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DELAYED ENERGY INJECTION MODEL FOR GAMMA-RAY BURST AFTERGLOWS
Geng, J. J.1,2; Wu, X. F.3,4,5; Huang, Y. F.1,2; Yu, Y. B.1,2
2013-12-10
Source PublicationASTROPHYSICAL JOURNAL
Volume779Issue:1Pages:P8
AbstractThe shallow decay phase and flares in the afterglows of gamma-ray bursts (GRBs) are widely believed to be associated with the later activation of the central engine. Some models of energy injection involve a continuous energy flow since the GRB trigger time, such as the magnetic dipole radiation from a magnetar. However, in the scenario involving a black hole accretion system, the energy flow from the fall-back accretion may be delayed for a fall-back time similar to t(fb). Thus, we propose a delayed energy injection model. The delayed energy would cause a notable rise to the Lorentz factor of the external shock, which will "generate" a bump in the multiple band afterglows. If the delayed time is very short, our model degenerates to the previous models. Our model can explain the significant re-brightening in the optical and infrared light curves of GRB 081029 and GRB 100621A. A considerable fall-back mass is needed to provide the later energy; this indicates that GRBs accompanied with fall-back material may be associated with a low energy supernova so that the fraction of the envelope can survive during eruption. The fall-back time can give meaningful information on the properties of GRB progenitor stars.
KeywordAccretion, Accretion Disks Gamma-ray Burst: Individual (081029, 100621a) Methods: Numerical
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/779/1/28
WOS KeywordRELATIVISTIC WIND BUBBLES ; BLANDFORD-ZNAJEK PROCESS ; LIGHT CURVES ; CENTRAL ENGINE ; BLACK-HOLES ; ACCRETION DISKS ; SWIFT J1644+57 ; FIREBALL MODEL ; OPTICAL FLASH ; DENSITY-JUMP
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000328160100028
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10045
Collection南极天文中心
Affiliation1.Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China
2.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, 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.Nanjing Univ, Chinese Acad Sci, Joint Ctr Particle Nucl Phys & Cosmol, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Geng, J. J.,Wu, X. F.,Huang, Y. F.,et al. DELAYED ENERGY INJECTION MODEL FOR GAMMA-RAY BURST AFTERGLOWS[J]. ASTROPHYSICAL JOURNAL,2013,779(1):P8.
APA Geng, J. J.,Wu, X. F.,Huang, Y. F.,&Yu, Y. B..(2013).DELAYED ENERGY INJECTION MODEL FOR GAMMA-RAY BURST AFTERGLOWS.ASTROPHYSICAL JOURNAL,779(1),P8.
MLA Geng, J. J.,et al."DELAYED ENERGY INJECTION MODEL FOR GAMMA-RAY BURST AFTERGLOWS".ASTROPHYSICAL JOURNAL 779.1(2013):P8.
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