Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-01-26
AIP Conf.Proc.1133:235-237,2009
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
3 pages, 2 figures, submitted for the Proceedings of The Sixth Huntsville Gamma-Ray Burst Symposium 2008, Huntsville, AL, Octo
Scientific paper
10.1063/1.3155889
Using our new 3-D relativistic electromagnetic particle (REMP) code parallelized with MPI, we have investigated long-term particle acceleration associated with an relativistic electron-positron jet propagating in an unmagnetized ambient electron-positron plasma. The simulations have been performed using a much longer simulation system than our previous simulations in order to investigate the full nonlinear stage of the Weibel instability and its particle acceleration mechanism. Cold jet electrons are thermalized and ambient electrons are accelerated in the resulting shocks. The acceleration of ambient electrons leads to a maximum ambient electron density three times larger than the original value. Behind the bow shock in the jet shock strong electromagnetic fields are generated. These fields may lead to the afterglow emission. We have calculated the time evolution of the spectrum from two electrons propagating in a uniform parallel magnetic field to verify the technique.
Fishman Gerald J.
Frederiksen J.
Hardee Philip
Medvedev Mikhail
Mizuno Yosuke
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