Particle Acceleration in Relativistic Shocks

Details Particle Acceleration in Relativistic Shocks Particle Acceleration in Relativistic Shocks

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dppbp1051t&link_type=abstract

American Physical Society, 42nd Annual Meeting of the APS Division of Plasma Physics combined with the 10th International Congre

Physics

Plasma Physics

Scientific paper

There is clear evidence from observations of x-ray and gamma ray radiation that electrons are accelerated to high velocities near energetic astrophysical objects such as pulsars, supernova remnants, and gamma-ray bursters. It is usually assumed that some or all of this acceleration takes place inside of relativistic shocks. We used 3D electromagnetic particle in cell codes to simulate generic relativistic shock formation conditions. We have simulated both electron-positron and electron-ion shock formation. In both cases two neutral plasma clouds collide at mildly relativistic velocities. This scenario is Weibel unstable. As the instability saturates, strong shear Alfven waves bounce around on a 'magnetic lattice' formed by the Weibel instability. These Alfven waves have large transverse electric fields associated with them E_t= fracVac δ B. We observe the part of the electron distribution resonant with these waves generate a high energy tail in the electron distribution. Work supported by NSF and DOE

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