Baryon loading and the Weibel instability in gamma-ray bursts

Details Baryon loading and the Weibel instability in gamma-ray bursts Baryon loading and the Weibel instability in gamma-ray bursts

2006-08-24

arxiv.org/abs/astro-ph/0608519v1

Mon.Not.Roy.Astron.Soc.372:1851-1855,2006

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures. Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2006.10980.x

The dynamics of two counter-streaming electron-positron-ion unmagnetized plasma shells with zero net charge is analyzed in the context of magnetic field generation in GRB internal shocks due to the Weibel instability. The effects of large thermal motion of plasma particles, arbitrary mixture of plasma species and space charge effects are taken into account. We show that, although thermal effects slow down the instability, baryon loading leads to a non-negligible growth rate even for large temperatures and different shell velocities, thus guaranteeing the robustness and the occurrence of the Weibel instability for a wide range of scenarios.

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