| A comprehensive analysis of Swift XRT data. III. Jet break candidates in x-ray and optical afterglow light curves | |
Liang, En-Wei1,2; Racusin, Judith L.3; Zhang, Bing1; Zhang BB(张彬彬)1,4 ; Burrows, David N.3; Liang, EW (reprint author), Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA.
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| 发表期刊 | ASTROPHYSICAL JOURNAL
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| 2008-03 | |
| 卷号 | 675期号:1页码:528-552 |
| DOI | 10.1086/524701 |
| 产权排序 | 第4完成单位 |
| 收录类别 | SCI |
| 关键词 | Gamma Rays : Bursts Radiation Mechanisms : Nonthermal X-rays |
| 摘要 | The Swift XRT data for 179 GRBs (050124 to 070129) and the optical afterglow data for 57 pre- and post-Swift GRBs are analyzed to explore whether the observed breaks in the afterglow light curves can be interpreted as jet breaks, as well as their implications for jet energetics. We find that no burst is included in our "Platinum" sample, in which the data fully satisfy the jet break criteria. By relaxing one or more of the requirements for a jet break, candidates to various degrees are identified. In the X-ray band, 42 of 103 well-sampled X-ray light curves have a decay slope greater than or similar to 1.5 in the postbreak segment (the "Bronze" sample), and 27 of these also satisfy the closure relations of the forward-shock models ("Silver" sample). The numbers of "Bronze" and "Silver" candidates in the optical light curves are 27 and 23, respectively. The X-ray break time is earlier than that in the optical bands. Among 13 bursts having both optical and X-ray light curves, only seven have an achromatic break, and even in these cases, only in one band do the data satisfy the closure relations ("Gold" sample). These results raise concerns about interpreting the breaks as jet breaks and further inferring GRB energetics. Assuming that the "Silver" and "Gold" breaks are jet breaks, we derive jet opening angles (theta(j)) and kinetic energies (E(K)) or lower limits on them and find that the EK distribution is much more scattered than the pre-Swift sample, but a tentative anticorrelation between theta(j) and E(K,iso) is found, indicating that the E(K) could still be quasi-universal. |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Review |
| ISSN | 0004-637X |
| URL | 查看原文 |
| WOS记录号 | WOS:000253562000041 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | BURST AFTERGLOWS ; THEORETICAL IMPLICATIONS ; PHYSICAL PARAMETERS ; ACHROMATIC BREAKS ; RELATIVISTIC JETS ; ENERGY INJECTION ; FIREBALL MODEL ; HOST GALAXY ; GRB 970508 ; 1ST SURVEY |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/9366 |
| 专题 | 星系研究组 |
| 通讯作者 | Liang, EW (reprint author), Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA. |
| 作者单位 | 1.Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154 2.Department of Physics, Guangxi University, Nanning, 530004 Guanxgi, China 3.Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 4.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, 650011 Kunming, China |
| 推荐引用方式 GB/T 7714 | Liang, En-Wei,Racusin, Judith L.,Zhang, Bing,et al. A comprehensive analysis of Swift XRT data. III. Jet break candidates in x-ray and optical afterglow light curves[J]. ASTROPHYSICAL JOURNAL,2008,675(1):528-552. |
| APA | Liang, En-Wei,Racusin, Judith L.,Zhang, Bing,张彬彬,Burrows, David N.,&Liang, EW .(2008).A comprehensive analysis of Swift XRT data. III. Jet break candidates in x-ray and optical afterglow light curves.ASTROPHYSICAL JOURNAL,675(1),528-552. |
| MLA | Liang, En-Wei,et al."A comprehensive analysis of Swift XRT data. III. Jet break candidates in x-ray and optical afterglow light curves".ASTROPHYSICAL JOURNAL 675.1(2008):528-552. |
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