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题名: Constraining external reverse shock physics of gamma-ray bursts from ROTSE-III limits
作者: Cui, Xiao-Hong; Zou, Yuan-Chuan; Wei, Jun-Jie; Zheng, Wei-Kang; Wu, Xue-Feng
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2018
卷号: 473, 期号:4, 页码:5142-5153
英文摘要: Assuming that early optical emission is dominated by external reverse shock (RS) in the standard model of gamma-ray bursts (GRBs), we intend to constrain RS models with an initial Lorentz factor Gamma(0) of the outflows based on the ROTSE-III observations. We consider two cases of RS behaviour: relativistic shock and non-relativistic shock. For a homogeneous interstellar medium (ISM) and the wind circum-burst environment, constraints can be achieved by the fact that the peak flux F-nu at the RS crossing time should be lower than the observed upper limit F-nu,F- limit. We consider the different spectral regimes in which the observed optical frequency nu(opt) may locate, which are divided by the orders for the minimum synchrotron frequency nu(m) and the cooling frequency nu(c). Considering the homogeneous and wind environments around GRBs, we find that the relativistic RS case can be constrained by the (upper and lower) limits of Gamma(0) in a large range from about hundreds to thousands for 36 GRBs reported by ROTSE-III. Constraints on the non-relativistic RS case are achieved with limits of Gamma(0) ranging from similar to 30 to similar to 350 for 26 bursts. The lower limits of Gamma(0) achieved for the relativistic RS model are disfavored based on the previously discovered correlation between the initial Lorentz factor Gamma(0) and the isotropic gamma-ray energy E-gamma,E- iso released in the prompt phase.
语种: 英语
WOS记录号: WOS:000424117300062
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/18020
Appears in Collections:南极天文中心_期刊论文

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