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arXiv 1802.01683astro-ph.HE
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THESEUS和伽马射线暴:对理解瞬发辐射的有价值的贡献

THESEUS and Gamma-Ray Bursts: a valuable contribution to the understanding of prompt emission

Lara Nava, Gor Oganesyan, Maria E. Ravasio, Lorenzo Amati, Giancarlo Ghirlanda, Paul O'Brien, Julian P. Osborne, Richard Willingale

摘要:

在拟合伽马射线暴(GRB)的瞬发光谱方面的最新进展正在促进我们对这种辐射仍然难以捉摸的起源的理解。这些进展是可能的,这要归功于对瞬发光谱的低能部分($<$\,100\,keV)的更详细的分析,其中有时发现光谱形状偏离简单的幂律形状。这种偏差可以通过光谱中断或通过添加热分量来很好地描述。对于这些研究来说,能量低于1千电子伏的谱数据是非常重要的,但是目前它们只适用于在瞬发辐射期间由X射线望远镜(X射线望远镜,0.3- 10千电子伏)观测到的{ \it Swift}伽马射线暴的一小部分子样本。空间飞行任务将允许系统地研究从0.3keV到几MeV的瞬发光谱。我们表明,观测所进行的GRB将使我们能够区分不同的模型,目前考虑的伽玛射线暴提示的研究,解决了长期悬而未决的问题,提示辐射的性质,与发射区域的位置,磁场强度和存在的热组件的相关后果。

英文摘要:

Recent advances in fitting prompt emission spectra in gamma-ray bursts (GRBs) are boosting our understanding of the still elusive origin of this radiation. These progresses have been possible thanks to a more detailed analysis of the low-energy part ($<$\,100\,keV) of the prompt spectrum, where the spectral shape is sometimes found to deviate from a simple power-law shape. This deviation is well described by a spectral break or, alternatively by the addition of a thermal component. Spectral data extending down to less than 1\,keV are extremely relevant for these studies, but presently they are available only for a small subsample of {\it Swift} GRBs observed by XRT (the X-ray telescope, 0.3-10\,keV) during the prompt emission. The space mission þ will allow a systematic study of prompt spectra from 0.3\,keV to several MeV. We show that observations performed by þ will allow us to discriminate between different models presently considered for GRB prompt studies, solving the long-standing open issue about the nature of the prompt radiation, with relevant consequences on the location of the emitting region, magnetic field strength and presence of thermal components.

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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