Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-07-27
Phys.Rev. D64 (2001) 123004
Physics
High Energy Physics
High Energy Physics - Phenomenology
To appear in Phys. Rev. D, reference added
Scientific paper
10.1103/PhysRevD.64.123004
In this article we examine the hypothesis that the highest energy cosmic rays are complex nuclei from extragalactic sources. Under reasonable physical assumptions, we show that the nearby metally rich starburst galaxies (M82 and NGC 253) can produce all the events observed above the ankle. This requires diffusion of particles below $10^{20}$ eV in extragalactic magnetic fields $B \approx 15$ nG. Above $10^{19}$ eV, the model predicts the presence of significant fluxes of medium mass and heavy nuclei with small rate of change of composition. Notwithstanding, the most salient feature of the starburst-hypothesis is a slight anisotropy induced by iron debris just before the spectrum-cutoff.
Anchordoqui Luis
Goldberg Haim
Reucroft Stephen
Swain John
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