Magnetic Pressure-Driven Jets from a Torus
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概要
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We examine steady, wind-type magnetohydrodynamical (MHD) jets accelerated in a funnel formed along the rotational axis of a geometrically thick torus around a central object, incorporating the effects of mass andtoroidal magnetic field injections from the torus. When the mass and magnetic field are injected from only the base of the jets (without injection from the funnel wall), the magnetic pressure of the toroidal magnetic fields accelerates the gas, whereas the magnetic tension decelerates it as long as the cross-sectional area of the jets increases. In the present case, the locations of the trans-magnetosonic points of jet flow are determined by the thermal properties of the flow and are independent of the magnetic properties. Trans-magnetosonic points shift to infinity in the cold limit, similar to the case of a spherical approximation, although this is not the general case. The terminal speed, v_infty, of MHD jets in the funnel becomes the order of [Phi^2/(4 pi dot{M}]^{1/3}, where dot{M} is the mass flux and Phi is the transfer rate of the toroidal magnetic flux. When the mass and magnetic field injections from the funnel wall are taken into account, trans-magnetosonic points are located at larger distances than the scale length of mass injection. We found that the injection of magnetic fields from the funnel wall enchances the accelaration of jets. In this case, v_infty is the order of [Phi^2_infty/(4pi dot{M}_infty)]^{1/3}, where the mass flux and the magnetic flux are those at infinity.
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