Andrei Bykov, Neil Gehrels, Henric Krawczynski, Martin Lemoine, Guy Pelletier, Martin Pohl
In this review we confront the current theoretical understanding of particle acceleration at relativistic outflows with recent observational results on various source classes thought to involve such outflows, e.g. gamma-ray bursts, active galactic nuclei, and pulsar wind nebulae. We highlight the possible contributions of these sources to ultra-high-energy cosmic rays.
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http://arxiv.org/abs/1205.2208
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