EPISODIC JET POWER EXTRACTED FROM A SPINNING BLACK HOLE SURROUNDED BY A NEUTRINO-DOMINATED ACCRETION FLOW IN GAMMA-RAY BURSTS

	EPISODIC JET POWER EXTRACTED FROM A SPINNING BLACK HOLE SURROUNDED BY A NEUTRINO-DOMINATED ACCRETION FLOW IN GAMMA-RAY BURSTS
	Cao, Xinwu1,2,3 ; Liang, En-Wei 4,5; Yuan, Ye-Fei 6
刊名	ASTROPHYSICAL JOURNAL
	2014-07-10
卷号	789 期号:2 页码:129-129
关键词	accretion black hole physics gamma-ray burst: general accretion disks
通讯作者	曹新伍
英文摘要	It was suggested that the relativistic jets in gamma-ray bursts (GRBs) are powered via the Blandford-Znajek (BZ) mechanism or the annihilation of neutrinos and anti-neutrinos from a neutrino cooling-dominated accretion flow (NDAF). The advection and diffusion of the large-scale magnetic field of an NDAF is calculated, and the external magnetic field is found to be dragged inward efficiently by the accretion flow for a typical magnetic Prandtl number P-m = eta/nu similar to 1. The maximal BZ jet power can be similar to 10(53)-10(54) erg s(-1) for an extreme Kerr black hole, if an external magnetic field with 10(14) Gauss is advected by the NDAF. This is roughly consistent with the field strength of the disk formed after a tidal disrupted magnetar. The accretion flow near the black hole horizon is arrested by the magnetic field if the accretion rate is below than a critical value for a given external field. The arrested accretion flow fails to drag the field inward and the field strength decays, and then the accretion re-starts, which leads to oscillating accretion. The typical timescale of such episodic accretion is of an order of one second. This can qualitatively explain the observed oscillation in the soft extended emission of short-type GRBs.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	MAGNETIC PRANDTL NUMBER ; VERTICAL STRUCTURE ; ELECTROMAGNETIC EXTRACTION ; DIFFUSION-COEFFICIENTS ; CENTRAL ENGINE ; GRB 080916C ; DISKS ; TRANSPORT ; MODELS ; ENERGY
收录类别	SCI
语种	英语
WOS记录号	WOS:000338674900038
公开日期	2015-02-14
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/15706]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 2.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China 3.Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Fujian, Peoples R China 4.Guangxi Univ, Dept Phys, Nanning 530004, Peoples R China 5.Guangxi Univ, GXU NAOC Ctr Astrophys & Space Sci, Nanning 530004, Peoples R China 6.Univ Sci & Technol China, Dept Astron, Hefei 230026, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Cao, Xinwu,Liang, En-Wei,Yuan, Ye-Fei. EPISODIC JET POWER EXTRACTED FROM A SPINNING BLACK HOLE SURROUNDED BY A NEUTRINO-DOMINATED ACCRETION FLOW IN GAMMA-RAY BURSTS[J]. ASTROPHYSICAL JOURNAL,2014,789(2):129-129.
APA	Cao, Xinwu,Liang, En-Wei,&Yuan, Ye-Fei.(2014).EPISODIC JET POWER EXTRACTED FROM A SPINNING BLACK HOLE SURROUNDED BY A NEUTRINO-DOMINATED ACCRETION FLOW IN GAMMA-RAY BURSTS.ASTROPHYSICAL JOURNAL,789(2),129-129.
MLA	Cao, Xinwu,et al."EPISODIC JET POWER EXTRACTED FROM A SPINNING BLACK HOLE SURROUNDED BY A NEUTRINO-DOMINATED ACCRETION FLOW IN GAMMA-RAY BURSTS".ASTROPHYSICAL JOURNAL 789.2(2014):129-129.