Afterglow light curves from magnetized GRB flows

Details Afterglow light curves from magnetized GRB flows Afterglow light curves from magnetized GRB flows

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..275..358m&link_type=abstract

Jets at all Scales, Proceedings of the International Astronomical Union, IAU Symposium, Volume 275, p. 358-362

Astronomy and Astrophysics

Astronomy

Hydrodynamics (Magnetohydrodynamics:) Mhd, Radiation Mechanisms: Nonthermal, Radiative Transfer, Shock Waves, Methods: Numerical, Gamma Rays: Bursts

Scientific paper

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.

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