Nishikawa 2009 3D模拟非磁化的相对论性激波

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Title:		Weibel instability and associated strong fields in a fully 3D simulation of a relativistic shock
Authors:		Nishikawa, K. -I.; Niemiec, J.; Hardee, P. E.; Medvedev, M.; Sol, H.; Mizuno, Y.; Zhang, B.; Pohl, M.; Oka, M.; Hartmann, D. H.
Publication:		eprint arXiv:0904.0096
Publication Date:		04/2009
Origin:		ARXIV
Keywords:		Astrophysics - Earth and Planetary Astrophysics
Comment:		4 pages, 3 figures, submitted to ApJL
Bibliographic Code:		2009arXiv0904.0096N

Abstract

Plasma instabilities (e.g., Buneman, Weibel and other two-stream instabilities) ex- cited in collisionless shocks are responsible for particle (electron, positron, and ion) acceleration. Using a new 3-D relativistic particle-in-cell code, we have investigated the particle acceleration and shock structure associated with an unmagnetized relativis- tic electron-positron jet propagating into an unmagnetized electron-positron plasma. The simulation has been performed using a long simulation system in order to study the nonlinear stages of the Weibel instability, the particle acceleration mechanism, and the shock structure. Cold jet electrons are thermalized and slowed while the ambient electrons are swept up to create a partially developed hydrodynamic (HD) like shock structure. In the leading shock, electron density increases by a factor of 3.5 in the simulation frame. Strong electromagnetic fields are generated in the trailing shock and provide an emission site. We discuss the possible implication of our simulation results within the AGN and GRB context.

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