Kinematics of ionized gas in the spiral galaxy NGC 6946

Details Kinematics of ionized gas in the spiral galaxy NGC 6946 Kinematics of ionized gas in the spiral galaxy NGC 6946

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...189...59b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 189, no. 1-2, Jan. 1988, p. 59-65.

Astronomy and Astrophysics

Astrophysics

26

Astronomical Spectroscopy, Galactic Rotation, Gas Dynamics, Ionized Gases, Radial Velocity, Spiral Galaxies, Astronomical Models, Dark Matter, Galactic Evolution, Hydrogen Ions, Molecular Clouds, Velocity Distribution

Scientific paper

Based on observations made with a scanning Fabry-Perot spectrograph at the 3.6-m Canada-France-Hawaii Telescope, a complete two-dimensional radial velocity field of ionized hydrogen in the late-type spiral NGC 6946 is given. A slight but definite displacement of the kinematical center with respect to the nucleus is found. A strong kinematical disturbance appears in the central part. It is most probably related to the recently discovered massive molecular bar. Radial-velocity gradients across the brightest spiral arm are clearly seen, and behave in a manner consistent with the density wave theory. A large scale radial-velocity asymmetry is also seen. The mean velocity field is used to derive the positions of the resonances and to build a mass model, from which evidence for dark matter is found.

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