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题名: Fall back accretion and energy injections in gamma-ray bursts
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
学科分类: 天文和天体物理
DOI: 10.1093/mnras/stu2336
文章类型: Article
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.
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
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000350272400031
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14892
Appears in Collections:南极天文中心_期刊论文

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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
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