Qin, Yi-Ping 2014 以是否满足Amati关系为标准对伽马暴分类

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是满足两个不同系数的Amati关系。

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Title:		Statistical classification of gamma-ray bursts based on the Amati relation
Authors:		Qin, Yi-Ping; Chen, Zhi-Fu
Affiliation:		AA(Center for Astrophysics, Guangzhou University, Guangzhou 510006, China; Department of Physics and Telecommunication Engineering, Baise University, Baise, Guangxi 533000, China; Physics Department, Guangxi University, Nanning 530004, China; ypqin@126.com), AB(Center for Astrophysics, Guangzhou University, Guangzhou 510006, China; Department of Physics and Telecommunication Engineering, Baise University, Baise, Guangxi 533000, China)
Publication:		Monthly Notices of the Royal Astronomical Society, Volume 430, Issue 1, p.163-173 (MNRAS Homepage)
Publication Date:		03/2013
Origin:		OUP
Astronomy Keywords:		methods: statistical, gamma-ray burst: general, stars: late-type, stars: massive, supernovae: general, gamma-rays: general
Abstract Copyright:		2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:		10.1093/mnras/sts547
Bibliographic Code:		2013MNRAS.430..163Q

Abstract

Gamma-ray bursts (GRBs) are believed to belong to two classes and they are conventionally divided according to their durations. This classification scheme is not satisfied due to the fact that duration distributions of the two classes are heavily overlapped. We collect a new sample (153 sources) of GRBs and investigate the distribution of the logarithmic deviation of the E_p value from the Amati relation. The distribution possesses an obvious bimodality structure and it can be accounted for by the combination of two Gaussian curves. Based on this analysis, we propose to statistically classify GRBs in the well-known E_p versus E_iso plane with the logarithmic deviation of the E_p value. This classification scheme divides GRBs into two groups: Amati type bursts and non-Amati type bursts. While Amati type bursts follow the Amati relation, non-Amati type bursts do not. It shows that most Amati type bursts are long duration bursts and the majority of non-Amati type bursts are short duration bursts. In addition, it reveals that Amati type bursts are generally more energetic than non-Amati type bursts. An advantage of the new classification is that the two kinds of burst are well distinguishable and therefore their members can be identified in certainty.

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