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Jet break time-flux density relationship and constraints on physical parameters of gamma-ray burst afterglows
Wu, XF1; Dai, ZG1; Liang EW(梁恩维)1,2,3; Wu, XF (reprint author), Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2004-11-01
卷号615期号:1页码:359-365
DOI10.1086/424378
产权排序第3完成单位
收录类别SCI
关键词Gamma Rays : Bursts Gamma Rays : Observations Ism : Jets And Outflows Methods : Statistical
摘要We derive a relation between the flux density F(nu,j) at the light-curve break of a gamma-ray burst (GRB) afterglow and the break time t(j). The break is due to the transition from the spherical-like to jet-like evolution of the afterglow, when the Lorentz factor of the jet equals the inverse of the initial half-opening angle, i.e., gamma=1=theta(0). We show that this relation indeed behaves as F(nu,j) proportional to t(j)(-p) among GRBs for the slow-cooling case, where p is the power-law index of electron distribution. A statistical analysis of the optical jet breaks of nine GRBs gives p=2.10+/-0.21, which is consistent with the shock acceleration theory. The value of p derived in this way is different from the observed temporal index alpha(2) (F(nu) proportional to t(-alpha 2)) of the late-time light curve after t(j), which suffers several uncertainties from the unclear hydrodynamics of the sideways expansion and exhibits a large dispersion. Our results not only confirm that the remnants of GRBs are standard candles, but also provide the first evidence that the physical parameters of relativistic shocks are universal, with the favored values epsilon(e)similar to0.1 and epsilon(B)similar to10(-3).
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
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WOS记录号WOS:000224760800033
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]STANDARD ENERGY RESERVOIR ; BRIGHT OPTICAL AFTERGLOW ; RELATIVISTIC BLAST WAVES ; LIGHT CURVES ; GRB 000301C ; HOST GALAXY ; MAGNETIC-FIELDS ; VIEWING ANGLE ; JUMP MEDIUM ; WIND
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6968
专题星系研究组
通讯作者Wu, XF (reprint author), Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China.
作者单位1.Department of Astronomy, Nanjing University, Nanjing 210093, China
2.Department of Physics, Guangxi University, Nanning 530004, China
3.National Astronomical Observatories, Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
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Wu, XF,Dai, ZG,Liang EW,et al. Jet break time-flux density relationship and constraints on physical parameters of gamma-ray burst afterglows[J]. ASTROPHYSICAL JOURNAL,2004,615(1):359-365.
APA Wu, XF,Dai, ZG,Liang EW,&Wu, XF .(2004).Jet break time-flux density relationship and constraints on physical parameters of gamma-ray burst afterglows.ASTROPHYSICAL JOURNAL,615(1),359-365.
MLA Wu, XF,et al."Jet break time-flux density relationship and constraints on physical parameters of gamma-ray burst afterglows".ASTROPHYSICAL JOURNAL 615.1(2004):359-365.
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