Ultra-High-Energy Cosmic Rays from the Radio Lobes of AGNsReport as inadecuate



 Ultra-High-Energy Cosmic Rays from the Radio Lobes of AGNs


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In the past year, the HiRes and Auger collaborations have reported the discovery of a high-energy cutoff in the ultra-high energy cosmic-ray UHECR spectrum, and an apparent clustering of the highest energy events towards nearby active galactic nuclei AGNs. Consensus is building that such $\sim 10^{19}$-$10^{20}$ eV particles are accelerated within the radio-bright lobes of these sources, but it is not yet clear how this actually happens. In this paper, we report to our knowledge the first treatment of stochastic particle acceleration in such environments from first principles, showing that energies $\sim 10^{20}$ eV are reached in $\sim 10^6$ years for protons. However, our findings reopen the question regarding whether the high-energy cutoff is due solely to propagation effects, or whether it does in fact represent the maximum energy permitted by the acceleration process itself.



Author: F. Fraschetti; F. Melia

Source: https://archive.org/







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