Radio evolution of supernova remnants including non-linear particle acceleration

Abstract

Supernova remnants (SNRs) are believed to accelerate particles up to high energies, at least reaching a few PeV, through the mechanism of diffusive shock acceleration (DSA). Detection of synchrotron radio emission from cosmic ray (CR) electrons supports this picture. We give preliminary results for the global radio emission evolution for SNRs, based on two-dimensional hydrodynamic simulations of SNRs evolving through a homogeneous ambient medium, coupled with particle acceleration and magnetic field amplification (MFA). We coupled a simple Blasi's semi-analytical model that deals with these non-linear effects in a quantitative way and changes hydrodynamics by means of an effective adiabatic index. We obtained the radio flux density increasing with time in the free expansion phase, achieving its peak value slightly before the beginning of the Sedov phase, and then decreasing during later phases.