The Multi-Messenger Approach to High-Energy Gamma-Ray Sources 2007
DOI: 10.1007/978-1-4020-6118-9_19
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Fermi acceleration in astrophysical jets

Abstract: We consider the acceleration of energetic particles by Fermi processes (i.e., diffusive shock acceleration, second order Fermi acceleration, and gradual shear acceleration) in relativistic astrophysical jets, with particular attention given to recent progress in the field of viscous shear acceleration. We analyze the associated acceleration timescales and the resulting particle distributions, and discuss the relevance of these processes for the acceleration of charged particles in the jets of AGN, GRBs and mic… Show more

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Cited by 13 publications
(11 citation statements)
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“…From a theoretical point of view, the particle acceleration timescale for a particle of energy E (predicted by the diffuse shock acceleration theory 29 , 30 ) strongly depends on the shock speed. It can be estimated by 31 , 32 where is the spatial diffusion coefficient of the particle, is the particle's Larmor radius, c is the speed of light, B is the magnetic field near the shock front, and represents the deviation of the diffusion coefficient from the “Bohm diffusion”. This study considers it as the acceleration efficiency.…”
Section: Resultsmentioning
confidence: 99%
“…From a theoretical point of view, the particle acceleration timescale for a particle of energy E (predicted by the diffuse shock acceleration theory 29 , 30 ) strongly depends on the shock speed. It can be estimated by 31 , 32 where is the spatial diffusion coefficient of the particle, is the particle's Larmor radius, c is the speed of light, B is the magnetic field near the shock front, and represents the deviation of the diffusion coefficient from the “Bohm diffusion”. This study considers it as the acceleration efficiency.…”
Section: Resultsmentioning
confidence: 99%
“…Всi вони мають центральну активну область, один або два джети, якi закiнчуються радiовухами. В цих областях декiлька механiзмiв прискорення можуть дiяти паралельно [9]. Зокрема, процеси Фермi першого порядку можуть вiдбуватися бiля фронтiв ударних хвиль, iндуктивне прискорення -у релятивiстських струменях, а стохастичне прискорення, ймовiрно, вiдбувається у радiовухах [4,6,11].…”
Section: вступunclassified
“…Всi вони мають центральну активну область, один або два джети, якi закiнчуються радiовухами. В цих областях декiлька механiзмiв прискорення можуть дiяти паралельно [12]. Зокрема, процеси Фермi першого порядку можуть вiдбуватися бiля фронтiв ударних хвиль, iндуктивне прискорення -у релятивiстських струменях, а стохастичне прискорення, ймовiрно, вiдбувається у радiовухах [8,10,13].…”
Section: вступunclassified