First- and second-order Fermi acceleration in thick relativistic shocks

2012 ◽  
Author(s):  
A. Meli
Keyword(s):  
Second Order ◽  
Fermi Acceleration ◽  
Relativistic Shocks

Combined first- and second-order Fermi acceleration in cometary environments

1989 ◽  
Vol 94 (A11) ◽  
pp. 15011 ◽  
Author(s):  
T. I. Gombosi ◽  
K. Lorencz ◽  
J. R. Jokipii
Keyword(s):  
Second Order ◽  
Fermi Acceleration

scholarly journals Active Galactic Nuclei: Jets as the Source of Hadrons and Neutrinos

2014 ◽  
Vol 1 (1) ◽  
pp. 269-273
Author(s):  
Athina Meli ◽  
Paolo Ciarcelluti
Keyword(s):  
Active Galactic Nuclei ◽  
Gamma Ray ◽  
Galactic Nuclei ◽  
Cosmic Ray ◽  
High Energy ◽  
Plasma Jets ◽  
Shock Acceleration ◽  
Fermi Acceleration ◽  
Acceleration Mechanism ◽  
Relativistic Shocks

Active galactic nuclei are extragalactic sources, and their relativistic hot-plasma jets are believed to be the main candidates of the cosmic-ray origin, above the so-called knee region of the cosmic-ray spectrum. Relativistic shocks, either single or multiple, have been observed or been theorized to be forming within relativistic jet channels in almost all active galactic nuclei sources. The acceleration of non-thermal particles (e.g. electrons, protons) via the shock Fermi acceleration mechanism, is believed to be mainly responsible for the power-law energy distribution of the observed cosmic-rays, which in very high energies can consequently radiate high energy gamma-rays and neutrinos, through related radiation channels. Here, we will focus on the primary particle (hadronic) shock acceleration mechanism, and we will present a comparative simulation study of the properties of single and multiple relativistic shocks, which occur in AGN jets. We will show that the role of relativistic (quasi-parallel either quasi-perpendicular) shocks, is quite important since it can dramatically alter the primary CR spectral indices and acceleration eciencies. These properties being carried onto gamma-ray and neutrino radiation characteristics, makes the combination of them a quite appealing theme for relativistic plasma and shock acceleration physics, as well as observational cosmic-ray, gamma-ray and neutrino astronomy.

On the Efficiency of Fermi Acceleration at Relativistic Shocks

2006 ◽  
Vol 645 (2) ◽  
pp. L129-L132 ◽  
Author(s):  
Martin Lemoine ◽  
Guy Pelletier ◽  
Benoît Revenu
Keyword(s):  
Fermi Acceleration ◽  
Relativistic Shocks

scholarly journals THE EFFICIENCY OF SECOND-ORDER FERMI ACCELERATION BY WEAKLY COMPRESSIBLE MAGNETOHYDRODYNAMIC TURBULENCE

2013 ◽  
Vol 777 (2) ◽  
pp. 128 ◽  
Author(s):  
Jacob W. Lynn ◽  
Eliot Quataert ◽  
Benjamin D. G. Chandran ◽  
Ian J. Parrish
Keyword(s):  
Second Order ◽  
Fermi Acceleration ◽  
Magnetohydrodynamic Turbulence ◽  
Weakly Compressible
Sign in / Sign up

Export Citation Format

Share Document