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

被引：5

作者：

Chang, Zhe ^{[1
,2
]}

Lin, Hai-Nan ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

[2] Chinese Acad Sci, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2014年 / 445卷 / 04期

关键词：

polarization; radiation mechanisms: non-thermal; scattering; gamma-ray burst: individual: GRB 100826A; GAMMA-RAY BURSTS; FERMI OBSERVATIONS; PROMPT EMISSION; LINEAR-POLARIZATION; OPTICAL AFTERGLOW; BLACK-HOLES; ACCELERATION; RADIATION; COMPONENT; OUTFLOWS;

D O I：

10.1093/mnras/stu2051

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The polarimetric measurement on the prompt phase of GRB 100826A shows that the polarization angle changes similar to 90 degrees 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 Gamma proportional to r(1/3), until reaching a saturated value Gamma(sat). 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.

引用

页码：4105 / 4109

页数：5

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