Rapid fading of optical afterglows as evidence for beaming in gamma-ray bursts
Huang, YF; Dai, ZG; Lu, T
刊名ASTRONOMY & ASTROPHYSICS
2000
卷号355期号:3页码:L43-L46
关键词gamma rays : bursts ISM : jets and outflows stars : neutron relativity
学科分类Astronomy & Astrophysics
通讯作者Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China ; Nanjing Univ, Astron & Astrophys Ctr E China, Nanjing 210093, Peoples R China ; Chinese Acad Sci, IHEP, Beijing 100039, Peoples R China
文章类型Letter
英文摘要Based on the refined dynamical model proposed by us earlier for beamed gamma-ray burst ejecta, we carry out detailed numerical procedure to study those gamma-ray bursts with rapidly fading afterglows (i.e., similar to t(-2)). It is found that optical afterglows from GRB 970228, 980326, 980519, 990123, 990510 and 991208 can be satisfactorily fitted if the gamma-ray burst ejecta are highly collimated, with a universal initial half opening angle theta(0) similar to 0.1. The obvious light curve break observed in GRB 990123 is due to the relativistic-Newtonian transition of the beamed ejecta, and the rapidly fading optical afterglows come from synchrotron emissions during the mildly relativistic and non-relativistic phases. We strongly suggest that the rapid fading of afterglows currently observed in some gamma-ray bursts is evidence for beaming in these cases.
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
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语种英语
WOS记录号WOS:000086869100003
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240273
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
作者单位中国科学院高能物理研究所
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Huang, YF,Dai, ZG,Lu, T. Rapid fading of optical afterglows as evidence for beaming in gamma-ray bursts[J]. ASTRONOMY & ASTROPHYSICS,2000,355(3):L43-L46.
APA Huang, YF,Dai, ZG,&Lu, T.(2000).Rapid fading of optical afterglows as evidence for beaming in gamma-ray bursts.ASTRONOMY & ASTROPHYSICS,355(3),L43-L46.
MLA Huang, YF,et al."Rapid fading of optical afterglows as evidence for beaming in gamma-ray bursts".ASTRONOMY & ASTROPHYSICS 355.3(2000):L43-L46.
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