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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
DOI10.1088/1009-9271/5/2/005
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
ISSN1009-9271
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
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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
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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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