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Relationship between width of pulses and Lorentz factor expected from the light curve of fireball sources
Zhang FW(张富文)1,2,3; Tan YP(覃一平)1,2; Zhang, FW (reprint author), Natl Astron Observ, Yunnan Observ, Chinese Acad Sci, Kunming 650011, Peoples R China.
发表期刊CHINESE PHYSICS
2005-11
卷号14期号:11页码:2276-2286
DOI10.1088/1009-1963/14/11/023
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收录类别SCI ; EI
关键词Gamma-ray Bursts Gamma-rays Relativity
摘要Time profiles of many gamma-ray bursts consist of distinct pulses, which provides a possibility of characterizing the temporal structure of these bursts. We employ a simple model of highly symmetric fireballs to analyse the effect of the expansion speed on the light curve arising from different forms of local pulses. The relationship between the ratio r of the FWHM width of the rising phase of the light curve to that of the decaying phase and the Lorentz factor is investigated. The analysis shows that, when the rest frame radiation form is ignored, temporal profiles of the light curve arising from pulses of fireballs will not be affected by the expansion speed (that is, r is almost a constant) as long as the fireball expands relativistically. When the rest frame radiation form is taken into account, there will be a break in the curves of r - log Gamma. The location of the break depends mainly on the adopted value of the rest frame peak frequency v(0,p). One would reach almost the same result when a jet is considered. In addition, we utilize a sample of 48 individual GRB pulses to check the relationship between the ratio r and the expansion speed Gamma. We find no significant correlation between them, and this is consistent with the theoretical analysis.
语种英语
学科领域Physics
文章类型Article
ISSN1009-1963
URL查看原文
归档日期2005-12-28
WOS记录号WOS:000233176500023
WOS研究方向Physics
WOS类目Physics, Multidisciplinary
关键词[WOS]GAMMA-RAY BURSTS ; POWER-DENSITY SPECTRA ; INTERNAL SHOCK MODEL ; BATSE OBSERVATIONS ; RELATIVISTIC SHELLS ; TEMPORAL BEHAVIOR ; TIME PROFILES ; EVOLUTION ; BRIGHT ; SPECTROSCOPY
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6986
专题星系研究组
通讯作者Zhang, FW (reprint author), Natl Astron Observ, Yunnan Observ, Chinese Acad Sci, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
2.Physics Department, Guangxi University, Nanning 530004, China
3.Graduate School of The Chinese Academy of Sciences, Beijing 100049, China
推荐引用方式
GB/T 7714
Zhang FW,Tan YP,Zhang, FW . Relationship between width of pulses and Lorentz factor expected from the light curve of fireball sources[J]. CHINESE PHYSICS,2005,14(11):2276-2286.
APA Zhang FW,Tan YP,&Zhang, FW .(2005).Relationship between width of pulses and Lorentz factor expected from the light curve of fireball sources.CHINESE PHYSICS,14(11),2276-2286.
MLA Zhang FW,et al."Relationship between width of pulses and Lorentz factor expected from the light curve of fireball sources".CHINESE PHYSICS 14.11(2005):2276-2286.
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