伽玛暴的分类:在休息帧的光谱峰能量持续平面上寻找第三类

IF 5.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Anastasia Tsvetkova, Lorenzo Amati, Mattia Bulla, Luciano Burderi, Dmitry Frederiks, Filippo Frontera, Cristiano Guidorzi, Alessandro Riggio, Tiziana di Salvo, Andrea Sanna, Fyodor Sviridov
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引用次数: 0

摘要

上下文。两类伽玛射线暴(grb)对应于短硬事件和长软事件,以及假定的中间类别,通常在观测者框架中被考虑。然而,当在宇宙学静止框架中考虑GRB的特征时,这两类之间的界限变得模糊了。本研究的目的是检查第三类“中间”grb的证据,并研究从观察者到静止框架的转换如何影响基于硬度持续时间的分类。我们将偏斜和非偏斜(对称)高斯分布和学生分布的拟合应用于409个具有可靠红移测量的grb样本,以在硬度(Ep) -持续时间(T90)平面上对爆发进行聚类。我们发现,基于AIC/BIC标准,GRB静止帧硬度-持续时间平面上的统计优选簇数不超过2个。我们还评估了聚类技术的鲁棒性。我们没有发现任何确凿的证据表明在静止帧硬度持续时间平面上存在中级GRB类。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Gamma-ray burst taxonomy: Looking for the third class on the spectral peak energy-duration plane in the rest frame
Context. Two classes of gamma-ray bursts (GRBs) corresponding to the short-hard and the long-soft events, with a putative intermediate class, are typically considered in the observer frame. However, when considering GRB characteristics in the cosmological rest frame, the boundary between the classes becomes blurred.Aims. The goal of this research is to check for evidences of a third ‘intermediate’ class of GRBs and investigate how the transformation from the observer to the rest frame affects the hardness-duration-based classification.Methods. We applied fits with skewed and non-skewed (symmetric) Gaussian and Student distributions to a sample of 409 GRBs with reliably measured redshifts to cluster the bursts on the hardness (Ep) – duration (T90) plane.Results. We find that based on AIC/BIC criteria, the statistically preferred number of clusters on the GRB rest-frame hardness-duration plane does not exceed two. We also assessed the robustness of the clustering technique.Conclusions. We did not find any solid evidence of an intermediate GRB class on the rest-frame hardness-duration plane.
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来源期刊
Astronomy & Astrophysics
Astronomy & Astrophysics 地学天文-天文与天体物理
CiteScore
10.20
自引率
27.70%
发文量
2105
审稿时长
1-2 weeks
期刊介绍: Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.
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