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Fall back accretion and energy injections in gamma-ray bursts
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
2015-02-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume446Issue:4Pages:3642-3650
AbstractIntense 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.
KeywordRadiation Mechanisms: Non-thermal Ism: Jets And Outflows
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/mnras/stu2336
WOS KeywordDENSITY-JUMP MEDIUM ; LIGHT CURVES ; CENTRAL ENGINE ; COMPACT OBJECTS ; NEUTRON-STAR ; BLACK-HOLES ; MULTIBAND AFTERGLOW ; DYNAMICAL MODEL ; FIREBALL MODEL ; SHOCK-MODELS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000350272400031
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/14892
Collection南极天文中心
Affiliation1.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
Recommended Citation
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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