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arXiv 2201.10861astro-ph.HE
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伽马射线暴的三参数紧密相关及分类

A Tight Three-parameter Correlation and Related Classification on Gamma-Ray Bursts

Shuai Zhang, Lang Shao, Bin-Bin Zhang, Jin-Hang Zou, Hai-Yuan Sun, Yu-Jie Yao, Lin-Lin Li

摘要:

伽马射线暴(GRB)被广泛认为是来自大质量的双星和/或紧凑的双星合并,因此,将分别产生长和短的GRB。由于我们获得的观测数据越来越多,关于这种分类方案的细节一直在不断辩论。在这项工作中,我们应用了一系列的数据挖掘方法来研究所发现的伽玛暴的费米伽马射线暴监测器的瞬发辐射中包含的潜在的分类信息。发现注量($f$)、峰值通量($F$)和瞬发持续时间($T_{90}$)之间存在紧密的全局相关性,其形式为$ \log {\it f}= 0.75 \log T_{90} +0.92 \log F -7.14$。基于这种相关性,我们可以定义一个新的参数$L = 1.66\log T_{90} + 0.84 \log {\it f} - 0.46 \log F + 3.24$的线性判别分析,将区分长和短的伽玛暴与更少的模糊性比$T_{90}$。我们还讨论了基于高斯混合模型的聚类分析所得到的伽玛暴的三个子类分类方案,并提出除了SGRB外,LGRB还可以分为长亮伽马射线暴(LBGRB)和长暗伽马射线暴(LFGRB),LBGRB的$f$和$F$在统计学上高于LFGRB,进一步的统计分析发现LBGRB的伽玛暴脉冲数也高于LFGRB。

英文摘要:

Gamma-ray bursts (GRBs) are widely believed to be from massive collapsars and/or compact binary mergers, which accordingly, would generate long and short GRBs, respectively. The details on this classification scheme have been in constant debate given more and more observational data available to us. In this work, we apply a series of data mining methods to studying the potential classification information contained in the prompt emission of GRBs detected by the Fermi Gamma-ray Burst Monitor. A tight global correlation is found between fluence ($f$), peak flux ($F$) and prompt duration ($T_{90}$) which takes the form of $ \log {\it f}= 0.75 \log T_{90} +0.92 \log F -7.14$. Based on this correlation, we can define a new parameter $L = 1.66\log T_{90} + 0.84 \log {\it f} - 0.46 \log F + 3.24$ by linear discriminant analysis that would distinguish between long and short GRBs with much less ambiguity than $T_{90}$. We also discussed the three subclasses scheme of GRB classification derived from clusters analysis based on a Gaussian mixture model, and suggest that, besides SGRBs, LGRBs may be divided into long-bright gamma-ray bursts (LBGRBs) and long-faint gamma-ray bursts (LFGRBs), LBGRBs have statistical higher $f$ and $F$ than LFGRBs; further statistical analysis found that LBGRBs also have higher number of GRB pulses than LFGRBs.

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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