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To Power the X-Ray Plateaus of Gamma-Ray Bursts through Larger Amplitude Electromagnetic Waves
The Astrophysical Journal ( IF 4.9 ) Pub Date : 2020-09-23 , DOI: 10.3847/1538-4357/abaf4d
Shuang Du 1, 2
Affiliation  

The origin of gamma-ray burst (GRB) X-ray plateau, especially the internal plateau is still unclear, but could be related to GRB's central engine of magnetar. It is generally believed that the spin-down power of the magnetar is injected into forward external shock, however we propose here that most of the power will be dissipated behind the GRB jet through larger amplitude electromagnetic wave (LAEMW). The relevant physical conditions and observational implications are analyzed and discussed, and various kinds of X-ray light curves could be reproduced. Although it is still a matter of debate about the chromatic multi-band afterglow in the standard external afterglow fireball model, we can explain naturally this feature under this scenario. Furthermore, we predict that the X-ray emission of spin-down wind could possibly precede the prompt emission of GRB jet if the energy of LAEMW is dissipated first but shock-induced radiation in the jet is produced later. It is emphasized that both the GRB jet and the spin-down wind should have significant observational consequences in the magnetar scenario, and would be focused equally in GRB physics.

中文翻译:

通过更大振幅的电磁波为伽马射线暴的 X 射线平台供电

伽马射线暴(GRB)X射线高原的起源,特别是内部高原尚不清楚,但可能与GRB的磁星中心引擎有关。一般认为,磁星的自旋下降功率被注入到前向外部激波中,但我们在这里提出,大部分功率将通过更大幅度的电磁波(LAEMW)在 GRB 喷流后面消散。对相关物理条件和观测意义进行了分析和讨论,可以再现各种X射线光变曲线。虽然关于标准外余辉火球模型中的彩色多波段余辉仍然存在争议,但我们可以自然地解释这种情况下的这一特征。此外,我们预测,如果LAEMW的能量先耗散,然后在射流中产生激波辐射,则自旋风的X射线发射可能先于GRB射流的快速发射。需要强调的是,GRB 喷流和自旋下风在磁星场景中都应该具有显着的观测结果,并且在 GRB 物理学中将同样受到关注。
更新日期:2020-09-23
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