X-rays and Gamma-rays from active galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Active Galaxies, Annihilation Reactions, Gamma Ray Astronomy, Pair Production, Seyfert Galaxies, X Ray Astronomy, Bl Lacertae Objects, Emission Spectra, Gamma Ray Spectra, Luminosity, Photons, Quasars, X Ray Spectra

Scientific paper

Photon-photon pair production in active galaxies is considered, and the concept of the annihilation efficiency, the efficiency of the conversion of continuum luminosity of greater than 511 keV into positron annihilation luminosity, is introduced. Equations that give the source's annihilation luminosity and 511-keV flux as a function of its size, continuum luminosity and distance are developed. These are applied to the available X-ray and gamma-ray data on active galaxies in order to make specific predictions. Efficiencies as high as over 6 percent and fluxes up to 0.0008 ph/sq cm s result. While the latter are below present limits, they are within the reach of advanced instruments now in development.

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