Sequences in the hardness ratio-peak energy plane of gamma-ray bursts

doi:10.1088/1009-9271/5/2/005

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	Sequences in the hardness ratio-peak energy plane of gamma-ray bursts
	Cui XH(崔晓红)1,4 ; Liang EW(梁恩维)1,2,3 ; Lu RJ(陆睿静)1,2,4 ; Cui, XH (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
发表期刊	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2005-04
卷号	5 期号:2 页码:151-158
DOI	10.1088/1009-9271/5/2/005
产权排序	第1完成单位
收录类别	SCI
关键词	Gamma Ray : Bursts Gamma Ray : Observations Methods : Statistical
摘要	The narrowness of the distribution of the peak energy of the vF(v) spectrum of gamma-ray bursts (GRBs) and the unification of GRB populations are great puzzles yet to be solved. We investigate the two puzzles based on the global spectral behaviors of different GRB populations, the long GRBs, the short GRBs, and the X-ray flashes (XRFs), in the HR - E(p) plane (HR the spectral hardness ratio) with BATSE and HETE-2 observations. It is found that the long GRBs and the XRFs observed by HETE-2 seem to follow the same sequence in the HR - E(p) plane, with the XRFs at the low end of this sequence. We fit the sequence by a universal Band function, and find that this sequence is mainly defined by the low energy index a, and is insensitive to the high energy index, beta. With fixed beta = -5, a best fit is given by alpha = -1.00 with x(min)(2)/dof = 2.2. The long and short GRBs observed by BATSE follow significantly different sequences in the m HR - E(p) plane, with most of the short GRBs having a larger hardness ratio than the long GRBs at a given E(p). For the long GRBs a best-fit yields alpha = -0.30 and beta = -2.05. For the short GRBs, a best fit gives alpha = -0.60 with x(min)(2) = 1.1 (with beta fixed at -2.0 because it is numerically unstable). The a value for the short GRBs is significantly greater than that for the long GRBs. These results indicate that the global spectral behaviors of the long GRB; sample and the XRF sample are similar, while that of the short GRBs is different. The short GRBs seem to be a unique subclass of GRBs, and they are not the higher energy extension of the long GRBs.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	1009-9271
URL	查看原文
归档日期	2005-04-14
WOS记录号	WOS:000228645800005
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	JET MODEL ; SPECTRA ; AFTERGLOWS ; FLASHES ; UNIVERSAL ; LONG
引用统计	被引频次：11[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/6994
专题	星系研究组
通讯作者	Cui, XH (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011 2.Department of Physics, Guangxi University, Nanning 530004 3.Department of Astronomy, Nanjing University, Nanjing 210093 4.Graduate School of the Chinese Academy of Sciences, Beijing 100039
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Cui XH,Liang EW,Lu RJ,et al. Sequences in the hardness ratio-peak energy plane of gamma-ray bursts[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2005,5(2):151-158.
APA	Cui XH,Liang EW,Lu RJ,&Cui, XH .(2005).Sequences in the hardness ratio-peak energy plane of gamma-ray bursts.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,5(2),151-158.
MLA	Cui XH,et al."Sequences in the hardness ratio-peak energy plane of gamma-ray bursts".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 5.2(2005):151-158.

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