Cosmic rays from active galactic nuclei

Abstract

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 $10^{18}$ eV the overall energy spectrum of CRs, produced during the AGN evolution and released in the intergalactic space, has the form $N\propto {\epsilon }^{-\gamma }$, with $\gamma \approx 2.6$, which extends up to ${\epsilon }_{max}\sim 10^{20}$ 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.

9 pages, Accepted for publication in ApJL

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• The future of gamma-ray astronomy
• Radio Quiet AGNs as Possible Sources of Ultra-high Energy Cosmic Rays
• Propagation of Ultra-High-Energy Cosmic Ray Nuclei in Cosmic Magnetic Fields and Implications for Anisotropy Measurements
• Composition of cosmic rays accelerated in active galactic nuclei
• Transport of Protostellar Cosmic Rays in Turbulent Dense Cores
• Evolution of non-thermal emission from shell associated with AGN jets
• Fossil shell in 3C 84 as TeV $\gamma$-ray emitter and cosmic-ray accelerator
• Status of the Yakutsk air shower array and future plans
• Systematic Survey of the Correlation between Northern HECR Events and SDSS Galaxies
• Diffuse high energy neutrinos and cosmic rays from hyperflares of soft-gamma repeaters
• Constraining the baryon loading factor of AGN jets: implication from the gamma-ray emission of the Coma cluster
• Molecular line ratio diagnostics and gas kinematics in the AGN host Seyfert galaxy NGC 5033