Two-component jet model for multiwavelength afterglow emission of the extremely energetic burst GRB 221009A
Two-component jet model for multiwavelength afterglow emission of the extremely energetic burst GRB 221009A
复制标题
高能爆发 GRB 221009A 多波长余辉发射的双组分射流模型
DOI：
10.1093/mnrasl/slad038
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发表时间：
2023
影响因子：
--
通讯作者：
Yamazaki, Ryo
中科院分区：
文献类型：
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作者：
Sato, Yuri;Murase, Kohta;Ohira, Yutaka;Yamazaki, Ryo
最近伽玛射线暴（GRBs）已被发现在甚高能量（VHE）的伽玛射线成像大气切伦科夫望远镜，和一个双组分喷流模型经常被调用来解释多波长数据。在这项工作中，多波长余辉辐射从一个非常明亮的伽玛暴，GRB 221009A，检查。这一事件的各向同性等效伽马射线能量是最大的，这表明类似于以前的VHE伽玛暴，喷流开口角是如此之小，准直校正的伽马射线能量是标称的。从这样一个狭窄的射流余辉发射衰减太快，特别是如果射流传播到均匀的环爆物质。在两个组件的射流模型，另一个宽射流组件具有较小的洛伦兹因子占主导地位的后期余辉发射，我们表明，GRB 221009A的多波长数据可以解释为窄，宽射流与其他VHE GRB的开口角相似。我们还讨论了如何模型退化可以与观察解开。
Recently gamma-ray bursts (GRBs) have been detected at very-high-energy (VHE) gamma-rays by imaging atmospheric Cherenkov telescopes, and a two-component jet model has often been invoked to explain multiwavelength data. In this work, multiwavelength afterglow emission from an extremely bright GRB, GRB 221009A, is examined. The isotropic-equivalent gamma-ray energy of this event is among the largest, which suggests that similarly to previous VHE GRBs, the jet opening angle is so small that the collimation-corrected gamma-ray energy is nominal. Afterglow emission from such a narrow jet decays too rapidly, especially if the jet propagates into uniform circumburst material. In the two-component jet model, another wide jet component with a smaller Lorentz factor dominates late-time afterglow emission, and we show that multiwavelength data of GRB 221009A can be explained by narrow and wide jets with opening angles similar to those employed for other VHE GRBs. We also discuss how model degeneracies can be disentangled with observations.