论文标题

通过有监督的机器学习来确定伽马射线爆发的物理起源

Identifying the physical origin of gamma-ray bursts with supervised machine learning

论文作者

Luo, Jia-Wei, Wang, Fei-Fei, Zhu-Ge, Jia-Ming, Li, Ye, Zou, Yuan-Chuan, Zhang, Bing

论文摘要

伽马射线爆发(GRB)的经验分类已根据其持续时间为长而短的GRB。这种经验分类通常与源自紧凑型二进制合并和GRB的GRB的物理分类有关,该二进制合并和GRB源自大规模恒星倒塌或I型和II GRB,其中大多数属于I型的短GRB,大多数属于I型的长GRB,属于II型。但是,长和短的GRB的持续时间分布存在显着重叠。此外,已经报道了一些混合的GRB,即II型短期和长期I型GRB。显然需要一种GRB的多参数分类方案。在本文中,我们试图通过有监督的机器学习方法(主要是XGBOOST)构建这样的分类方案。我们利用GRB大表格和Greiner的GRB目录,将输入特征分为三个子组:及时发射,余辉和主机星系。我们发现及时发射亚组在区分I型和II GRB方面表现最好。我们还发现,迅速发射中最重要的区别功能是T_ {90},硬度比和VUTURES。构建机器学习模型后,我们将其应用于当前未分类的GRB,以预测其成为GRB类的概率,并且我们将每个GRB的最可能类分配给其物理类别。

The empirical classification of gamma-ray bursts (GRBs) into long and short GRBs based on their durations is already firmly established. This empirical classification is generally linked to the physical classification of GRBs originating from compact binary mergers and GRBs originating from massive star collapses, or Type I and II GRBs, with the majority of short GRBs belonging to Type I and the majority of long GRBs belonging to Type II. However, there is a significant overlap in the duration distributions of long and short GRBs. Furthermore, some intermingled GRBs, i.e., short-duration Type II and long-duration Type I GRBs, have been reported. A multi-parameter classification scheme of GRBs is evidently needed. In this paper, we seek to build such a classification scheme with supervised machine learning methods, chiefly XGBoost. We utilize the GRB Big Table and Greiner's GRB catalog and divide the input features into three subgroups: prompt emission, afterglow, and host galaxy. We find that the prompt emission subgroup performs the best in distinguishing between Type I and II GRBs. We also find the most important distinguishing feature in prompt emission to be T_{90}, hardness ratio, and fluence. After building the machine learning model, we apply it to the currently unclassified GRBs to predict their probabilities of being either GRB class, and we assign the most probable class of each GRB to be its possible physical class.

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