On the optical light curves of afterglows from jetted gamma-ray burst ejecta: effects of parameters
Huang, YF; Dai, ZG; Lu, T
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2000
卷号316期号:4页码:943-949
关键词radiation mechanisms : non-thermal stars : neutron ISM : jets and outflows gamma-rays : bursts
学科分类Astronomy & Astrophysics
DOI10.1046/j.1365-8711.2000.03683.x
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, Inst High Energy Phys, LCRHEA, Beijing 100039, Peoples R China
文章类型Article
英文摘要Owing to some refinements in the dynamics, we can follow the overall evolution of a realistic jet numerically until its bulk velocity is as small as beta c similar to 10(-3)c. We find no obvious break in the optical light curve during the relativistic phase itself. However, an obvious break does exist at the transition from the relativistic phase to the non-relativistic phase, which typically occurs at time t similar to 10(6)-10(6.5) s (i.e. 10-30 d). The break is affected by many parameters, such as the electron energy fraction xi(e), the magnetic energy fraction xi(B)(2), the initial half-opening angle theta(0) and the medium number density n. Increasing any of them to a large enough value will make the break disappear. Although the break itself is parameter-dependent, afterglows from jetted GRB remnants are uniformly characterized by a quick decay during the non-relativistic phase, with power-law timing index alpha greater than or equal to 2.1. This is quite different from that of isotropic fireballs, and may be of fundamental importance for determining the degree of beaming in gamma-ray bursts observationally.
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:000089102700023
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被引频次:66[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/238779
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. On the optical light curves of afterglows from jetted gamma-ray burst ejecta: effects of parameters[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2000,316(4):943-949.
APA Huang, YF,Dai, ZG,&Lu, T.(2000).On the optical light curves of afterglows from jetted gamma-ray burst ejecta: effects of parameters.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,316(4),943-949.
MLA Huang, YF,et al."On the optical light curves of afterglows from jetted gamma-ray burst ejecta: effects of parameters".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 316.4(2000):943-949.
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