A& A Supplement series, Vol. 121, January 1997, 1 - 9
Received November 7; accepted April 9, 1996
O.K. Sil'chenko 
- A.V. Zasov 
- A.N. Burenkov 
- J. Boulesteix 
Send offprint request: O.K. Sil'chenko
Sternberg Astronomical Institute, University av. 13,
Moscow 119899, Russia
Special Astrophysical Observatory, Nizhnij Arkhyz, Karachaj-Cherkess
Republic, 357147 Russia
Observatoire de Marseille, 2 Place Le Verrier,
F-13248 Marseille Cedex 04, France
The Sc galaxy NGC 6181 was observed at the 6m telescope of SAO RAS
with the scanning Perot-Fabry interferometer in the H
emission line and at the 1m telescope of SAO RAS in BVRI broadband filters
with CCD. Subtraction of the mean circular rotation curve from the
two-dimensional velocity field has revealed a ring-like zone with a
diameter about of 2 kpc where strong radial gas motions are present.
The form of the ring is almost perfectly circular in the plane of the
galaxy. It is located closer to the center than the beginning of the
well-defined spiral structure, but outside of the central bulge-dominated
region. The detected radial velocity reduced to the plane of the
galaxy is about 
and probably is azimuthally
dependent. The very inner region of the galaxy, 
or 0.5
kpc, shows a turn of the dynamical major axis by about 
. Central
continuum isophotes are also twisted which suggests the
presence of small nuclear bar.
keywords: galaxies: spirals, kinematics -- scanning Perot-Fabry interferometry