Particle Acceleration at Shocks: Insights from Supernova Remnant Shocks

Journal of astrophysics and astronomy

T. W. Jones1¹ 

[1] Department of Astronomy and the Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455, USA.$$

关键词: Particle acceleration;    supernova remnant shocks;    galaxy cluster shocks.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

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.

【 授权许可】

Unknown