Statistical Properties of the Highest Pulses in Gamma-Ray Bursts

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	Statistical Properties of the Highest Pulses in Gamma-Ray Bursts
	Qin Yiping; Liang Enwei; Xie Guangzhong; Su Chengyue
刊名	Chinese Journal of Astronomy and Astrophysics
	2003
卷号	3 期号:1 页码:38
ISSN号	1009-9271
英文摘要	We study the statistical properties of the highest pulses within individualgamma-ray bursts (GRBs). A wavelet package analysis technique and a developedpulse-finding algorithm have been applied to identify the highest pulses from burstprofiles observed by BATSE on board CGRO from 1991 April 21 to 1999 January26. The statistical light curves of the highest pulses in four energy channels havebeen derived by an aligning method, which illustrate the temporal evolution of thepulse emission. Our result that narrower pulses go with higher energies is consistentwith previous findings. By normalizing both the pulse durations and counts tounity, "characteristic" profiles of the highest pulses in the four channels are alsoderived. The four characteristic profiles are turned out to be almost the same,thus strongly support the previous conclusion that the temporal profiles in differentenergy channels are self-similar and the previous conjecture on GRB pulses, implyingthat the emission process is similar at different energies. The cosmological timedilation effect is examined by investigating the relationship between the pulse fluxand pulse duration. An anti-correlation between the two was found, which agreeswith the expectation of the cosmological time dilation effect. Also, the evolutionof the pulse duration with the observational epoch is studied. The result showsthat the pulse duration tends to be shorter in later epochs. This trend cannot beexplained by the present theoretical models, and may represent a great challenge tocurrent theories.
语种	英语
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/48297]
专题	中国科学院国家天文台
作者单位	中国科学院国家天文台
推荐引用方式 GB/T 7714	Qin Yiping,Liang Enwei,Xie Guangzhong,et al. Statistical Properties of the Highest Pulses in Gamma-Ray Bursts[J]. Chinese Journal of Astronomy and Astrophysics,2003,3(1):38.
APA	Qin Yiping,Liang Enwei,Xie Guangzhong,&Su Chengyue.(2003).Statistical Properties of the Highest Pulses in Gamma-Ray Bursts.Chinese Journal of Astronomy and Astrophysics,3(1),38.
MLA	Qin Yiping,et al."Statistical Properties of the Highest Pulses in Gamma-Ray Bursts".Chinese Journal of Astronomy and Astrophysics 3.1(2003):38.