PMO OpenIR  > 宇宙伽马暴、中子星及相关物理研究团组
THE MAGNETIZATION DEGREE OF THE OUTFLOW POWERING THE HIGHLY POLARIZED REVERSE-SHOCK EMISSION OF GRB 120308A
Zhang, S; Jin, ZP; Wei, DM
2015
Source PublicationASTROPHYSICAL JOURNAL
Volume798Issue:1Pages:3
AbstractGRB120308A, 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.
Subject Area天文和天体物理
Indexed BySCI
Language英语
WOS IDWOS:000347245100003
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/14856
Collection宇宙伽马暴、中子星及相关物理研究团组
Recommended Citation
GB/T 7714
Zhang, S,Jin, ZP,Wei, DM. THE MAGNETIZATION DEGREE OF THE OUTFLOW POWERING THE HIGHLY POLARIZED REVERSE-SHOCK EMISSION OF GRB 120308A[J]. ASTROPHYSICAL JOURNAL,2015,798(1):3.
APA Zhang, S,Jin, ZP,&Wei, DM.(2015).THE MAGNETIZATION DEGREE OF THE OUTFLOW POWERING THE HIGHLY POLARIZED REVERSE-SHOCK EMISSION OF GRB 120308A.ASTROPHYSICAL JOURNAL,798(1),3.
MLA Zhang, S,et al."THE MAGNETIZATION DEGREE OF THE OUTFLOW POWERING THE HIGHLY POLARIZED REVERSE-SHOCK EMISSION OF GRB 120308A".ASTROPHYSICAL JOURNAL 798.1(2015):3.
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