| 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.
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| 发表期刊 | ASTROPHYSICAL JOURNAL
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| 2004-11-01 | |
| 卷号 | 615期号:1页码:359-365 |
| DOI | 10.1086/424378 |
| 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 |
| ISSN | 0004-637X |
| URL | 查看原文 |
| 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 |
| 引用统计 | |
| 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 |
| 推荐引用方式 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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| Jet Break Time-Flux （312KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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