Reacceleration of electrons in supernova remnants

TL;DR

This paper investigates how stochastic reacceleration of electrons by fast-mode turbulence downstream of supernova remnant shocks can explain observed radio spectral variations, showing that reacceleration can produce softer spectra over wide frequency ranges.

Contribution

It explicitly calculates the momentum diffusion coefficient for different turbulence types and demonstrates that fast-mode waves can significantly modify electron spectra and radio emission.

Findings

Fast-mode waves can reaccelerate electrons efficiently.

Reacceleration can produce soft radio spectra with index ≤ -0.6.

Spectral modifications are weakly dependent on initial spectra.

Abstract

The radio spectra of many shell-type supernova remnants show deviations from those expected on theoretical grounds. In this paper we determine the effect of stochastic reacceleration on the spectra of electrons in the GeV band and at lower energies, and we investigate whether or not reacceleration can explain the observed variation of radio spectral indices. We explicitely calculate the momentum diffusion coefficient for 3 types of turbulence expected downstream of the forward shock: fast-mode waves, small-scale non-resonant modes, and large-scale modes arising from turbulent dynamo activity. Noting that low-energy particles are efficiently coupled to the quasi-thermal plasma, a simplified cosmic-ray transport equation can be formulated and is numerically solved. Only fast-mode waves can provide momentum diffusion fast enough to significantly modify the spectra of particles. Using a synchrotron emissivity that accurately reflects a highly turbulent magnetic field, we calculate the radio spectral index and find that soft spectra with index $\alpha\lesssim -0.6$ can be maintained over more than 2 decades in radio frequency, even if the electrons experience reacceleration for only one acceleration time. A spectral hardening is possible but considerably more frequency-dependent. The spectral modification imposed by stochastic reacceleration downstream of the forward shock depends only weakly on the initial spectrum provided by, e.g., diffusive shock acceleration at the shock itself.