典型文献
On the Jet Structures of GRB 050820A and GRB 070125
文献摘要：
We present the broadband numerical modeling of afterglows for two remarkably bright long gamma-ray bursts (GRBs), GRB 050820A and GRB 070125, with a wide range of observations from the radio band to the X-ray band. In our work, we fit light curves and constrain physical parameters using a standard forward shock model from the afterglowpy Python package, considering different jet structures and the jet lateral expansion. For GRB 050820A, the constrained jet is close to a top-hat jet with an extremely small half opening angle of about 0.015 rad, and the circumburst matter density is as small as 10?7 cm?3, which suggests that this peculiar long GRB might originate from metal-poor stars with low mass-loss rates. To explain the late time optical light curves of GRB 070125, the effects of the lateral expansion and the participation factor of electrons that are accelerated by the shock have to be taken into account. The constrained results for GRB 070125 show that the jet is also close to a top-hat jet with a half opening angle of about 0.1 rad, the viewing angle is about 0.05 rad, the circumburst density is about 10 cm?3, and the participation factor is about 0.1. The jet energy of the two bursts is required to be～1051–1052 erg, which can be produced by a millisecond magnetar or a hyper-accreting black hole.
文献关键词：
中图分类号：
作者姓名：
Xin-Yu Li;Hao-Ning He;Da-Ming Wei
作者机构：
Key Laboratory of Dark Matter and Space Astronomy,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210033,China;School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China
文献出处：
引用格式：
[1]Xin-Yu Li;Hao-Ning He;Da-Ming Wei-.On the Jet Structures of GRB 050820A and GRB 070125)[J].天文和天体物理学研究,2022(08):249-257
A类：
050820A,afterglows,afterglowpy,circumburst,magnetar,accreting
B类：
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AB值：
0.443367
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