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| Paper: |
Two and Three-Dimensional Inhomogeneous Gas Dynamics in the Central Kiloparsec |
| Volume: |
249, The Central Kiloparsec of Starbursts and AGN: the La Palma Connection |
| Page: |
679 |
| Authors: |
Wada, Keiichi |
| Abstract: |
The parsec-scale structure of the interstellar medium (ISM) in the central kpc region is discussed based on our two- and three-dimensional high-resolution hydrodynamical simulations, taking into account realistic cooling and self-gravity of the gas. Two-dimensional simulations of the ISM in a weak bar potential reveal that the resonant structures, such as spirals, actually have fine structure which could be observed with the next generation radio interferometer. The three-dimensional structure of a massive gas disk in the central 100 pc is highly inhomogeneous. Diffuse plumes outside the disk are formed due to supernovae. The density structure of the ISM is characterized by a ``tangled network'', which is a natural consequence of non-linear development of thermal and gravitational instability in a rotating system. The strong non-linearity of the evolution is also proved by the fact that the density PDF is well fitted by a single log--normal function over a wide range. |
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