Collisionless Weibel Shocks and Electron Acceleration in Gamma-Ray Bursts - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astrophysical Journal Year : 2015

Collisionless Weibel Shocks and Electron Acceleration in Gamma-Ray Bursts


A study of collisionless external shocks in gamma-ray bursts is presented. The shock structure, electromagnetic field, and process of electron acceleration are assessed by performing a self-consistent 3D particle-in-cell simulation. In accordance with hydrodynamic shock systems, the shock consists of a reverse shock (RS) and forward shock separated by a contact discontinuity. The development and structure are controlled by the ion Weibel instability. The ion filaments are sources of strong transverse electromagnetic fields at both sides of the double shock structure over a length of 30–100 ion skin depths. Electrons are heated up to a maximum energy. Jet electrons are trapped in the RS transition region due to the presence of an ambipolar electric field and reflection by the strong transverse magnetic fields in the shocked region. In a process similar to shock surfing acceleration for ions, electrons experience drift motion and acceleration by ion filament transverse electric fields in the plane perpendicular to the shock propagation direction. Ultimately, accelerated jet electrons are convected back into the upstream.
Fichier principal
Vignette du fichier
1507.05374.pdf (539.45 Ko) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

insu-01212578 , version 1 (27-11-2020)



Kazem Ardaneh, Dongsheng Cai, Ken-Ichi Nishikawa, Bertrand Lembège. Collisionless Weibel Shocks and Electron Acceleration in Gamma-Ray Bursts. The Astrophysical Journal, 2015, 811 (1), pp.57. ⟨10.1088/0004-637X/811/1/57⟩. ⟨insu-01212578⟩
103 View
35 Download



Gmail Facebook X LinkedIn More