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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.
Source PublicationASTROPHYSICAL JOURNAL
2004-11-01
Volume615Issue:1Pages:359-365
DOI10.1086/424378
Contribution Rank第3完成单位
Indexed BySCI
KeywordGamma Rays : Bursts Gamma Rays : Observations Ism : Jets And Outflows Methods : Statistical
AbstractWe 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).
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-637X
URL查看原文
WOS IDWOS:000224760800033
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSTANDARD 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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Cited Times:21[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6968
Collection星系研究组
Corresponding AuthorWu, XF (reprint author), Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China.
Affiliation1.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
Recommended Citation
GB/T 7714
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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