Multiple Sub-Jet Model of Gamma-Ray Bursts and Possible Origin of X-Ray Precursors and Postcursors
Multiple Sub-Jet Model of Gamma-Ray Bursts and Possible Origin of X-Ray Precursors and Postcursors
复制标题
伽马射线爆发的多子射流模型和X射线前体和后体的可能起源
DOI：
10.1086/312663
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Takashi Nakamura
中科院分区：
文献类型：
--
作者：
Takashi Nakamura
我们假设伽玛射线暴（GRBs）的内部激波由多个准直半角约为γ数倍的子喷流组成，其中γi是每个子喷流的洛伦兹因子。如果一个次喷流偶然地首先在视线外的轴外发射，那么观测到的峰值能量可能在x射线区域。接下来，如果一个后续的子喷流偶然沿着视线发射，那么峰值能量将在伽马射线区域，伽马射线可能在来自前子喷流的x射线前体之后到达，这取决于参数。这个模型预测了一类新的伽玛暴，它具有极弱和极短的伽玛射线发射，但有x射线前驱和/或后驱以及余辉。
We assume that internal shocks of gamma-ray bursts (GRBs) consist of multiple sub-jets with a collimation half-angle of about several times γ, where γi is the Lorentz factor of each sub-jet. If by chance a sub-jet is first emitted off-axis from the line of sight, the observed peak energy can be in the X-ray region. Next, if by chance a subsequent sub-jet is emitted along the line of sight, then the peak energy will be in the gamma-ray region and the gamma ray may arrive after the X-ray precursor from the former sub-jet depending on parameters. This model predicts a new class of GRBs with extremely weak and short gamma-ray emission but X-ray precursors and/or postcursors as well as an afterglow.
DOI：
10.1086/312235
发表时间：
1999-07
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
Takashi Nakamura
通讯作者：
Takashi Nakamura