Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-12-08
Astronomy and Astrophysics
Astrophysics
5 pages, 2 figures, to appear in the Proceedings of the 2003 GRB Conference, Santa Fe, NM
Scientific paper
10.1016/j.nuclphysbps.2004.08.01
A model for high-energy (>10^14 eV) cosmic rays (HECRs) from galactic and extragalactic gamma-ray bursts (GRBs) is summarized. Relativistic outflows in GRBs are assumed to inject power-law distributions of CR protons and ions to the highest (>10^20 eV) energies. A diffusive propagation model for HECRs from a single recent GRB within 1 kpc from Earth explains the CR spectrum near and above the knee. The CR spectrum at energies above 10^18 eV is fit with a component from extragalactic GRBs. By normalizing the energy injection rate to that required to produce the CR flux from extragalactic sources observed locally, we determine the amount of energy a typical GRB must release in the form of nonthermal hadrons. Our interpretation of the HECR spectrum requires that GRBs are hadronically dominated, which would be confirmed by the detection of HE neutrinos from GRBs.
Atoyan Armen
Dermer Carles D.
Wick Stuart Dean
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