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Formation of Magnetic-Tower Jets in Magnetohydrodynamic Accretion Flows
Yoshiaki Kato,Kazunari Shibata,Shin Mineshige 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
We present three-dimensional (3-D) magnetohydrodynamic (MHD) simulations of jets from accretion disks around black holes (BHs). When the bulk of the torus material reaches the innermost region close to a central BH, a magnetically driven jet emerges. This magnetic jet is derived by vertically in ating toroidal elds (\magnetic tower") and has a two-component structure: a magneticpressure- dominated plasma threaded with poloidal elds is surrounded by one with toroidal elds. The collimation width of the jet depends on the external pressure, the pressure of the ambient medium: the weaker the external pressure is, the wider and the longer-lasting becomes the jet. When the external pressure is extremely strong, the formation of the magnetic-tower jet is inhibited. Our simulations indicate that, once a magnetic-tower jet is formed, a global poloidal magnetic eld is created along the rotation axis of the disk. Our model can naturally explain the origin of the global poloidal eld observed in astrophysical jets.