Other
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.191..615n&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 191, May 1980, p. 615-630. Research supported by the Science Research C
Other
37
Astronomical Maps, Galactic Structure, Hydrogen Atoms, Interstellar Gas, Spiral Galaxies, Density Wave Model, Galactic Nuclei, Galactic Rotation, Radial Velocity, Spectral Resolution, Spectroscopic Telescopes, Synthetic Apertures, Velocity Distribution
Scientific paper
A study of H I in the Scd galaxy IC342 with a resolution in radial velocity of 16 km/s and with an angular resolution sufficient to resolve detailed spiral structure is presented. Spiral arms extend over the outer, warped parts of the disk, and reach the limit of detected H I at about 40 arcmin from the nucleus. The pattern is multiarmed, with the clearest features lying beyond the observed optical emission, and inner arms which are well correlated with other population material. A marginal detection of radial streaming motions above 5 km/s along one arm is consistent with the results presented and with the conclusion derived from the H I distribution that corotation is between 16 and 21 kpc from the nucleus, and the pattern speed is approximately 10 km/s/kpc.
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