Abstract
We present the results of global 2D and 3D magnetohydrodynamic simulations of jet formation from a gas disk rotating around a central object. In a disk-star system, differential rotation twists magnetic loops connecting a star and its disk. As magnetic twist accumulates, the magnetic loops inflate and form current sheets inside the loops. Magnetic reconnection taking place in the current sheet can be the origin of X-ray flares observed in protostars. Numerical simulations using larger computing area revealed that the expanding magnetic loops form a magnetic tower. Magnetic reconnections taking place near the footpoints of the tower inject hot plasmoids into the tower. Less collimated outflow of cool gas emanates from the disk along the large-scale magnetic fields formed by the magnetic loop expansion. We also show that even when the large-scale poloidal magnetic fields do not exist at the initial state, they are generated by the buoyant rise of magnetic loops from the accretion disk. These magnetic loops are twisted, elongated, and form magnetic towers. Core-jet and outer wind structure is common both in AGNs and in protostars.
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Matsumoto, R. (2009). Similarities of the Launching Mechanism in Protostellar/AGN Jets. In: Tsinganos, K., Ray, T., Stute, M. (eds) Protostellar Jets in Context. Astrophysics and Space Science Proceedings. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00576-3_23
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DOI: https://doi.org/10.1007/978-3-642-00576-3_23
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