A semianalytical method for calculating the parameters of the electromagnetic halos around extragalactic gamma-ray sources |
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| Authors: | S R Kel’ner D V Khangulyan F A Aharonian |
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| Institution: | (1) Moscow Engineering Physics Institute (State University), Kashirskoe shosse 31, Moscow, 115409, Russia;(2) Max Planck Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany |
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| Abstract: | The ultrahigh-energy (>20 TeV ) gamma rays emitted by active galactic nuclei can be absorbed in intergalactic space through the production of electron-positron pairs during their interaction with extragalactic background photon fields. The electrons and positrons produced by this interaction form an electromagnetic halo. We have studied the halo formation and calculated the halo radiation spectrum. The magnetic field in the halo formation region is assumed to be strong enough for the electron velocities to be isotropized. For such fields, the halo formation process can be described by the method of generations. We calculated the synchrotron and Compton backscattering radiation spectra for the total halo luminosity. We obtained the spatial distribution of the radiation for a point gamma-ray source. |
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| Keywords: | active galactic nuclei quasars and radio galaxies electromagnetic halo blazars background radiation |
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