Journal Article

Dynamics of strongly magnetized ejecta in gamma-ray bursts

Maxim Lyutikov

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 1, pages 422-426
Published in print February 2011 | ISSN: 0035-8711
Published online January 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17696.x
Dynamics of strongly magnetized ejecta in gamma-ray bursts

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We consider dynamical scales in magnetized gamma-ray burst (GRB) outflows, using the solutions to the Riemann problem of expanding arbitrarily magnetized outflows. For high ejecta magnetization, the behaviour of the forward shock closely resembles the so-called thick-shell regime of the hydrodynamical expansion. The exception is at small radii, where the motion of the forward shock is determined by the dynamics of subsonic relativistic outflows. The behaviours of the reverse shock is different in fluid and magnetized cases: in the latter case, even for medium magnetization, σ∼ 1, the reverse shock forms at fairly large distances, and may never form in a wind-type external density profile.

Keywords: gamma-ray burst: general

Journal Article.  3638 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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