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The correlations between hardness ratios and fitting parameters in GRB spectrum
Liang EW(梁恩维)1,2,3; Xie GZ(谢光中)1,2,4; Rong, XG5; Liang, EW (reprint author), Chinese Acad Sci, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China.
发表期刊ASTROPHYSICS AND SPACE SCIENCE
2002
卷号280期号:4页码:357-368
DOI10.1023/A:1015622324180
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收录类别SCI
摘要In this paper, besides general definition of hardness ratio of gamma-ray bursts (GRBs), HR32, we also presented new definitions of hardness ratios, HRhl and HRll, then presented the results of correlation studies, examining the association between the hardness ratios and the spectral fitting parameters (E-0 or E-peak, alpha, beta) by using the GRB data observed by BATSE. The HRhl is defined as the fluence of channel 4 divided by the sum of the fluences of channels 1 to 3, and the HRll is defined as the fluence of channel 3 divided by the sum of the fluences of channel 1 and 2. We found that E-0 and E-peak are correlated with hardness ratios, and beta is only correlated with log (HRhl). The alpha is not correlated with any hardness ratios in the total sample of GRBs, while it correlated with log (HRll) and log (HR32) in the two subsets seperated at log (HRll) = 0.34 x alpha +0.66, respectively. These results show that a harder spectra tends to be steeper and has a higher E-peak or E-0; HRhl describes the spectral behaviors in high energy, while both of HRll and HR32 reflect the spectral characteristics in low energy; the spectral behaviors in low energy are different for the two subsets. We also presented a brief qualitative analysis discussion to the correlations and suggested that the correlations are caused by both of intrinsic and cosmological effects, but intrinsic effects are dominant.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-640X
URL查看原文
归档日期2002-08-13
WOS记录号WOS:000175807100005
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]GAMMA-RAY BURSTS ; BATSE OBSERVATIONS ; PEAK
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6954
专题星系研究组
通讯作者Liang, EW (reprint author), Chinese Acad Sci, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China.
作者单位1.Yunnan Observatory, Chinese Academy of Sciences, Kunming, Yunnan, 650011, P. R. China
2.National Astronomical Observatories, Chinese Academy of Sciences, P. R. China
3.Physics Department, Guangxi University, Nanning, Guangxi, 530004, P. R. China
4.Yunnan Astrophysics Center, Yunnan University, Kunming, Yunnan 650091, P. R. China
5.Department of Physics, Guangxi Normal University, Guilin, Guangxi, 541004, P. R. China
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GB/T 7714
Liang EW,Xie GZ,Rong, XG,et al. The correlations between hardness ratios and fitting parameters in GRB spectrum[J]. ASTROPHYSICS AND SPACE SCIENCE,2002,280(4):357-368.
APA Liang EW,Xie GZ,Rong, XG,&Liang, EW .(2002).The correlations between hardness ratios and fitting parameters in GRB spectrum.ASTROPHYSICS AND SPACE SCIENCE,280(4),357-368.
MLA Liang EW,et al."The correlations between hardness ratios and fitting parameters in GRB spectrum".ASTROPHYSICS AND SPACE SCIENCE 280.4(2002):357-368.
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