Afterglow light curves from magnetized GRB flows

被引：0

作者：

Mimica, Petar ^{[1
]}

Giannios, Dimitrios

Aloy, Miguel Angel ^{[1
]}

机构：

[1] Univ Valencia, Dept Astron & Astrofis, E-46100 Burjassot, Spain

来源：

JETS AT ALL SCALES | 2011年 / 275期

关键词：

hydrodynamics (magnetohydrodynamics:) MHD; radiation mechanisms: nonthermal; radiative transfer; shock waves; methods: numerical; gamma rays: bursts; GAMMA-RAY BURST; JETS; DISSIPATION; EMISSION; ENERGY; FIELDS;

D O I：

10.1017/S1743921310016406

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 sigma(0) = 0 to sigma(0) = 1. For typical parameters of the ejecta, the emission from the reverse shock peaks for magnetization sigma(0) similar to 0.01 - 0.1, and is suppressed for higher sigma(0). We fit the early afterglow light curves of ORB 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.

引用

页码：358 / 362

页数：5

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