Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.2301d&link_type=abstract
American Astronomical Society, HEAD meeting #8, #23.01; Bulletin of the American Astronomical Society, Vol. 36, p.948
Astronomy and Astrophysics
Astronomy
Scientific paper
A model is proposed for the origin of cosmic rays (CRs) from 1e14 eV/nucleon to the highest energies (>1e20 eV). GRBs are assumed to inject CR protons and ions into the interstellar medium of star-forming galaxies--including the Milky Way--with a power-law spectrum extending to a maximum energy 1e20 eV. The CR spectrum near the knee is fit with CRs trapped in the Galactic halo that were accelerated and injected by an earlier Galactic GRB. These CRs diffuse in the disk and halo of the Galaxy due to gyroresonant pitch-angle scattering with MHD turbulence in the Galaxy's magnetic field. Ultra-high energy CRs (UHECRs), with energies above the ankle energy at >3e18 eV, are assumed to propagate rectilinearly with their spectrum modified by photo-pion, photo-pair, and expansion losses. We fit the measured UHECR spectrum assuming comoving luminosity densities of GRB sources consistent with possible star formation rate histories of the Universe. Calculations show that 100 TeV to 100 PeV neutrinos could be detected several times per year from all GRBs with kilometer-scale neutrino detectors such as IceCube.
Atoyan Armen
Dermer Carles D.
Wick Stuart Dean
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