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Statistical properties of the highest pulses in gamma-ray bursts
Tan YP(覃一平)1; Liang EW(梁恩维)1,2; Xie GZ(谢光中)1; Su CY(苏成悦)1,3; Qin, YP (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
2003-02
卷号3期号:1页码:38-48
DOI10.1088/1009-9271/3/1/38
分类号P17
产权排序第1完成单位
收录类别SCI
关键词Gamma Rays : Bursts Methods : Data Analysis
摘要We study the statistical properties of the highest pulses within individual gamma-ray bursts (GRBs). A wavelet package analysis technique and a developed pulse-finding algorithm have been applied to identify the highest pulses from burst profiles observed by BATSE on board CGRO from 1991 April 21 to 1999 January 26. The statistical light curves of the highest pulses in four energy channels have been derived by an aligning method, which illustrate the temporal evolution of the pulse emission. Our result that narrower pulses go with higher energies is consistent with previous findings. By normalizing both the pulse durations and counts to unity, "characteristic" profiles of the highest pulses in the four channels are also derived. The four characteristic profiles are turned out to be almost the same, thus strongly support the previous conclusion that the temporal profiles in different energy channels are self-similar and the previous conjecture on GRB pulses, implying that the emission process is similar at different energies. The cosmological time dilation effect is examined by investigating the relationship between the pulse flux and pulse duration. An anti-correlation between the two was found, which agrees with the expectation of the cosmological time dilation effect. Also, the evolution of the pulse duration with the observational epoch is studied. The result shows that the pulse duration tends to be shorter in later epochs. This trend cannot be explained by the present theoretical models, and may represent a great challenge to current theories.
项目资助者Supported by the National Natural Science Foundation of China.
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2003-04-15
WOS记录号WOS:000181239600004
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]COSMOLOGICAL TIME DILATION ; ENERGY INJECTION ; AFTERGLOWS ; EVOLUTION ; DURATION ; LONG ; DISTRIBUTIONS ; PROGENITORS ; FIREBALLS ; REMNANTS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6963
专题星系研究组
通讯作者Qin, YP (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, China
3.Department of Physics, Guangdong Industry University, Guangzhou 510643, China
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Tan YP,Liang EW,Xie GZ,et al. Statistical properties of the highest pulses in gamma-ray bursts[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2003,3(1):38-48.
APA Tan YP,Liang EW,Xie GZ,Su CY,&Qin, YP .(2003).Statistical properties of the highest pulses in gamma-ray bursts.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,3(1),38-48.
MLA Tan YP,et al."Statistical properties of the highest pulses in gamma-ray bursts".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 3.1(2003):38-48.
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