Lv, Houjun 2010 一个新的伽马暴分类方法

主要内容:
E_{gamma, iso,52}/E^{5/3}_{p,z,2}
这里的5/3是为了将红移z去掉。

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Title:		A New Classification Method for Gamma-Ray Bursts
Authors:		Lv, Houjun; Liang, Enwei; Zhang, Binbin; Zhang, Bing
Publication:		eprint arXiv:1001.0598
Publication Date:		01/2010
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		5 pages, including 3 figures and 1 Table, submitted to ApJ Letters
Bibliographic Code:		2010arXiv1001.0598L

Abstract

The traditional long vs. short GRB classification scheme is found not always to match the physical classification scheme Type II (massive star origin) vs. Type I (compact star mergers), respectively. We propose a new classification method of GRBs by introducing a new parameter varepsilon=E_{gamma, iso,52}/E^{5/3}_{p,z,2}, where E_{gamma, iso,52} is the isotropic gamma-ray energy (in units of 10^{52} erg), and E_{p,z} is the cosmic rest frame spectral peak energy (in units of 100 keV). For those GRBs with "extended emission", both quantities are defined for the short/hard spike only. The varepsilon parameter shows a clear bimodal distribution with a separation at varepsilon ~ 0.03. The high-varepsilon region encloses all the high-luminosity long GRBs including the high-z GRBs with intrinsic short durations (such as GRB 090423 and GRB 080913) as well as some high-z short GRBs (such as GRB 090426), which matches the Type II GRBs very well. The low-varepsilon region is represented by all known Type I GRBs and some low luminosity long GRBs. With an additional criterion T_{90,z}< 5 s in the Swift/BAT band, a Type I GRB can be identified in the low-varepsilon region at 3 sigma confidence level. We suggest that the new classification scheme can better match the physically-motivated Type II/I classification scheme.

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