A COMPREHENSIVE STUDY OF GAMMA-RAY BURST OPTICAL EMISSION. II. AFTERGLOW ONSET AND LATE RE-BRIGHTENING COMPONENTS
文献类型：期刊论文
| 作者 | Liang, En-Wei1,2,3,4; Li, Liang1,2; Gao, He4; Zhang, Bing4; Liang, Yun-Feng1,2 ; Wu, Xue-Feng5; Yi, Shuang-Xi6; Dai, Zi-Gao6; Tang, Qing-Wen1,2; Chen, Jie-Min1,2
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2013-09-01 |
| 卷号 | 774期号:1页码:0 |
| ISSN号 | 0004-637X |
| 关键词 | gamma-ray burst: general radiation mechanisms: non-thermal |
| 通讯作者 | Liang, EW (reprint author), Guangxi Univ, Dept Phys, Nanning 530004, Peoples R China. Email: lew@gxu.edu.cn ; zhang@physics.unlv.edu |
| 英文摘要 | We continue our systematic statistical study of various components of gamma-ray burst (GRB) optical light curves. We decompose the early onset bump and the late re-brightening bump with empirical fits and analyze their statistical properties. Among the 146 GRBs that have well-sampled optical light curves, the onset and re-brightening bumps are observed in 38 and 26 GRBs, respectively. It is found that the typical rising and decaying slopes for both the onset and re-brightening bumps are similar to 1.5 and similar to-1.15, respectively. No early onset bumps in the X-ray band are detected to be associated with the optical onset bumps, while an X-ray re-brightening bump is detected for half of the re-brightening optical bumps. The peak luminosity is anti-correlated with the peak time L-p proportional to t(p)(-1.81 +/- 0.32) for the onset bumps and L-p proportional to t(p)(-0.83 +/- 0.17) for the re-brightening bumps. Both L-p and the isotropic energy release of the onset bumps are correlated with E-gamma,E- iso, whereas no similar correlation is found for the re-brightening bumps. These results suggest that the afterglow onset bumps are likely due to the deceleration of the GRB fireballs. Taking the onset bumps as probes for the properties of the fireballs and their ambient medium, we find that the typical power-law index of the relativistic electrons is 2.5 and the medium density profile behaves as n proportional to r(-1) within the framework of the synchrotron external shock models. With the medium density profile obtained from our analysis, we also confirm the correlation between the initial Lorentz factor (Gamma(0)) and E-iso,E-gamma in our previous work. The jet component that produces the re-brightening bump seems to be on-axis and independent of the prompt emission jet component. Its typical kinetic energy budget would be about one order of magnitude larger than the prompt emission component, but with a lower Gamma(0), typically several tens. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | INITIAL LORENTZ FACTOR ; SWIFT GRB AFTERGLOWS ; HIGH-ENERGY EMISSION ; DENSITY-JUMP MEDIUM ; X-RAY ; LIGHT CURVES ; PROMPT EMISSION ; MILLISECOND PULSARS ; CENTRAL ENGINE ; OFF-AXIS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000323426700013 |
| 公开日期 | 2014-01-08 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/9888]  |
| 专题 | 紫金山天文台_宇宙伽马暴、中子星及相关物理研究团组 |
| 作者单位 | 1.Guangxi Univ, Dept Phys, Nanning 530004, Peoples R China 2.Guangxi Univ, GXU NAOC Ctr Astrophys & Space Sci, Nanning 530004, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 4.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA 5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 6.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China 7.Guangxi Teachers Educ Univ, Coll Phys & Elect Engn, Nanning 530001, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liang, En-Wei,Li, Liang,Gao, He,et al. A COMPREHENSIVE STUDY OF GAMMA-RAY BURST OPTICAL EMISSION. II. AFTERGLOW ONSET AND LATE RE-BRIGHTENING COMPONENTS[J]. ASTROPHYSICAL JOURNAL,2013,774(1):0. |
| APA | Liang, En-Wei.,Li, Liang.,Gao, He.,Zhang, Bing.,Liang, Yun-Feng.,...&Wei, Jian-Yan.(2013).A COMPREHENSIVE STUDY OF GAMMA-RAY BURST OPTICAL EMISSION. II. AFTERGLOW ONSET AND LATE RE-BRIGHTENING COMPONENTS.ASTROPHYSICAL JOURNAL,774(1),0. |
| MLA | Liang, En-Wei,et al."A COMPREHENSIVE STUDY OF GAMMA-RAY BURST OPTICAL EMISSION. II. AFTERGLOW ONSET AND LATE RE-BRIGHTENING COMPONENTS".ASTROPHYSICAL JOURNAL 774.1(2013):0. |
入库方式： OAI收割
来源：紫金山天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。