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Analytical Solution of Magnetically Dominated Astrophysical Jets and Winds: Jet Launching, Acceleration, and Collimation
Chen, Liang1; Zhang, Bing2
2021
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume906Issue:2Pages:34
AbstractWe present an analytical solution of a highly magnetized jet/wind flow. The left side of the general force-free jet/wind equation (the "pulsar" equation) is separated into a rotating and a nonrotating term. The two equations with either term can be solved analytically, and the two solutions match each other very well. Therefore, we obtain a general approximate solution of a magnetically dominated jet/wind, which covers from the nonrelativistic to relativistic regimes, with the drift velocity well matching the cold plasma velocity. The acceleration of a jet includes three stages. (1) The jet flow is located within the Alfven critical surface (i.e., the light cylinder), has a nonrelativistic speed, and is dominated by toroidal motion. (2) The jet is beyond the Alfven critical surface where the flow is dominated by poloidal motion and becomes relativistic. The total velocity in these two stages follows the same law v Gamma = omega R. (3) The evolution law is replaced by v Gamma approximate to 1 (theta root 2 - nu), where is the half-opening angle of the jet and 0 <= nu <= 2 is a free parameter determined by the magnetic field configuration. This is because the earlier efficient acceleration finally breaks the causality connection between different parts in the jet, preventing a global solution. The jet has to carry local charges and currents to support an electromagnetic balance. This approximate solution is consistent with known theoretical results and numerical simulations, and it is more convenient to directly compare with observations. This theory may be used to constrain the spin of black holes in astrophysical jets.
KeywordRelativistic jets Gamma-ray bursts Radio active galactic nuclei Active galactic nuclei Magnetic fields Astrophysical black holes Charged black holes Gamma-rays Cosmic rays Pulsars Neutron stars High energy astrophysics
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
DOI10.3847/1538-4357/abc42d
WOS KeywordACTIVE GALACTIC NUCLEI ; RELATIVISTIC MAGNETOHYDRODYNAMIC SIMULATIONS ; BLACK-HOLE ELECTRODYNAMICS ; FORCE-FREE MAGNETOSPHERE ; RAY BURST OUTFLOWS ; ACCRETION DISKS ; INNER JET ; OBSERVATIONAL EVIDENCE ; HYDROMAGNETIC FLOWS ; KINETIC-ENERGY
Language英语
Funding ProjectNational Natural Science Foundation of China[U1831138]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000607463900001
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/79938
Collection中国科学院国家天文台
Corresponding AuthorChen, Liang
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
Recommended Citation
GB/T 7714
Chen, Liang,Zhang, Bing. Analytical Solution of Magnetically Dominated Astrophysical Jets and Winds: Jet Launching, Acceleration, and Collimation[J]. ASTROPHYSICAL JOURNAL,2021,906(2):34.
APA Chen, Liang,&Zhang, Bing.(2021).Analytical Solution of Magnetically Dominated Astrophysical Jets and Winds: Jet Launching, Acceleration, and Collimation.ASTROPHYSICAL JOURNAL,906(2),34.
MLA Chen, Liang,et al."Analytical Solution of Magnetically Dominated Astrophysical Jets and Winds: Jet Launching, Acceleration, and Collimation".ASTROPHYSICAL JOURNAL 906.2(2021):34.
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