Extragalactic Shocks as Cosmic Accelerators

Details Extragalactic Shocks as Cosmic Accelerators Extragalactic Shocks as Cosmic Accelerators

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...1e...4m&link_type=abstract

Cosmic Particle Acceleration, 26th meeting of the IAU, Joint Discussion 1, 16-17 August, 2006, Prague, Czech Republic, JD01, #4

Physics

Scientific paper

It is quite well established that shocks accelerate particles via Fermi mechanism. We will review various extragalactic sources, ranging from Gamma-Ray Bursts and jets of Active Galactic Nuclei to Large-Scale Structure shocks. We discuss common features of these seemingly different shocks and address how they affect particle acceleration. Interestingly, some recent studies indicate that Fermi acceleration in relativistic shocks (and GRBs, in particular) shock faces severe difficulties. We will address this issue and demonstrate that the "observed" power-law distribution of accelerated electrons may have nothing to do with Fermi acceleration, but rather associated with micro-physics of collisionless shocks. Finally, we address constraints on the maximum energy of ultra-high-energy cosmic rays.

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