Data Centre for Astrophysics
Astronomy Department of the University of Geneva
ISDC Seminar

Tuesday, 23 June 2009 at 14:00

Giulia Vannoni
CEA, Saclay

Diffusive shock acceleration in radiation dominated environments

Abstract. A generic framework will be presented to study self-consistently the acceleration of particles at non-relativistic shocks in presence of strong radiative losses. The effects of energy losses on the shape of the resulting particle spectrum will be reviewed for several astrophysical environments where the radiation pressure dominates over the magnetic pressure. I will present results for both electrons undergoing intense inverse Compton losses, and show the impact due to the changing features of the inverse Compton scattering from the Thomson to the Klein-Nishina regime, on the spectrum of accelerated electrons and their broadband emission; and protons accelerated in galaxy clusters losing energy in the interaction with the Cosmic Microwave Background radiation. The secondary products from pair production and photomeson processes interact with the same photon field and the background magnetic field, producing broadband electromagnetic radiation from radio to gamma-rays.

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