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arXiv 1912.09810astro-ph.HE
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Ep,i-Eiso相关:I型伽马射线暴和新的分类方法

The Ep,i - Eiso correlation: type I gamma-ray bursts and the new classification method

P. Y. Minaev, A. S. Pozanenko

摘要:

我们提出了最广泛的45个I型(短)和275个II型(长)伽马射线暴(GRB)与已知的红移调查之间的相关性的休息帧峰值能量,Ep,i和总的各向同性等效能量,Eiso的即时发射(Amati关系)。发现I型暴的Ep,i-Eiso相关性与II型暴的Ep,i-Eiso相关性有很好的区别,并且具有相似的幂律指数值a = 0.4,这可能表明两种类型的GRB具有相同的发射机制。我们发现,初始脉冲复合物(IPC)的I型爆发的扩展发射和定期的I型爆发遵循相同的相关性。我们得到类似的结果与Ic超新星和定期II型爆发的II型爆发。检测到来自II型子样本的Ep,i-Eiso相关性的三个可能的离群值。对于II型爆发,Ep,i-Eiso关联没有随红移的显著变化,我们提出了一种新的分类方法,即基于Ep,i-Eiso关联,引入两个参数EH和EHD。EHD是盲I-II分类的最可靠的参数,它可以用来分类没有红移的伽玛暴。

英文摘要:

We present the most extensive sample of 45 type I (short) and 275 type II (long) gamma-ray bursts (GRB) with known redshift to investigate the correlation between the rest frame peak energy, Ep,i and the total isotropic equivalent energy, Eiso of the prompt emission (Amati relation). The Ep,i - Eiso correlation for type I bursts is found to be well-distinguished from the one constructed for type II bursts and has a similar power-law index value, a = 0.4, which possibly indicates the same emission mechanism of both GRB types. We show that the initial pulse complex (IPC) of type I bursts with an extended emission and regular type I bursts follow the same correlation. We obtain similar results for type II bursts associated with Ic supernovae and for regular type II bursts. Three possible outliers from the Ep,i - Eiso correlation for type II subsample are detected. Significant evolution of the Ep,i - Eiso correlation with redshift for type II bursts is not found. We suggest the new classification method, based on the Ep,i - Eiso correlation and introduce two parameters, EH and EHD. EHD is found to be the most reliable parameter for the blind type I - type II classification, which can be used to classify GRBs with no redshift.

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