Fall back accretion and energy injections in gamma-ray bursts
文献类型：期刊论文
| 作者 | Yu, Y. B.1,2; Wu, X. F.3,4,5; Huang, Y. F.1,6; Coward, D. M.2; Stratta, G.7; Gendre, B.8; Howell, E. J.2 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2015-02-01 |
| 卷号 | 446期号:4页码:3642-3650 |
| 关键词 | radiation mechanisms: non-thermal ISM: jets and outflows |
| 英文摘要 | Intense flares that occur at late times relative to the prompt phase have been observed by the Swift satellite in the X-ray afterglows of gamma-ray bursts (GRBs). Here, we present a detailed analysis on the fall back accretion process to explain the intense flare phase in the very early X-ray afterglow light curves. To reproduce the afterglow at late times, we resort to the external shock by engaging energy injections. By applying our model to GRBs 080810, 081028 and 091029, we show that their X-ray afterglow light curves can be reproduced well. We then apply our model to the ultralong Swift GRB 111209A, which is the longest burst ever observed. The very early X-ray afterglow of GRB 111209A showed many interesting features, such as a significant bump observed at around 2000 s after the Swift/BAT trigger. We assume two constant energy injection processes in our model. These can explain the observed plateau at X-ray wavelength in the relatively early stage (8.0 x 10(3) s) and a second X-ray plateau and optical rebrightening at about 10(5) s. Our analysis supports the scenario that a significant amount of material may fall back towards the central engine after the prompt phase, causing an enhanced and long-lived mass accretion rate powering a Poynting-flux-dominated outflow. |
| 学科主题 | 天文和天体物理 |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DENSITY-JUMP MEDIUM ; LIGHT CURVES ; CENTRAL ENGINE ; COMPACT OBJECTS ; NEUTRON-STAR ; BLACK-HOLES ; MULTIBAND AFTERGLOW ; DYNAMICAL MODEL ; FIREBALL MODEL ; SHOCK-MODELS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000350272400031 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/14892]  |
| 专题 | 紫金山天文台_南极天文中心 |
| 作者单位 | 1.Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China 2.Univ Western Australia, Sch Phys, Crawley, WA 6009, Australia 3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 4.Chinese Acad Sci, Joint Ctr Particle Nucl Phys & Cosmol Purple Mt O, Nanjing 210008, Peoples R China 5.Chinese Acad Sci, Chinese Ctr Antarctic Astron, Nanjing 210008, Peoples R China 6.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China 7.Univ Urbino Carlo Bo, Dipartimento Sci Base & Fondamenti, I-61029 Urbino, Italy 8.Observ Cote Azur, ARTEMIS, F-06304 Nice 4, France |
| 推荐引用方式 GB/T 7714 | Yu, Y. B.,Wu, X. F.,Huang, Y. F.,et al. Fall back accretion and energy injections in gamma-ray bursts[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,446(4):3642-3650. |
| APA | Yu, Y. B..,Wu, X. F..,Huang, Y. F..,Coward, D. M..,Stratta, G..,...&Howell, E. J..(2015).Fall back accretion and energy injections in gamma-ray bursts.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,446(4),3642-3650. |
| MLA | Yu, Y. B.,et al."Fall back accretion and energy injections in gamma-ray bursts".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 446.4(2015):3642-3650. |
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来源：紫金山天文台
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