Radio emission and particle acceleration in plerionic supernova remnants

Institute for Astronomy and Astrophysics, University of Munich, Germany e-mail: nodes@usm.uni-muenchen.de

Received: 13 January 2004
Accepted: 7 May 2004

Abstract

Plerionic supernova remnants exhibit radio emission with remarkably flat spectral indices ranging from to . The origin of very hard particle energy distributions still awaits an explanation, since shock waves generate particle distributions with synchrotron spectra characterized by . Acceleration of high energy leptons in magnetohydrodynamic turbulence instead may be responsible for the observed hard spectra. This process is studied by means of relativistic test particle calculations using electromagnetic fields produced by three-dimensional simulations of resistive magnetohydrodynamical turbulence. The particles receive power-law energy spectra with s ranging from 1.2 to 1.6, i.e. particle spectra that are required to explain the radio emission of plerions.