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Afterglow light curves from magnetized GRB flows

Published online by Cambridge University Press:  24 February 2011

Petar Mimica ,
Dimitrios Giannios  and
Miguel Ángel Aloy
Petar Mimica
Affiliation:
Departamento de Astronomía y Astrofísica, Universidad de Valencia, 46100, Burjassot, Spain email: Petar.Mimica@uv.es
Dimitrios Giannios
Affiliation:
Department of Astrophysical Sciences, Peyton Hall, Princeton University, Princeton, USA
Miguel Ángel Aloy
Affiliation:
Departamento de Astronomía y Astrofísica, Universidad de Valencia, 46100, Burjassot, Spain email: Petar.Mimica@uv.es
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Abstract

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Using the RMHD code MRGENESIS and the radiative transfer code SPEV we compute multiwavelength afterglow light curves of magnetized ejecta of gamma-ray bursts interacting with a uniform circumburst medium. We are interested in the emission from the reverse shock when ejecta magnetization varies from σ0 = 0 to σ0 = 1. For typical parameters of the ejecta, the emission from the reverse shock peaks for magnetization σ0 ~ 0.01 − 0.1, and is suppressed for higher σ0. We fit the early afterglow light curves of GRB 990123 and 090102 and discuss the possible magnetization of the outflows of these bursts. Finally we discuss the amount energy left in the magnetic field which is available for dissipation at later afterglow stages.

Keywords

hydrodynamics (magnetohydrodynamics:) MHDradiation mechanisms: nonthermalradiative transfershock wavesmethods: numericalgamma rays: bursts
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S275: Jets at all Scales , September 2010 , pp. 358 - 362
Copyright
Copyright © International Astronomical Union 2011

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