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The Large-scale Magnetic Field of a Thin Accretion Disk with Outflows
Li, Jiawen1,2; Cao, Xinwu2,3,4
2019-02-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume872Issue:2Pages:12
Corresponding AuthorCao, Xinwu(cxw@shao.ac.cn)
AbstractThe large-scale magnetic field threading an accretion disk plays an important role in launching jets/outflows. The field may probably be advected inward by the plasma in the accretion disk from the ambient environment (interstellar medium or a companion star). It has been suggested that the external field can be efficiently dragged inward in a thin disk with magnetic outflows. We construct a self-consistent global disk-outflow model in which the large-scale field is formed by the advection of the external field in the disk. The outflows are accelerated by this field corotating with the disk, which carries away most of the angular momentum of the disk and causes its structure to become significantly different from the conventional viscous disk structure. We find that the magnetic field strength in the inner region of the disk can be several orders of magnitude higher than the external field strength for a geometrically thin disk with H/R similar to 0.1 if the ratio of the gas to magnetic pressure beta(out) similar to 10(2) at the outer edge of the disk. The outflow velocity shows a layer-like structure, i.e., it decreases with radius where it is launched. The outflow can be accelerated up to similar to 0.2-0.3c from the inner region of the disk, and the mass-loss rate in the outflows is similar to 10%-70% of the mass accretion rate at the outer radius of the disk, which may account for the fast outflows that are observed in some active galactic nuclei.
Keywordaccretion, accretion disks galaxies: jets ISM: jets and outflows magnetic fields
DOI10.3847/1538-357/ab0207
WOS KeywordVERTICAL STRUCTURE ; BLACK-HOLES ; EJECTION STRUCTURES ; ANGULAR-MOMENTUM ; COLLAPSING STAR ; PRANDTL NUMBER ; DYNAMO ACTION ; DRIVEN ; TRANSPORT ; WIND
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000459323800002
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/18638
Collection中国科学院紫金山天文台
Corresponding AuthorCao, Xinwu
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
4.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Li, Jiawen,Cao, Xinwu. The Large-scale Magnetic Field of a Thin Accretion Disk with Outflows[J]. ASTROPHYSICAL JOURNAL,2019,872(2):12.
APA Li, Jiawen,&Cao, Xinwu.(2019).The Large-scale Magnetic Field of a Thin Accretion Disk with Outflows.ASTROPHYSICAL JOURNAL,872(2),12.
MLA Li, Jiawen,et al."The Large-scale Magnetic Field of a Thin Accretion Disk with Outflows".ASTROPHYSICAL JOURNAL 872.2(2019):12.
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