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Statistical Properties of the Highest Pulses in Gamma-Ray Bursts
Qin Yiping; Liang Enwei; Xie Guangzhong; Su Chengyue
2003
Source PublicationChinese Journal of Astronomy and Astrophysics
ISSN1009-9271
Volume3Issue:1Pages:38
AbstractWe 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.
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/48298
Collection中国科学院国家天文台
Affiliation中国科学院国家天文台
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
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.
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