Spectral lags and the energy dependence of pulse width in gamma-ray bursts: contributions from the relativistic curvature effect

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	Spectral lags and the energy dependence of pulse width in gamma-ray bursts: contributions from the relativistic curvature effect
	Shen RF(申荣锋); Song LM(宋黎明); Li Z(黎卓); Shen, RF; Song, LM; Li, Z
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2005
卷号	362 期号:1 页码:#REF!
关键词	relativity gamma-rays : bursts gamma-rays : theory
通讯作者	Shen, RF (reprint author), Univ Texas, Dept Astron, Austin, TX 78712 USA.
英文摘要	We compute the temporal profiles of the gamma-ray burst pulse in the four Burst and Transient Source Experiment (BATSE) Large Area Detector (LAD) discriminator energy channels, with the relativistic curvature effect of an expanding fireball being explicitly investigated. Assuming an intrinsic 'Band' shape spectrum and an intrinsic energy-independent emission profile, we show that merely the curvature effect can produce detectable spectral lags if the intrinsic pulse profile has a gradually decaying phase. We examine the spectral lag's dependences on some physical parameters, such as the Lorentz factor Gamma, the low-energy spectral index, alpha, of the intrinsic spectrum, the duration of the intrinsic radiation t' and the fireball radius R. It is shown that approximately the lag alpha Gamma(-1) and alpha t'(d) and a spectrum with a more extruded shape (a larger a) causes a larger lag. We find no dependence of the lag on R. Quantitatively, the lags produced from the curvature effect are marginally close to the observed ones, while larger lags require extreme physical parameter values, e.g. Gamma < 50, or alpha > -0.5. The curvature effect causes an energy-dependent pulse width distribution but the energy dependence of the pulse width we obtained is much weaker than the observed W proportional to E-0.4 one. This indicates that some intrinsic mechanism(s), other than the curvature effect, dominates the pulse narrowing of gamma-ray bursts.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
收录类别	SCI
WOS记录号	WOS:000231803500005
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/225821]
专题	高能物理研究所_粒子天体物理中心
推荐引用方式 GB/T 7714	Shen RF,Song LM,Li Z,et al. Spectral lags and the energy dependence of pulse width in gamma-ray bursts: contributions from the relativistic curvature effect[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2005,362(1):#REF!.
APA	申荣锋,宋黎明,黎卓,Shen, RF,Song, LM,&Li, Z.(2005).Spectral lags and the energy dependence of pulse width in gamma-ray bursts: contributions from the relativistic curvature effect.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,362(1),#REF!.
MLA	申荣锋,et al."Spectral lags and the energy dependence of pulse width in gamma-ray bursts: contributions from the relativistic curvature effect".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 362.1(2005):#REF!.