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arXiv 2010.00337astro-ph.HE
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扩展发射的伽马射线暴:分类、能量关联和辐射特性

Gamma-Ray Bursts with Extended Emission: Classifications, Energy Correlations and Radiation Properties

X. L. Zhang, C. T. Zhang, X. J. Li, F. F. S, X. F. Dong, H. Y. Chang, Z. B. Zhang

摘要:

由于近年来空间望远镜探测到的具有红移和扩展发射的伽马射线暴越来越多,检验这些先前的能量关联是否仍然满足只涉及伴随着尾辐射的特定样本是迫切的和可能的。利用20个长和22个短的扩展发射爆发,我们发现流行的$γ$ -射线能量关联(内禀峰值能量与各向同性能量的Amati关系)和内禀峰值能量与峰值亮度的Yonetoku关系)在短爆发和长爆发中都存在。然而,这些具有扩展发射的伽马射线暴更好地被重新分类为E-I和E-II两个子组,这使得上述能量相关性更紧密。正如Zhang等人(2018)所提出的,能量相关性也可以用于区分辐射热通量与峰值能量平面中的这些类型的伽马射线暴。有趣的是,奇特的短GRB 170817 A在注量与峰值能量平面上属于E-I群,但它是Amati和Yonetoku关系的异常值,即使离轴效应已被校正。此外,我们还比较了扩展辐射和瞬发γ射线的辐射特征,以寻找它们之间可能的联系。考虑到所有这些因素,我们得出结论,伽马射线暴扩展发射仍然需要模型与二分法组,即E-I和E-II类,分别,这表明他们可能是不同的起源。

英文摘要:

Thanks to more and more gamma-ray bursts with measured redshift and extended emission detected by the recent space telescopes, it is urgent and possible to check whether those previous energy correlations still satisfy for the particular sample involving only the bursts accompanied by tail radiations. Using 20 long and 22 short bursts with extended emission, we find that the popular $γ$-ray energy correlations of the intrinsic peak energy versus the isotropic energy (Amati relation) and the intrinsic peak energy versus the peak luminosity (Yonetoku relation) do exist in either short or long bursts. However, these gamma-ray bursts with extended emissions are much better to be reclassified into two subgroups of E-I and E-II that make the above energy correlations more tight. As proposed by Zhang et al. (2018), the energy correlations can be utilized to distinguish these kinds of gamma-ray bursts in the plane of bolometric fluence versus peak energy as well. Interestingly, the peculiar short GRB 170817A belongs to the E-I group in the fluence versus peak energy plane, but it is an outlier of both Amati and Yonetoku relations even though the off-axis effect has been corrected. Furthermore, we compare the radiation features between the extended emissions and the prompt gamma-rays in order to search for their possible connections. Taking into account all these factors, we conclude that gamma-ray bursts with extended emission are still required to model with dichotomic groups, namely E-I and E-II classes, respectively, which hints that they might be of different origins.

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