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gamma-ray burst internal shocks with magnetization
Fan, YZ; Wei, DM; Zhang, B
2004-11-11
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号354期号:4页码:1031-1039
摘要We investigate gamma-ray burst (GRB) internal shocks with moderate magnetization, with the magnetization parameter sigma ranging from 0.001 to 10. Possible magnetic dissipation in the stripped magnetized shells is also taken into account through introducing a parameter k (0 < k <= 1), which is the ratio of the electric field strength of the downstream and the upstream. By solving the general MHD jump conditions, we show that the dynamic evolution of the shock with magnetic dissipation is different from the familiar one obtained in the ideal MHD limit. As long as the relative velocity between the two magnetized shells is larger than the corresponding Alfven velocities in both shells, strong internal shocks still exist for sigma >> 1, which can effectively tap kinetic energy into radiation. However, in the ideal MHD limit (k = 1), the upstream magnetic energy cannot be converted into the downstream thermal energy so that the GRB radiation efficiency is low. This is probably inconsistent with the current GRB data. With magnetic dissipation, e.g. k <= 0.5, the range of k is constrained given a particular upstream-downstream Lorentz factor gamma(21) and a magnetization parameter sigma, a significant fraction of the upstream magnetic energy can be converted into the prompt gamma-ray emission. At the typical internal shock radius, the characteristic synchrotron emission frequency in the magnetic dissipation-dominated case is however too large (proportional to sigma(2)) compared with the data if sigma >> 1. On the other hand, as long as the ordered magnetic field is stronger than or at least comparable with the random one generated in the internal shocks, a net linear polarization >= 30 per cent results. In view of the possible high degree of linear polarization of GRB 021206 and the identification of a possible highly magnetized flow in GRB 990123 and GRB 021211, we suggest that a mildly magnetized internal shock model (0.01 < sigma < 1) with moderate magnetic dissipation is a good candidate to explain the GRB prompt emission data.
关键词Magnetic Fields Mhd Relativity Shock Waves Gamma-rays : Bursts
DOI10.1111/j.1365-2966.2004.08263.x
收录类别SCI
语种英语
WOS记录号WOS:000224922600012
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被引频次:37[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8393
专题光学天文研究部
作者单位1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16082 USA
4.Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA
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Fan, YZ,Wei, DM,Zhang, B. gamma-ray burst internal shocks with magnetization[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2004,354(4):1031-1039.
APA Fan, YZ,Wei, DM,&Zhang, B.(2004).gamma-ray burst internal shocks with magnetization.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,354(4),1031-1039.
MLA Fan, YZ,et al."gamma-ray burst internal shocks with magnetization".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 354.4(2004):1031-1039.
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