Particle Acceleration at Shocks: Insights from Supernova Remnant Shocks |
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Authors: | T W Jones |
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Institution: | 1.Department of Astronomy and the Minnesota Supercomputing Institute,University of Minnesota,Minneapolis,USA |
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Abstract: | I review some basic properties of diffusive shock acceleration (DSA) in the context of young supernova remnants (SNRs). I
also point out some key differences with cosmological, cluster-related shocks. DSA seems to be very efficient in strong, young
SNR shocks. Provided the magnetic fields exceed some hundreds of μGauss (possibly amplified by CR related dynamics), these shocks can accelerate cosmic ray hadrons to PeV energies in the time
available to them. Electron energies, limited by radiative losses, are likely limited to the TeV range. Injection of fresh
particles at these shocks is poorly understood, but hadrons are much more easily injected than the more highly magnetized
electrons. That seems supported by observational data, as well. So, while CR protons in young SNRs may play very major roles
in the SNR evolution, the CR electron populations have minimal such impact, despite their observational importance. |
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