Relationship between width of pulses and Lorentz factor expected from the light curve of fireball sources

	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
刊名	CHINESE PHYSICS
	2005-11
卷号	14 期号:11 页码:2276-2286
关键词	gamma-ray bursts gamma-rays relativity
ISSN号	1009-1963
通讯作者	Zhang, FW (reprint author), Natl Astron Observ, Yunnan Observ, Chinese Acad Sci, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	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.
学科主题	Physics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Physics, Multidisciplinary
研究领域[WOS]	Physics
关键词[WOS]	GAMMA-RAY BURSTS ; POWER-DENSITY SPECTRA ; INTERNAL SHOCK MODEL ; BATSE OBSERVATIONS ; RELATIVISTIC SHELLS ; TEMPORAL BEHAVIOR ; TIME PROFILES ; EVOLUTION ; BRIGHT ; SPECTROSCOPY
收录类别	SCI ; EI
原文出处	http://iopscience.iop.org/1009-1963/14/11/023/
语种	英语
WOS记录号	WOS:000233176500023
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6986]
专题	云南天文台_星系研究组
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. 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.(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.