AbstractX-ray observations indicate that the Galactic black hole Sgr A is inactive now, however, we suggest that Sgr A can become active when a captured star is tidally disrupted and matter is accreted into the black hole. Consequently the Galactic black hole could be a powerful source of relativistic protons with a characteristic energy ∼1052erg per capture. The diffuse GeV and TeV γ-rays emitted in the direction of the Galactic Center (GC) are the direct consequences of p–p collisions of such relativistic protons ejected by very recent capture events occurred 105 yr ago. On the other hand, the extended electron-positron annihilation line emission observed from GC is a phenomenon related to a large population of thermalized positrons, which are produced, cooled down and accumulated through hundreds of past capture events during a period of ∼107 yr. In addition to explaining GeV, TeV and 511keV annihilation emissions we also estimate the photon flux of several MeV resulting from in-flight annihilation process.


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    Titel :

    High energy radiation from the direction of the galactic black hole Sgr A


    Beteiligte:
    Cheng, K.S. (Autor:in) / Chernyshov, D.O. (Autor:in) / Dogiel, V. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 42 , 3 ; 538-543


    Erscheinungsdatum :

    2007-04-26


    Format / Umfang :

    6 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





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