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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.
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2005-11-11
卷号363期号:4页码:1290-1298
DOI10.1111/j.1365-2966.2005.09530.x
产权排序第1完成单位
收录类别SCI
关键词Methods : Numerical Gamma-rays : Bursts
摘要Kocevski, 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).
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0035-8711
URL查看原文
归档日期2005-11-09
WOS记录号WOS:000232867000021
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]TEMPORAL PROPERTIES ; TIME PROFILES ; VARIABILITY ; SPECTRA ; SIGNATURES ; EVOLUTION ; BEHAVIOR ; MODEL
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被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6985
专题星系研究组
通讯作者Zhang, ZB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
作者单位1.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
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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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