Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-03-23
Astronomy and Astrophysics
Astrophysics
6 pages, 3 figures, submitted to Proceeding of the 22nd Texas Symposium on Relativistic Astrophysics and Cosmology, Dcember 13
Scientific paper
Shock acceleration is a ubiquitous phenomenon in astrophysical plasmas. Plasma waves and their associated instabilities (e.g., Buneman, Weibel and other two-stream instabilities) created in collisionless shocks are responsible for particle (electron, positron, and ion) acceleration. Using a 3-D relativistic electromagnetic particle (REMP) code, we have investigated particle acceleration associated with a relativistic jet front propagating into an ambient plasma. We find that the growth times of the Weibel instability in electron-positron jets are not affected by the (electron-positron or electron-ion) ambient plasmas. However, the amplitudes of generated local magnetic fields in the electron-ion ambient plasma are significantly larger than those in the electron-positron ambient plasma.
Fishman Gerald J.
Hardee Philip
Hededal Christian Busk
Nishikawa Ken-Ichi
Preece Rob
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