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The power of the jets accelerated by the coronal magnetic field
Cao, Xinwu1,2,3
2018
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume473Issue:3Pages:4268-4271
Corresponding AuthorCao, Xinwu(cxw@shao.ac.cn)
AbstractIt was suggested that the large-scale magnetic field can be dragged inwards efficiently by the corona above the disc, i.e. the so-called 'coronal mechanism', which provides a way to solve the difficulty of field advection in a geometrically thin accretion disc. In this case, themagnetic pressure should be lower than the gas pressure in the corona. We estimate the maximal power of the jets accelerated by the magnetic field advected by the corona. The Blandford-Payne (BP) jet power is found always to be higher than the Blandford-Znajek (BZ) jet power, except for a rapidly spinning black hole with a greater than or similar to 0.8. The maximal jet power is always low, less than 0.05 Eddington luminosity, even for an extreme Kerr black hole, which is insufficient for the observed strong jets in some blazars with jet power similar to 0.1-1 Eddington luminosity (or even higher). It implies that these powerful jets cannot be accelerated by the coronal field. We suggest that, the magnetic field dragged inward by the accretion disc with magnetically outflows may accelerate the jets (at least for the most powerful jets, if not all) in the blazars.
Keywordaccretion accretion discs black hole physics magnetic fields galaxies: jets quasars: general
DOI10.1093/mnras/stx2688
WOS KeywordADVECTION-DOMINATED ACCRETION ; ACTIVE GALACTIC NUCLEI ; KERR BLACK-HOLES ; X-RAY-SPECTRA ; ELECTROMAGNETIC EXTRACTION ; DIFFUSION-COEFFICIENTS ; VERTICAL STRUCTURE ; COLLAPSING STAR ; PRANDTL NUMBER ; POLOIDAL FLUX
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000423809400103
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22260
Collection中国科学院紫金山天文台
Corresponding AuthorCao, Xinwu
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Cao, Xinwu. The power of the jets accelerated by the coronal magnetic field[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,473(3):4268-4271.
APA Cao, Xinwu.(2018).The power of the jets accelerated by the coronal magnetic field.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,473(3),4268-4271.
MLA Cao, Xinwu."The power of the jets accelerated by the coronal magnetic field".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473.3(2018):4268-4271.
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