A semi-analytical approach to non-linear shock acceleration

TL;DR: In this paper, the authors investigated scatter-free acceleration for a test particle thrusted by a moving magnetized cloud in the presence of the uniform interstellar magnetic field and found that depending on the orientation of the background magnetic field, three different scenarios occur for the interacting particle.

TL;DR: In this paper, a new analytic scaling of the cut-off frequency of synchrotron radiation from active galactic nucleus (AGN) jets that are nonuniformly filled with many filaments is proposed.

TL;DR: This study investigates the contribution of the Cygnus bubble to the galactic cosmic ray spectrum and diffuse γ-ray emissions, finding minimal contribution to Earth's CR spectrum, dominant emissions in the Cygnus region, and structural fluctuations due to the local CR halo.

TL;DR: In this article, the central idea of diffusive shock acceleration is presented from microscopic and macroscopic viewpoints; applied to reactionless test particles in a steady plane shock, the mechanism is shown to produce a power law spectrum in momentum with a slope which, to lowest order in the ratio of plasma to particle speed, depends only on the compression in the shock.

TL;DR: In this paper, a review of the history and theory of particle acceleration is presented, paying particular attention to theories of parallel shocks which include the backreaction of accelerated particles on the shock structure, and the work that computer simulations, both plasma and Monte Carlo, are playing in revealing how thermal ions interact with shocks.

TL;DR: In this article, the authors present a simple model of nonlinear diffusive shock acceleration (also called first-order Fermi shock acceleration) that determines the shock modification, spectrum, and efficiency of the process in the plane-wave, steady state approximation as a function of an arbitrary injection parameter, η.

TL;DR: The first detection of TeV gamma-ray emission from a supernova remnant made with the CANGAROO 3.8 m Telescope was reported in this article, where the observed TeV Gamma-ray flux was $(2.4\pm 0.5(statistical) \pm 0.5(systematic) \times 10-12}$ cm$^{-2}$ s$-1}$ ($\ge 3.0\mm 0.9$ TeV) and $ (4.6 \pm 1.7\pm0.