Ultrarelativistic Plasma Shell Collisions in γ-Ray Burst Sources: Dimensional Effects on the Final Steady State Magnetic Field

Details Ultrarelativistic Plasma Shell Collisions in γ-Ray Burst Sources: Dimensional Effects on the Final Steady State Magnetic Field Ultrarelativistic Plasma Shell Collisions in γ-Ray Burst Sources: Dimensional Effects on the Final Steady State Magnetic Field

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...618..822j&link_type=abstract

The Astrophysical Journal, Volume 618, Issue 2, pp. 822-831.

Astronomy and Astrophysics

Astronomy

40

Acceleration Of Particles, Gamma Rays: Bursts, Magnetic Fields, Plasmas

Scientific paper

Ultrarelativistic electron-positron plasma shell collisions as an integral part of generic γ-ray burst (GRB) fireball models are studied in the framework of self-consistent three-dimensional particle-in-cell simulations. We compare scenarios at moderately relativistic (γ0~=10) and ultrarelativistic (γ0~=100) energies that directly correspond to the regimes of internal and external shell collisions, respectively, in GRB synchrotron emission models. Simulated systems comprise 5×108 particles, applying a relativistic, fully electromagnetic, massively parallelized code. It is found that Weibel-generated, steady state magnetic equipartition ratios in external collisions reach up to ɛB~12%, exceeding the respective internal ratios by nearly a power of 10. Enhanced ɛB yields can be explained theoretically by the effective reduction of dimensionality in the ultrarelativistic limit, i.e., the energy-dependent confinement of the three-dimensional Weibel instability within quasi-two-dimensional plasma shell slices.

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