DELAYED ENERGY INJECTION MODEL FOR GAMMA-RAY BURST AFTERGLOWS

	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
刊名	ASTROPHYSICAL JOURNAL
	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
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
公开日期	2014-01-20
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/10045]
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.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
推荐引用方式 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.