H I rotation curves of spiral galaxies. I - NGC 3198

Details H I rotation curves of spiral galaxies. I - NGC 3198 H I rotation curves of spiral galaxies. I - NGC 3198

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...223...47b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 223, no. 1-2, Oct. 1989, p. 47-60. Research supported by ZWO and ASTRON.

Astronomy and Astrophysics

Astrophysics

268

Galactic Rotation, H I Regions, Spiral Galaxies, Density Distribution, Hydrogen, Line Spectra, Optical Properties, Radio Telescopes, Velocity Distribution

Scientific paper

Observations of the spiral galaxy NGC 3198 in the 21-cm line are presented. The H I distribution extends to about two Holmberg radii and the radial velocity field is symmetric and regular over the entire area. A new method for the derivation of rotation curves is described. Results obtained show that the rotation curve of NGC 3198 is flat to within 5 km/s out to the last measured point at 11 disk scale lengths. This implies a large discrepancy between the observed rotation curve and that predicted from the light distribution.

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