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Physical implication of the Kocevski-Ryde-Liang pulse function of gamma-ray bursts
Zhang ZB(张志彬)1,2; Tan YP(覃一平)1,3; Zhang, ZB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2005-11-11
Volume363Issue:4Pages:1290-1298
DOI10.1111/j.1365-2966.2005.09530.x
Contribution Rank第1完成单位
Indexed BySCI
KeywordMethods : Numerical Gamma-rays : Bursts
AbstractKocevski, Ryde & Liang have proposed a semi-empirical function (the KRL function) of gamma-ray burst (GRB) pulses, which could well describe those pulses comprising a fast rise and an exponential decay (FRED) phase. Meanwhile, a theoretical model that could give rise to this kind of pulse, based on the Doppler effect of the expanding fireball surface, has been put forward in detail by Qin and co-workers. To provide a physical explanation to the parameters of the KRL function, we try to fit light curves of the Doppler model with the KRL function so that parameters in both models can be directly related. We pay attention only to single GRB pulses whose profiles are that of FRED and hence employ the sample presented by Kocevski, Ryde & Liang (the KRL sample) to study this issue. We find from our analysis that, for light curves, which arise from exponential rise and exponential decay local pulses, of the Doppler model, the ratio of the rise index r to the decay index d, derived when fitted by the KRL function, increases quickly first. It then remains nearly invariant with the relative width (relative to the time-scale of the initial fireball radius R(c)/C) of local pulses when the width exceeds 2 (the relative width is dimensionless). The rise and decay times of pulses are found to be related to the Lorentz factor by a power law, where the power-law index associated with the rise time is less than that of the decay time, and both are close to -2. In addition, the mean asymmetry shows a slight trend of decreasing with Lorentz factors. In plots of decay indices versus asymmetry, there is a descending phase and after this phase there is a rising portion. We find that these long GRBs of the KRL sample are mainly associated with those light curves arising from comoving pulses with the relative width being larger than 0.1. We show in our analysis that the effect of the comoving pulse shape on the KRL function parameters of the resulting pulses is considerable and can be distinguished by the decay index d when the relative comoving pulse width is less than 2 (when the relative width is larger than 2, it would be difficult to discern the difference in the resulting pulse shapes).
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0035-8711
URL查看原文
Archive Date2005-11-09
WOS IDWOS:000232867000021
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordTEMPORAL PROPERTIES ; TIME PROFILES ; VARIABILITY ; SPECTRA ; SIGNATURES ; EVOLUTION ; BEHAVIOR ; MODEL
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6985
Collection星系研究组
Corresponding AuthorZhang, ZB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
Affiliation1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming, Yunnan 650011, China
2.The Graduate School of the Chinese Academy of Sciences
3.Physics Department, Guangxi University, Nanning, Guangxi 530004, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang ZB,Tan YP,Zhang, ZB . Physical implication of the Kocevski-Ryde-Liang pulse function of gamma-ray bursts[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2005,363(4):1290-1298.
APA Zhang ZB,Tan YP,&Zhang, ZB .(2005).Physical implication of the Kocevski-Ryde-Liang pulse function of gamma-ray bursts.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,363(4),1290-1298.
MLA Zhang ZB,et al."Physical implication of the Kocevski-Ryde-Liang pulse function of gamma-ray bursts".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 363.4(2005):1290-1298.
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