7 in the compact range 30-300 is obtained for a wide range of Lorentz factors of the injected electrons. The gamma-ray spectra are steep, with alpha(gamma) about two, and satisfy the observational constraints. Radiation from pair cascades exhibits steep power law decreases in soft X-rays similar to those observed in AGN. The overall picture is consistent with AGN having an accretion disk which intercepts and reprocesses a substantial fraction of the nonthermal continuum incident upon it from above and below.
Done Chris
Fabian Andrea C.
George Ian Michael
Ghisellini Gabriele
Svensson Roland
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