Maximum cosmic ray energies and the shock acceleration mechanism

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Rays, Astronomy, Shock Waves, Magnetic Fields, Diffusion, Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays, Atomic And Molecular Data, Spectra, And Spectral Parameters, Planetary Bow Shocks, Interplanetary Shocks, Gravitational Radiation, Magnetic Fields, And Other Observations, Convection, Turbulence, And Diffusion

Scientific paper

The Ultra High Energy Cosmic Rays have a flux which is about one particle per square km per century, at an energy of ~=1020 eV. Shocks in astrophysical environments, such as in jets of Active Galactic Nuclei, seem to be the sources of these cosmic rays. In this selected talk I will briefly present and discuss the efficiency of the first order Fermi acceleration mechanism in extragalactic astrophysical shocks, focusing at the highest cosmic ray energies.

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