Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-11
Phys.Rev.Lett.96:115006,2006
Astronomy and Astrophysics
Astrophysics
Revised for Phys. Rev. Lett. Please see publised version for best graphics
Scientific paper
10.1103/PhysRevLett.96.115006
We report on the observation of rapid particle acceleration in numerical simulations of relativistic jet-plasma interactions and discuss the underlying mechanisms. The dynamics of a charge-neutral, narrow, electron-positron jet propagating through an unmagnetized electron-ion plasma was investigated using a three-dimensional, electromagnetic, particle-in-cell computer code. The interaction excited magnetic filamentation as well as electrostatic plasma instabilities. In some cases, the longitudinal electric fields generated inductively and electrostatically reached the cold plasma wave-breaking limit, and the longitudinal momentum of about half the positrons increased by 50% with a maximum gain exceeding a factor of 2 during the simulation period. Particle acceleration via these mechanisms occurred when the criteria for Weibel instability were satisfied.
Ng Johnny S. T.
Noble Robert J.
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