TL;DR
This paper reviews particle acceleration mechanisms at supernova remnant shocks, emphasizing non-linear effects, magnetic field amplification, and observational signatures in X-ray and gamma-ray spectra, supporting SNRs as sources of Galactic cosmic rays.
Contribution
It provides a comprehensive overview of recent modeling advances in diffusive shock acceleration, highlighting the role of magnetic fields and neutrals, and discusses observational diagnostics like Balmer lines.
Findings
Non-linear effects significantly influence SNR shock spectra.
Magnetic field amplification enhances particle acceleration efficiency.
Balmer line observations help estimate shock properties and cosmic ray acceleration.
Abstract
We review the basic features of particle acceleration theory around collisionless shocks in supernova remnants (SNRs). We show how non linear effects induced by the back reaction of accelerated particles onto the shock dynamics are of paramount importance to support the hipotesys that SNRs are the factories of Galactic cosmic rays. Recent developments in the modeling of the mechanism of diffusive shock acceleration are discussed, with emphasis on the role of magnetic field amplification and the presence of neutrals in the circumstellar environment. Special attention will be devoted to observational consequences of non linear effects on the multi-wavelength spectrum of SNRs, with emphasis on X-ray and gamma-ray emission. Finally we also discuss how Balmer lines, detected from several young SNRs, can be used to estimate the shock dynamical properties and the efficiency of CR acceleration.
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