Abstract

Diffusive shock acceleration theory predicts both: accelerated electrons and protons. Electrons cool via synchrotron radiation explaining the radio to optical continuum from low density hot spots in extragalactic radio jets. Relativistic protons immersed in this soft photon field produce extremely energetic photomesons (mainly pions) at a considerable rate. Moreover, the resulting photons from the pion-decay are degraded down to observable X- and γ-rays via an electromagnetic cascade. A case study of this natural mechanism for a sample of hot spots, viz. high surface-brightness regions at the working end of jets from Fanaroff-Riley type II galaxies or similar knots in jets, where diffusive shock accelaration has been shown to be consistent with observations, is presented.

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