Origination of gamma-ray burst pulses associated with the Doppler effect of spherical fireballs or uniform jet

	Origination of gamma-ray burst pulses associated with the Doppler effect of spherical fireballs or uniform jet
	Lu, RJ1 ; Tan YP(覃一平)1,2,3 ; Zhang FW(张富文)3,4
刊名	CHINESE PHYSICS
	2007-06
卷号	16 期号:6 页码:1806-1816
关键词	amma-ray bursts gamma-rays
ISSN号	1009-1963
通讯作者	Lu, RJ
产权排序	第三完成单位
英文摘要	Ryde and Petrosian have pointed out that the rise phases of gamma-ray burst (GRB) pulses originate from the widths of the intrinsic pulses and their decay phases are determined by the curvature effect of the expanding fireball surface based on their simplified formula. In this paper we investigate in detail the issue based on the formula in Ref.[20], which is derived based on a model of highly symmetric expanding fireballs, where the Doppler effect is the key factor to be concerned about, and no terms are omitted in their derivation. Our analyses show that the decay phases of the observed pulses originate from the contributions from both the curvature effect of the expanding fireball and the two time scales of the local pulses, and the rise phases of the observed pulses only come from the two time scales of the local pulses. Associated with a local pulse with both rise and decay portions, the light curve of GRBs in the rise portion is expected to undergo a concave phase and then a convex one, whereas that in the decay portion is expected to evolve by an opposite process. And the ratio of the concave time scale to the convex one in the rise phase of the observed pulse linearly increases with the ratio of the rising time scale to the decay one of the local pulse (rrd), whereas the ratio of the convex tim escale to the concave time scale in its decay phase linearly decreases with rrd. The two correlations are independent of the local pulse forms and the rest-frame radiation forms. But the different forms of local pulses and the different values of rrd gives rise to the diversity of the light curve pulse shapes. We test a sample of 86 GRB pulses detected by the BATSE instrument on board the Compton Gamma Ray Observatory and find that the characteristics do exist in the light curve of GRBs.
学科主题	Physics
类目[WOS]	Physics, Multidisciplinary
研究领域[WOS]	Physics
关键词[WOS]	BATSE OBSERVATIONS ; TIME PROFILES ; SPECTRAL CATALOG ; LIGHT CURVES ; ENERGY ; BRIGHT ; EMISSION ; WIDTH ; SPECTROSCOPY ; SIGNATURES
收录类别	SCI ; EI
原文出处	http://iopscience.iop.org/1009-1963/16/6/055/
语种	英语
WOS记录号	WOS:000247045100055
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/7024]
专题	云南天文台_星系研究组
作者单位	1.Physical Science & Technology college, Guangxi University, Nanning 530004, China 2.Center for Astrophysics, Guangzhou University, Guangzhou 510006, China 3.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China 4.The Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
推荐引用方式 GB/T 7714	Lu, RJ,Tan YP,Zhang FW. Origination of gamma-ray burst pulses associated with the Doppler effect of spherical fireballs or uniform jet[J]. CHINESE PHYSICS,2007,16(6):1806-1816.
APA	Lu, RJ,Tan YP,&Zhang FW.(2007).Origination of gamma-ray burst pulses associated with the Doppler effect of spherical fireballs or uniform jet.CHINESE PHYSICS,16(6),1806-1816.
MLA	Lu, RJ,et al."Origination of gamma-ray burst pulses associated with the Doppler effect of spherical fireballs or uniform jet".CHINESE PHYSICS 16.6(2007):1806-1816.