EARLY AFTERGLOWS OF GAMMA-RAY BURSTS IN A STRATIFIED MEDIUM WITH A POWER-LAW DENSITY DISTRIBUTION
文献类型：期刊论文
| 作者 | Yi, Shuang-Xi1,2; Wu, Xue-Feng3,4,5 ; Dai, Zi-Gao1,2
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2013-10-20 |
| 卷号 | 776期号:2页码:120-120 |
| ISSN号 | 0004-637X |
| 关键词 | gamma-ray burst: general radiation mechanisms: non-thermal |
| 通讯作者 | Yi, Shuang-Xi (通讯作者),Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China |
| 英文摘要 | A long-duration gamma-ray burst (GRB) has been widely thought to arise from the collapse of a massive star, and it has been suggested that its ambient medium is a homogenous interstellar medium (ISM) or a stellar wind. There are two shocks when an ultra-relativistic fireball that has been ejected during the prompt gamma-ray emission phase sweeps up the circumburst medium: a reverse shock that propagates into the fireball, and a forward shock that propagates into the ambient medium. In this paper, we investigate the temporal evolution of the dynamics and emission of these two shocks in an environment with a general density distribution of n proportional to R-k (where R is the radius) by considering thick-shell and thin-shell cases. A GRB afterglow with one smooth onset peak at early times is understood to result from such external shocks. Thus, we can determine the medium density distribution by fitting the onset peak appearing in the light curve of an early optical afterglow. We apply our model to 19 GRBs and find that their k values are in the range of 0.4-1.4, with a typical value of k similar to 1, implying that this environment is neither a homogenous ISM with k = 0 nor a typical stellar wind with k = 2. This shows that the progenitors of these GRBs might have undergone a new mass-loss evolution. |
| 学科主题 | Physical, Chemical & Earth Sciences (PCES) |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | EARLY OPTICAL AFTERGLOWS ; WIND INTERACTION-MODELS ; INITIAL LORENTZ FACTOR ; SWIFT XRT DATA ; X-RAY ; LIGHT CURVES ; ENERGY INJECTION ; MILLISECOND PULSARS ; CENTRAL ENGINE ; RADIO FLARES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000327216100057 |
| 公开日期 | 2014-01-08 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/9923]  |
| 专题 | 紫金山天文台_南极天文中心 |
| 作者单位 | 1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China 2.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China 3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 4.Chinese Acad Sci, Chinese Ctr Antarctic Astron, Nanjing 210008, Jiangsu, Peoples R China 5.Chinese Acad Sci, Joint Ctr Particle Nucl Phys & Cosmol Purple Mt O, Nanjing 210008, Jiangsu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yi, Shuang-Xi,Wu, Xue-Feng,Dai, Zi-Gao. EARLY AFTERGLOWS OF GAMMA-RAY BURSTS IN A STRATIFIED MEDIUM WITH A POWER-LAW DENSITY DISTRIBUTION[J]. ASTROPHYSICAL JOURNAL,2013,776(2):120-120. |
| APA | Yi, Shuang-Xi,Wu, Xue-Feng,&Dai, Zi-Gao.(2013).EARLY AFTERGLOWS OF GAMMA-RAY BURSTS IN A STRATIFIED MEDIUM WITH A POWER-LAW DENSITY DISTRIBUTION.ASTROPHYSICAL JOURNAL,776(2),120-120. |
| MLA | Yi, Shuang-Xi,et al."EARLY AFTERGLOWS OF GAMMA-RAY BURSTS IN A STRATIFIED MEDIUM WITH A POWER-LAW DENSITY DISTRIBUTION".ASTROPHYSICAL JOURNAL 776.2(2013):120-120. |
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来源：紫金山天文台
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