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题名: DELAYED ENERGY INJECTION MODEL FOR GAMMA-RAY BURST AFTERGLOWS
作者: Geng, J. J.1, 2; Wu, X. F.3, 4, 5; Huang, Y. F.1, 2; Yu, Y. B.1, 2
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2013-12-10
卷号: 779, 期号:1, 页码:P8
关键词: accretion, accretion disks ; gamma-ray burst: individual (081029, 100621A) ; methods: numerical
DOI: 10.1088/0004-637X/779/1/28
文章类型: Article
英文摘要: The 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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: RELATIVISTIC WIND BUBBLES ; BLANDFORD-ZNAJEK PROCESS ; LIGHT CURVES ; CENTRAL ENGINE ; BLACK-HOLES ; ACCRETION DISKS ; SWIFT J1644+57 ; FIREBALL MODEL ; OPTICAL FLASH ; DENSITY-JUMP
收录类别: SCI
语种: 英语
WOS记录号: WOS:000328160100028
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/10045
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.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:
Jin Jun Geng, Xue-Feng Wu, Yong-Feng Huang, Yong-Bo Yu. Delayed Energy Injection Model For Gamma-Ray Burst Afterglows[J]. ASTROPHYSICAL JOURNAL,2013,779(1):P8.
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文件名: DELAYED ENERGY INJECTION MODEL FOR GAMMA-RAY BURST AFTERGLOWS.pdf
格式: Adobe PDF
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