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arXiv 2210.12904astro-ph.HE
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GRB 190829 A的早期余辉偏振研究

Exploring the Early Afterglow Polarization of GRB 190829A

A. C. Caligula do E. S. Pedreira, N. Fraija, S. Dichiara, P. Veres, M. G. Dainotti, A. Galvan-Gamez, R. L. Becerra, B. Betancourt Kamenetskaia

摘要:

GRB 190829 A由于其性质和高能量发射而被广泛研究。由于高能立体观测系统探测到了一个非常高能量的成分,并且该事件的光度在理论上是中等的,因此它被归类为一组有限的爆发,与经典的伽马射线暴和附近的亚能量事件接壤。考虑到用于充分描述这一爆发余辉的模型范围,确定最可能的解释已被证明具有挑战性。然而,MASTER合作提供的偏振数据的检测为GRB 190829 A增加了一个新的方面,使我们能够尝试探索这种简并性。在本文中,我们提出了一个偏振模型耦合同步加速器前向冲击波模型-一个组件在所有的模型用于描述GRB 190829 A的余辉-为了适应偏振的时间演化与现有的上限($Π< 6\%$)。我们发现,从轴上发射产生的极化有利于强各向异性磁场比,而离轴的情况下,不能完全排除当考虑到一个更各向同性的框架。

英文摘要:

The GRB 190829A has been widely studied due to its nature and the high energy emission presented. Due to the detection of a very-high-energy component by the High Energy Stereoscopic System and the event's atypically middling luminosity, it has been categorized in a select, limited group of bursts bordering classic GRBs and nearby sub-energetic events. Given the range of models utilized to adequately characterize the afterglow of this burst, it has proven challenging to identify the most probable explanation. Nevertheless, the detection of polarization data provided by the MASTER collaboration has added a new aspect to GRB 190829A that permits us to attempt to explore this degeneracy. In this paper, we present a polarization model coupled with a synchrotron forward-shock model -- a component in all models used to describe GRB 190829A's afterglow -- in order to fit the polarization's temporal evolution with the existing upper limits ($Π< 6\%$). We find that the polarization generated from an on-axis emission is favored for strongly anisotropic magnetic field ratios, while an off-axis scenario cannot be fully ruled out when a more isotropic framework is taken into account.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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