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Two-stage acceleration of interstellar ions due to the interaction of high-energy lepton plasma flow

Research paper by Yun-Qian Cui, Zheng-Ming Sheng, Quan-Ming Lu, Yu-Tong Li, Jie Zhang

Indexed on: 16 Dec '15Published on: 16 Dec '15Published in: arXiv - Astrophysics - High Energy Astrophysical Phenomena



Abstract

We present the particle-in-cell (PIC) simulation results of the interaction of a high-energy lepton plasma flow with background electron-proton plasma and focus on the acceleration processes of the protons. It is found that the acceleration follows a two-stage processes. In the first stage, protons are accelerated transversely (perpendicular to the lepton flow) by the turbulent magnetic field "islands" generated via the strong Weibel-type instabilities. The accelerated protons shows a perfect inverse-power energy spectrum. As the interaction continues, a shockwave structure forms and the protons in front of the shockwave are reflected at twice of the shock speed, resulting in a quasi-monoenergetic peak located near 200MeV under the simulation parameters.