D315 Formation of Magnetic-Tower Jets in Accretion Disks around Black Holes
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概要
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We studied accretion flows and outflows around black holes (BHs) by means of three-dimensional global magnetohydrodynamic (MHD) simulations. General relaticistic effects are simulated by using the pseudo-Newtonian potential. We started the calculations with a rotating torus permeated by localized poloidal magnetic fields with plasma-β, a ratio of the gas pressure to the magnetic pressure, β=10 and 100. We found that a magnetically driven jet emerges from the innermost region of the dynamo-active accretion disks close to the BHs. This MHD jet is generated by vertically inflating toroidal fields (so-called a magnetic-tower jet). The maximum velocity of the jet is about 30% of the speed of light. The magnetic-tower jet collimates at the radius where the magnetic pressure of the tower is balanced with the external pressure.
- 日本流体力学会の論文
- 2004-08-09
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- D315 Formation of Magnetic-Tower Jets in Accretion Disks around Black Holes