Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rspta.301..577d&link_type=abstract
(Royal Society, Discussion on Gamma-Ray Astronomy, London, England, Nov. 27, 28, 1980.) Royal Society (London), Philosophical Tr
Astronomy and Astrophysics
Astronomy
4
Astronomical Spectroscopy, Extragalactic Radio Sources, Gamma Ray Astronomy, Seyfert Galaxies, Active Galactic Nuclei, Active Galaxies, Black Holes (Astronomy), Compton Effect, Cos-B Satellite, Energy Spectra, Quasars, Radio Galaxies
Scientific paper
In view of the very small number of extragalactic objects that have been detected so far as gamma-ray energies, the considered discussion centers on the mechanisms for the production of gamma-rays in the nuclei of active galaxies. Seyfert galaxies and the significance of gamma-ray emission for studying them are considered, taking into account the general properties of Seyferts, a list of X-ray Seyferts, the correlation between the X-ray flux and emission at other wavelengths, the galaxy NGC 4151, and X- and gamma-ray observations of NGC 4151. Other X- and gamma-ray active galaxies are also examined, giving attention to quasars, BL Lacertae objects, and NGC 5128. A description is presented of sources of power in X- and gamma-active galactic nuclei, taking into consideration Compton models, and massive black hole models. All of the observations of extragalactic objects at gamma-ray wavelengths indicate that a break must occur in the spectrum at low gamma-ray energies.
Dean Anthony J.
Ramsden David
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