Role of the radiative stage for cosmic ray acceleration in SNRs

TL;DR

This paper investigates how the radiative stage in supernova remnants influences cosmic ray acceleration, showing that it leads to harder spectra at certain energies, especially for electrons.

Contribution

It introduces the role of the radiative stage in supernova remnants as a factor in cosmic ray acceleration, highlighting its impact on spectral hardening.

Findings

Hardening of cosmic ray spectra at 100-500 GeV due to radiative stage

More pronounced effects observed for cosmic ray electrons

Faster particle escape during the radiative stage enhances acceleration efficiency

Abstract

We consider diffusive shock acceleration in supernova remnants throughout their evolution including a radiative stage. It is found that a more efficient acceleration and fast exit of particles at the radiative stage results in the hardening of the source cosmic ray proton and electron spectra at energies $\sim 100-500$ GeV. The effect is stronger for cosmic ray electrons.