Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ppsn.book.....l&link_type=abstract
NASA Tech. Memo., NASA-TM--80624, 39 p.
Astronomy and Astrophysics
Astronomy
8
Active Galactic Nuclei, Black Holes (Astronomy), Compton Effect, Gamma Rays, Pair Production, Seyfert Galaxies, Background Radiation, Bursts, High Temperature Plasmas, Protons, X Ray Spectra
Scientific paper
A consistent theoretical interpretation is given for the suggestion that a steepening of the spectrum between X-ray and gamma ray energies may be a general, gamma-ray characteristic of Seyfert galaxies, if the diffuse gamma ray spectrum is considered to be a superposition of unresolved contributions, from one or more classes of extragalactic objects. In the case of NGC 4151, the dominant process is shown to be Penrose Compton scattering in the ergosphere of a Kerr black hole, assumed to exist in the Seyfert's active galactic nucleus.
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