A magnetohydrodynamical model for the formation of episodic jets

	A magnetohydrodynamical model for the formation of episodic jets
	Yuan, F 1; Lin J(林隽)2,3 ; Wu, KW 4; Ho, LC 5
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2009-06-01
卷号	395 期号:4 页码:2183-2188
关键词	accretion black hole physics MHD ISM: jets and outflow accretion discs
ISSN号	0035-8711
通讯作者	Yuan, F (reprint author), Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, JOINGC SHAO & USTC, 80 Nandan Rd, Shanghai 200030, Peoples R China.
产权排序	第二完成单位
英文摘要	Episodic ejection of plasma blobs has been observed in many black hole systems. While steady, continuous jets are believed to be associated with large-scale open magnetic fields, what causes the episodic ejection of blobs remains unclear. Here by analogy with the coronal mass ejection on the Sun, we propose a magnetohydrodynamical model for episodic ejections from black holes associated with the closed magnetic fields in an accretion flow. Shear and turbulence of the accretion flow deform the field and result in the formation of a flux rope in the disc corona. Energy and helicity are accumulated and stored until a threshold is reached. The system then loses its equilibrium and the flux rope is thrust outward by the magnetic compression force in a catastrophic way. Our calculations show that for parameters appropriate for the black hole in our Galactic centre, the plasmoid can attain relativistic speeds in about 35 min.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	MAGNETICALLY DRIVEN ACCRETION ; ADVECTION-DOMINATED ACCRETION ; CORONAL MASS EJECTIONS ; BLACK-HOLES ; SAGITTARIUS-A ; SOLAR ERUPTIONS ; GRS 1915+105 ; DISKS ; FLOWS ; FIELD
收录类别	SCI
原文出处	http://mnras.oxfordjournals.org/content/395/4/2183
语种	英语
WOS记录号	WOS:000266112600034
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6136]
专题	云南天文台_太阳物理研究组
作者单位	1.Joint Institute for Galaxy and Cosmology (JOINGC) of SHAO and USTC, Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, China 2.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China 3.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA 4.Mullard Space Science Laboratory, University College London, Holmbury St Mary, Surrey RH5 6NT 5.The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA
推荐引用方式 GB/T 7714	Yuan, F,Lin J,Wu, KW,et al. A magnetohydrodynamical model for the formation of episodic jets[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2009,395(4):2183-2188.
APA	Yuan, F,Lin J,Wu, KW,&Ho, LC.(2009).A magnetohydrodynamical model for the formation of episodic jets.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,395(4),2183-2188.
MLA	Yuan, F,et al."A magnetohydrodynamical model for the formation of episodic jets".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 395.4(2009):2183-2188.