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| Paper: |
Three-Dimensional Global MHD Simulations of the Magnetic Loop
Structures in our Galactic Center |
| Volume: |
439, The Galactic Center: a Window to the Nuclear Environment of Disk Galaxies |
| Page: |
65 |
| Authors: |
Machida, M.; Matsumoto, R.; Nozawa, S.; Takahashi, K.; Torii, K.; Kudo, N.; Fukui, Y. |
| Abstract: |
Loop-like molecular structures have been observed in the Galactic
center region with the NANTEN millimeter 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 1052 ergs
and they could not find 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 1 kpc and 200 pc, respectively. |
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