Late Afterglow Bump/Plateau around the Jet Break: Signature of a Free-to-shocked Wind Environment in Gamma-Ray Burst
Late Afterglow Bump/Plateau around the Jet Break: Signature of a Free-to-shocked Wind Environment in Gamma-Ray Burst
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急流周围的晚余辉隆起/平台：伽马射线暴中自由冲击风环境的特征
DOI：
10.3847/1538-4357/ac1ff2
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发表时间：
2021-04
影响因子：
4.9
通讯作者：
En-Wei Liang
中科院分区：
文献类型：
--
作者：
Xiao-Yan Li;Da-Bin Lin;Jia Ren;Shu-Jin Hou;Yu-Fei Li;Xiang-Gao Wang;En-Wei Liang
许多伽玛射线暴（GRB）在喷流破裂周围的光学余辉和X射线余辉中同时表现出隆起。这些隆起与GRB 170817 A的余辉相似，只是之前有一个长而浅的衰变。其起源尚不清楚。我们认为，这些后期同时发生的碰撞可能是环暴环境从自由风介质向等密度介质的过渡，震动风介质。在本文中，我们研究了一个外部向前冲击波传播的自由激波风环境中的发射在不同的视角。高视角观测者在光学和X射线余辉中发现了后期同时的隆起/平台，随后是陡峭的衰减。此外，这些理论上的碰撞之前有一个长的平台或浅衰减，这是在自由风环境中传播的外部向前激波期间形成的。对于低视角观察者，上述凸起也会出现，但仅在结构射流具有低特征角且核心射流的减速半径在自由风边界附近或超出自由风边界的情况下。我们搜索伽玛暴余辉与后期同时光学和X射线的颠簸，然后是一个陡峭的衰减。获得了120326 A、100901 A、100814 A和120404 A γ射线暴。我们发现，在自由激波风环境中观察到的外前向激波可以很好地解释GRB 120326 A，100901 A和100814 A（GRB 120404 A）中的光学和X射线余辉。
A number of gamma-ray bursts (GRBs) exhibit the simultaneous bumps in their optical and X-ray afterglows around the jet break. These bumps are similar to the afterglows of GRB 170817A, except preceded by a long shallow decay. Its origin is unclear. We suggest that these late simultaneous bumps may sound a transition of circumburst environment from a free-wind medium to a constant density medium, e.g., the shocked-wind medium. In this paper, we study the emission of an external-forward shock propagating in a free-to-shocked wind environment at different viewing angles. The late simultaneous bumps/plateaux followed by a steep decay are found in the optical and X-ray afterglows for high-viewing-angle observers. In addition, these theoretical bumps are preceded by a long plateau or shallow decay, which is formed during the external-forward shock propagating in the free-wind environment. For low-viewing-angle observers, the above bumps also appear but only in the situation where the structured jet has a low characteristic angle and the deceleration radius of the in-core jet flow is at around or beyond the free-wind boundary. We search GRBs for afterglows with the late simultaneous optical and X-ray bumps followed by a steep decay. GRBs 120326A, 100901A, 100814A, and 120404A are obtained. We find that an off-core (in-core) observed external-forward shock in a free-to-shocked wind environment can well explain the optical and X-ray afterglows in GRBs 120326A, 100901A, and 100814A (GRB 120404A).
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DOI：
10.1201/9780585368115
发表时间：
1997
期刊：
--
影响因子：
--
作者：
J. Dyson;D. Williams
通讯作者：
J. Dyson;D. Williams
冷却电子产生的伽马射线爆发的低能光谱
DOI：
10.3847/1538-4365/aa9e84
发表时间：
2017-09
期刊：
Astrophysical Journal, The - Supplement Series
影响因子：
--
作者：
Geng Jin-Jun;Huang Yong-Feng;Wu Xue-Feng;Zhang Bing;Zong Hong-Shi
通讯作者：
Zong Hong-Shi
影响因子：
4.8
作者：
G. Lamb;D. A. Kann;J. Fern'andez;I. Mandel;A. Levan;N. Tanvir
通讯作者：
G. Lamb;D. A. Kann;J. Fern'andez;I. Mandel;A. Levan;N. Tanvir
利用重子加载约束GRB 170817A喷流发射时间
影响因子：
7.9
作者：
Ren Jia;Lin Da-Bin;Zhang Lu-Lu;Wang Kai;Li Xiao-Yan;Wang Xiang-Gao;Liang En-Wei
通讯作者：
Liang En-Wei
多脉冲伽马射线暴中的自组织临界性
影响因子：
7.5
作者：
Lyu Fen;Li Ya-Ping;Hou Shu-Jin;Wei Jun-Jie;Geng Jin-Jun;Wu Xue-Feng
通讯作者：
Wu Xue-Feng