UHECRs from the Radio Lobes of AGNs

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Fraschetti, F.
Melia, F.
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Abstract
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We report a stochastic mechanism of particle acceleration from first principles in an environment having properties like those of Radio Lobes in AGNs. We show that energies $\sim 10^{20}$ eV are reached in $\sim 10^6$ years for protons. Our results reopen the question regarding the nature of the high-energy cutoff in the observed spectrum: whether it is due solely to propagation effects, or whether it is also affected by the maximum energy permitted by the acceleration process itself.
Comment: 4 pages, 2 figures; talk given by F.F. at Conference "Challenges in Particle Astrophysics" (XXth Rencontres de Blois 2008)
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Astrophysics
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