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题名: THE MAGNETIZATION DEGREE OF THE OUTFLOW POWERING THE HIGHLY POLARIZED REVERSE-SHOCK EMISSION OF GRB 120308A
作者: Zhang Sun(张笋) ; Jin ZhiPing(金志平) ; Wei DaMing(韦大明)
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2015
卷号: 798, 期号:1, 页码:3
学科分类: 天文和天体物理
文章类型: 期刊论文
英文摘要: GRB120308A, a long duration gamma-ray burst (GRB) detected by Swift, was distinguished by a highly polarized early optical afterglow emission that strongly suggests an ordered magnetic field component in the emitting region. In this work, we model the optical and X-ray emission in the reverse and forward shock scenario and show that the strength of the magnetic field in the reverse-shock region is similar to 10 times stronger than that in the forward shock region. Consequently, the outflow powering the highly polarized reverse-shock optical emission was mildly magnetized at a degree of sigma similar to a few percent. Considering the plausible magnetic energy dissipation in both the acceleration and prompt emission phases of the GRB outflow, the afterglow data of GRB 120308A provides us with compelling evidence that, at least for some GRBs, a nonignorable fraction of the energy was released in the form of Poynting flux, confirming the finding first made in the reverse-forward shock emission modeling of the optical afterglow of GRB990123 by Fan et al. in 2002 and Zhang et al. in 2003.
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000347245100003
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14856
Appears in Collections:宇宙伽马暴、中子星及相关物理研究团组_期刊论文

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