期刊
ASTROPHYSICAL JOURNAL
卷 885, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab43cf
关键词
Shocks; Space plasmas; Supernova remnants; Interstellar medium
资金
- Narodowe Centrum Nauki [DEC-2013/10/E/ST9/00662]
- JSPS-PAN Bilateral Joint Research Project [180500000671]
- North-German Supercomputing Alliance (HLRN) [bbp00003, bbp00014]
We explore electron preacceleration at high-Mach-number nonrelativistic perpendicular shocks at, e.g., young supernova remnants, which are a prerequisite of further acceleration to very high energies via diffusive shock acceleration. Using fully kinetic particle-in-cell simulations of shocks and electron dynamics in them, we investigate the influence of shock-surfing acceleration (SSA) at the shock foot on the nonthermal population of electrons downstream of the shock. The SSA is followed by further energization at the shock ramp where the Weibel instability spawns a type of second-order Fermi acceleration. The combination of these two processes leads to the formation of a nonthermal electron population, but the importance of SSA becomes smaller for larger ion-to-electron mass ratios in the simulation. We discuss the resulting electron spectra and the relevance of our results to the physics of systems with real ion-to-electron mass ratios and fully three-dimensional behavior.
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