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Abstract: We construct a systematic survey of extragalactic \gamma-ray sky at theenergies above 100 GeV using the data of Fermi telescope. Such survey has notbeen previously done by the ground-based Cherenkov gamma-ray telescopes whichhave, contrary to Fermi, narrow field of view. We study a map of arrivaldirections of the highest energy photons detected by Fermi at Galacticlatitudes |b| > 10 degrees and search for significant point source likeexcesses above the diffuse Galactic and extragalactic \gamma-ray backgrounds.We identify eight significant point source like excesses in this map. Seven ofthe eight sources are known TeV blazars. The previously unknown source isidentified with a head-tail radio galaxy IC 310, situated in Perseus cluster ofgalaxies. The source is detected with significance 6 sigma above 30 GeV. Weidentify two possible scenaria for gamma-ray emission from this source. Onepossibility is that emission originates from the base of relativistic outflowfrom the active nucleus, as in the BL Lacs and FR I type radio galaxies.Otherwise gamma-ray photons could be produced at the bow shock formed in resultof fast motion of the galaxy through the intracluster medium. The two modelscould be distinguished via the study of variability of the \gamma-ray signal.



Autor: A.Neronov, D.V.Semikoz, Ie.Vovk

Fuente: https://arxiv.org/







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