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    High-energy cosmic rays from compact galactic star clusters: Particle fluxes and anisotropy

    High-energy cosmic rays from compact galactic star clusters: Particle fluxes and anisotropy


    Abstract It has been shown that supernova blast waves interacting with winds from massive stars in compact star clusters may be capable of producing cosmic-ray (CR) protons to above 10 17  eV. We give a brief description of the colliding-shock-flow mechanism and look at generalizations of the diffusion of ∼100 PeV CRs in the turbulent galactic magnetic field present in the galactic disk. We calculate the temporal evolution of the CR anisotropy from a possible distribution of young compact massive star clusters assuming the sources are intermittent on time scales of a few million years, i.e., comparable to their residence time in the Milky Way. Within the confines of our model, we determine the galactic/extra-galactic fraction of high-energy CRs resulting in anisotropies consistent with observed values. We find that galactic star clusters may contribute a substantial fraction of ∼100 PeV CRs without producing anisotropies above observed limits.

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    Titel :

    High-energy cosmic rays from compact galactic star clusters: Particle fluxes and anisotropy

    Beteiligte:
    Bykov, A.M. (Autor:in) / Kalyashova, M.E. (Autor:in) / Ellison, D.C. (Autor:in) / Osipov, S.M. (Autor:in)
    Erschienen in:

    Advances in Space Research ; 64 , 12 ; 2439-2444

    Erscheinungsdatum :

    2019-06-03

    Format / Umfang :

    6 pages

    ISSN :

    0273-1177

    DOI :

    https://doi.org/10.1016/j.asr.2019.06.005

    Medientyp :

    Aufsatz (Zeitschrift)

    Format :

    Elektronische Ressource

    Sprache :

    Englisch

    Schlagwörter :

    Acceleration of particles , ISM: cosmic rays , Galactic clusters , Magnetohydrodynamics (MHD) , Shock waves , Turbulence

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