Radio emission and particle acceleration in plerionic supernova remnants

Abstract

Plerionic supernova remnants exhibit radio emission with remarkably flat spectral indices ranging from $\alpha =0.0$ to $\alpha =-0.3$. The origin of very hard particle energy distributions still awaits an explanation, since shock waves generate particle distributions with synchrotron spectra characterized by $\alpha \le -0.5$. 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 $N(\gamma )\propto {\gamma }^{-s}$ with $s$ ranging from 1.2 to 1.6, i.e. particle spectra that are required to explain the radio emission of plerions.

8 pages, 7 Figures, to be published in A&A

References in corpus (4)

• The Crab Nebula at 1.3 mm: evidence for a new synchrotron component
• Particle Acceleration in three dimensional Reconnection Regions: A New Test Particle Approach
• Particle acceleration in three-dimensional tearing configurations
• Synchrotron Model for the Infrared, Optical and X-Ray Emission of the Crab Pulsar

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• Radio, X-ray, and gamma-ray Emission Models of the Colliding Winds Binary WR 140
• Spitzer Space Telescope Infrared Imaging and Spectroscopy of the Crab Nebula
• The curvature of spectral energy distribution of blazars