The change of GRB polarization angles in the magnetic-dominated jet model

The change of GRB polarization angles in the magnetic-dominated jet model
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磁控射流模型中GRB极化角的变化

DOI:
10.1093/mnras/stu2051
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发表时间:
2014-05
影响因子:
4.8
通讯作者:
Lin Hai-Nan
Lin Hai-Nan
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Chang Zhe;Lin Hai-Nan

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对伽玛暴100826A瞬发相位的偏振测量表明,两个相邻时间间隔之间的偏振角变化约为∼90°。我们将证明这种现象可以在磁控喷流(MDJ)模型的框架内自然地解释。MDJ模型表明,流出的整体洛伦兹因子随着Γ ∝r1/3的增加而增大,直到达到一个饱和值ΓSat。电子在中央引擎喷流平流的全球有序磁场中运动,产生同步光子。偏振的同步加速器光子沿喷流方向传播,然后与喷流前方的冷电子相撞。经过康普顿散射过程后,这些光子从喷流中逃逸出来,并被稍微偏离轴线的观察者探测到。如果光子在整体洛伦兹因子饱和之前发射,偏振角的变化是流出加速的自然结果。
The polarimetric measurement on the prompt phase of GRB 100826A shows that the polarization angle changes ∼90° between two adjacent time intervals. We will show that this phenomenon can be naturally interpreted in the framework of the magnetic-dominated jet (MDJ) model. The MDJ model suggests that the bulk Lorentz factor of the outflow increases as Γ ∝r1/3, until reaching a saturated value Γsat. Electrons move in the globally ordered magnetic field advected by the jet from the central engine and produce synchrotron photons. The polarized synchrotron photons travel alone the jet direction and then collide with the cold electrons at the front of the jet. After the Compton scattering process, these photons escape from the jet and are detected by the observer locating slightly off-axis. If photons are emitted before the bulk Lorentz factor saturates, the change of polarization angle is a natural result of the acceleration of the outflow.
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期刊: The Astrophysical Journal
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