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Up: A ring-like zone

5. Concluding remarks

Measurements of the line-of-sight velocity field for gas emission in the giant Sc galaxy NGC 6181 have allowed us to reveal some rare phenomena. The most unusual of them is the presence of a ring-like region with striking systemic deviations from the general circular rotation which may be interpreted as a strong gas radial motion. More elaborate interpretation which connects this motion with the presence of hydrodynamical 3D oscillations of gas velocities related to density wave phenomena will be given elsewhere (Fridman et al., in preparation). A small nuclear bar is also found in the galaxy both by kinematic and photometric methods.


We are very grateful to the observers of the Special Astrophysical Observatory RAS - S.N. Dodonov, S.V. Drabek, and V.V. Vlasiuk assisting us at the 6 m telescope, and V.O. Chavushyan and S.K. Balayan which obtained the data at the 1 m telescope. During the data analysis we have used the Lyon-Meudon Extragalactic Database (LEDA) supplied by the LEDA team at the CRAL-Observatoire de Lyon (France) and of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. We acknowledge also an anonymous referee for the very useful comments and advices.

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