Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-25
Mon.Not.Roy.Astron.Soc. 329 (2002) 502
Astronomy and Astrophysics
Astrophysics
Accepted for publication in MNRAS, 12 pages, 5 figures. Because of space limitations, Fig.5 has low resolution in the paper. F
Scientific paper
10.1046/j.1365-8711.2002.04957.x
We report here results of high-resolution hydrodynamical simulations of gas flows in barred galaxies, with a focus on gas dynamics in the central kiloparsec. In a single bar with an Inner Lindblad Resonance, we find either near-circular motion of gas in the nuclear ring, or a spiral shock extending towards the galaxy center, depending on the sound speed in the gas. From a simple model of a dynamically-possible doubly barred galaxy with resonant coupling, we infer that the secondary bar is likely to end well inside its corotation. Such a bar cannot create shocks in the gas flow, and therefore will not reveal itself in color maps through straight dust lanes: the gas flows induced by it are different from those caused by the rapidly rotating main bars. In particular, we find that secondary stellar bars are unlikely to increase the mass inflow rate into the galactic nucleus.
Maciejewski Witold
Sparke Linda S.
Stone James M.
Teuben Peter J.
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