Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..106e&link_type=abstract
Astrophysical Journal, Part 1, vol. 232, Aug. 15, 1979, p. 106-112.
Astronomy and Astrophysics
Astrophysics
36
Energetic Particles, Galactic Nuclei, Galactic Radiation, Neutrinos, Active Galactic Nuclei, Active Galaxies, Gamma Rays, Infrared Radiation, Point Sources, Proton Scattering, Seyfert Galaxies
Scientific paper
The powerful infrared emission from active galactic nuclei may be driven, directly or indirectly, by nonthermal processes, in which case the power of high-energy particle production may be as high as the IR luminosity. The nuclei of active galaxies contain, on various scales, enough matter to stop high-energy protons before they diffuse out of the nuclear region via pion-producing collisions. Thus the luminosity of the nucleus in high-energy neutrinos (at least about 1 TeV) (the primary decay product of charged pions) may in turn be comparable to the total power radiated by the nucleus. If such a hypothesis is true, then many active galactic nuclei may be detectable as point sources in high-energy neutrinos with the neutrino 'telescopes' that are being discussed. The overall cosmic neutrino background due to active galaxies may be orders of magnitude above the detection threshold.
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