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Cosmic Rays from Active Galactic Nuclei

Cosmic-ray (CR) acceleration at the shock created by the expanding cocoons around active galactic nuclei (AGNs) is studied. It is shown that above the energy 1018 eV the overall energy spectrum of CRs, produced during the AGN evolution and released in the intergalactic space, has the form N ∝ ϵ−γ, with γ ≈ 2.6, which extends up to ϵmax ∼ 1020 eV. It is concluded that cocoons shocks have to be considered as a main source of extragalactic CRs, which together with Galactic supernova remnants provide the observed CR spectrum.