Can the bump in the composite spectrum of GRB 910503 be an emission line feature of gamma-ray bursts?

	Can the bump in the composite spectrum of GRB 910503 be an emission line feature of gamma-ray bursts?
	Tan YP(覃一平)1,2 ; Zhang FW(张富文)1,2,3
刊名	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2005
卷号	5 期号:6 页码:627-635
关键词	gamma-rays : bursts gamma-rays : theory radiation mechanisms : nonthermal relativity
ISSN号	1009-9271
通讯作者	Qin, YP (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	Appearing in the composite spectral data of BATSE, EGRET and COMPTEL for GRB 910503, there is a bump at around 1600 keV. We perform a statistical analysis on the spectral data, trying to find out if the bump could be accounted for by a blue-shifted and significantly broadened rest frame line due to the Doppler effect of an expanding fireball surface. We made an F-test and adopted previously proposed criteria. The study reveals that the criteria are well satisfied and the feature can be interpreted as the blue shifted 6.4 keV line. From the fit with this line taken into account, we find the Lorentz factor of this source to be Gamma =- 116(-9)(+9) (at the 68% confident level, Delta chi(2) = 1) and the rest frame spectral peak energy to be E-0,E-p = 2.96(-0.18)(+0.24) keV. Although the existence of the emission line feature requires other independent tests to confirm, the analysis suggests that it is feasible to detect emission line features in the high energy range of GRB spectra when taking into account the Doppler effect of fireball expansion.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	EXTERNAL MATTER ; ABSORPTION ; MODELS ; AFTERGLOW ; MOTION ; IMPACT
收录类别	SCI
原文出处	http://iopscience.iop.org/1009-9271/5/6/009/
语种	英语
WOS记录号	WOS:000234124400009
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6997]
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 2.Physics Department, Guangxi University, Nanning 530004 3.Graduate University of Chinese Academy of Sciences, Beijing 100049
推荐引用方式 GB/T 7714	Tan YP,Zhang FW. Can the bump in the composite spectrum of GRB 910503 be an emission line feature of gamma-ray bursts?[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2005,5(6):627-635.
APA	Tan YP,&Zhang FW.(2005).Can the bump in the composite spectrum of GRB 910503 be an emission line feature of gamma-ray bursts?.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,5(6),627-635.
MLA	Tan YP,et al."Can the bump in the composite spectrum of GRB 910503 be an emission line feature of gamma-ray bursts?".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 5.6(2005):627-635.