Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.191..169n&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 191, Apr. 1980, p. 169-184. Research supported by the Science Research
Astronomy and Astrophysics
Astronomy
48
Galactic Structure, Hydrogen Clouds, Interstellar Gas, Radial Velocity, Spiral Galaxies, Astronomical Maps, Galactic Rotation, Hydrogen Atoms, Interstellar Extinction, Neutral Gases, Spatial Distribution, Velocity Distribution
Scientific paper
An aperture synthesis survey of H I in the Scd galaxy IC 342 is described, with a radial velocity resolution 16 km/sec and a maximum angular resolution of 1.9 x 2.0 arcmin. There is large-scale asymmetry, with a low-brightness extension to the northwest reaching 52 kpc from the nucleus. The velocity field shows deviations from normal rotation in the outer parts of the galaxy which are interpreted as warping of the galactic plane. The data are consistent with a flat rotation curve out to at least 42 kpc. If the rotation curve is flat at greater radii, the 'northwest extension' is also warped, but not so strongly as expected from an extrapolation of the perturbations observed at smaller radii. A tidal interaction is an attractive explanation for the disturbances.
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