Gamma rays and neutrinos as complementary probes in astrophysics

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astrophysics, Galactic Nuclei, Gamma Ray Astronomy, Neutrinos, Particle Acceleration, Active Galactic Nuclei, Astronomical Models, Black Holes (Astronomy), Cosmic Rays, Energetic Particles

Scientific paper

Gamma rays are good tracers of electron acceleration processes in active galactic nuclei (AGN), while neutrinos are unambiguous tracers of energetic protons, i.e., of cosmic rays. At high energies (E > 1 GeV), gamma rays from the more powerful AGN are likely to be degraded, and neutrinos provide a tracer of particle acceleration to higher energies. Thus, a dearth of high-energy gamma rays need not lead to an expectation of a low neutrino flux. A combination of gamma ray observations (1 - 103 MeV) and neutrino observations (≡1 TeV) is likely to permit discrimination between black-hole and spinar models.

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