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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; Qin, YP (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
发表期刊CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
2005
卷号5期号:6页码:627-635
DOI10.1088/1009-9271/5/6/009
产权排序第1完成单位
收录类别SCI
关键词Gamma-rays : Bursts Gamma-rays : Theory Radiation Mechanisms : Nonthermal Relativity
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.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1009-9271
URL查看原文
归档日期2005-12-28
WOS记录号WOS:000234124400009
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]EXTERNAL MATTER ; ABSORPTION ; MODELS ; AFTERGLOW ; MOTION ; IMPACT
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6997
专题星系研究组
通讯作者Qin, YP (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
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
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Tan YP,Zhang FW,Qin, YP . 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,&Qin, YP .(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.
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