Kinetic Simulations of Nonrelativistic Perpendicular Shocks of Young Supernova Remnants. II. Influence of Shock-surfing Acceleration on Downstream Electron Spectra
- 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.
Author details: | Artem BohdanORCiDGND, Jacek NiemiecORCiDGND, Martin PohlORCiDGND, Yosuke MatsumotoORCiD, Takanobu AmanoORCiD, Masahiro HoshinoORCiDGND |
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DOI: | https://doi.org/10.3847/1538-4357/ab43cf |
ISSN: | 0004-637X |
ISSN: | 1538-4357 |
Title of parent work (English): | The astrophysical journal : an international review of spectroscopy and astronomical physics |
Publisher: | IOP Publ. Ltd. |
Place of publishing: | Bristol |
Publication type: | Article |
Language: | English |
Date of first publication: | 2019/10/24 |
Publication year: | 2019 |
Release date: | 2020/10/20 |
Tag: | Interstellar medium; Shocks; Space plasmas; Supernova remnants |
Volume: | 885 |
Issue: | 1 |
Number of pages: | 9 |
Funding institution: | Narodowe Centrum Nauki [DEC-2013/10/E/ST9/00662]; JSPS-PAN Bilateral Joint Research Project [180500000671]; North-German Supercomputing Alliance (HLRN) [bbp00003, bbp00014] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Peer review: | Referiert |
Publishing method: | Open Access |
Open Access / Green Open-Access |