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arXiv 1601.01264astro-ph.HE
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GRB130427A早期多波长发射的模拟

Modeling the early multiwavelength emission in GRB130427A

Nissim Fraija, William H. Lee, Péter Veres

摘要:

GRB 130427 A是最强大的伽马射线暴之一,从GeV的$γ$射线到光学波长都被迅速探测到。在GeV波段,费米伽马射线太空望远镜上的大面积望远镜(LAT)观测到了有史以来记录的最高能量的光子95 GeV,以及早期阶段的明亮峰值,随后的发射时间延长了20多个小时。在光学波段,RAPTOR在R波段报告了触发后9.31 s至19.31 s时间间隔内的亮度为$7.03\pm 0.03$的明亮闪光。利用X射线和光学波段的多波长观测,我们研究了GeV $γ$射线发射的起源。时间上扩展的LAT,X射线和光通量的起源自然被解释为同步辐射和95-GeV的光子和积分通量上限放置的HAWC天文台是一致的同步自康普顿从绝热向前冲击传播到恒星风的祖先。极端LAT峰和明亮的光学闪光解释通过同步自康普顿和同步辐射从反向冲击,分别当喷出物在厚壳制度的演变,并进行了显着的磁场。

英文摘要:

One of the most powerful gamma-ray bursts, GRB 130427A was swiftly detected from GeV $γ$-rays to optical wavelengths. In the GeV band, the Large Area Telescope (LAT) on board the Fermi Gamma-Ray Space Telescope observed the highest-energy photon ever recorded of 95 GeV, and a bright peak in the early phase followed by emission temporally extended for more than 20 hours. In the optical band, a bright flash with a magnitude of $7.03\pm 0.03$ in the time interval from 9.31 s to 19.31 s after the trigger was reported by RAPTOR in r-band. We study the origin of the GeV $γ$-ray emission, using the multiwavelength observation detected in X-ray and optical bands. The origin of the temporally extended LAT, X-ray and optical flux is naturally interpreted as synchrotron radiation and the 95-GeV photon and the integral flux upper limits placed by the HAWC observatory are consistent with synchrotron self-Compton from an adiabatic forward shock propagating into the stellar wind of its progenitor. The extreme LAT peak and the bright optical flash are explained through synchrotron self-Compton and synchrotron emission from the reverse shock, respectively, when the ejecta evolves in thick-shell regime and carries a significant magnetic field.

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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