銀河ガス円盤プラズマの3次元磁気流体数値実験(宇宙・惑星(2),一般講演)

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  • Global 3D MHD Simulations of the galactic gaseous disk

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Loop like molecular structures have been observed in the Galactic center region with NANTEN milli meter telescope (Fukui et al. 2006). They considered that loops are explained in terms of the buoyant rise of magnetic loops due to the Parker instability, because the estimated kinematic energy of loops exceed 1052ergs and they could not _nd any infrared sources. We have carried out global three-dimensional magneto-hydrodynamic simulations of the gas disk in the Galactic center. The gravitational potential is approximated by the axisymmetric potential proposed by Miyamoto & Nagai (1975). In the initial state, we assume a warm (104K) gas torus threaded by azimuthal magnetic fields. Radiative cooling of the gas is ignored. We ignored the self-gravity of the gas. We found that buoyantly rising magnetic loops are formed above the differentially rotating, magnetically turbulent disk. Typical length and height of a loop are 1kpc and 200pc, respectively.

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