Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...234...43c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 234, no. 1-2, Aug. 1990, p. 43-52. Research supported by NSERC and Ministere d
Astronomy and Astrophysics
Astrophysics
89
Galactic Structure, H I Regions, Mass Distribution, Spiral Galaxies, Galactic Rotation, Halos, Radio Galaxies, Spatial Distribution, Very Large Array (Vla)
Scientific paper
A study of the kinematics and mass distribution of NGC 6946 is presented from Westerbork H I line observations. It is found that the H I distribution is not symmetric but is more extended on the NE side compared to the SW side by about 25 percent in radius. The overall velocity field is fairly regular, with some signs of noncircular motions associated with the optical and H I spiral arms. A well defined rotation curve is derived which is essentially flat from 4 to 10 arcmin. At larger radii, the H I runs out on the SW side. The kinematical parameters are Vsys = 47 km/s, i = 38 deg, and PA = 240 deg. An analysis of the mass distribution yields a well defined ratio of dark-to-luminous matter of about 0.75 at the Holmberg radius.
Boulanger Francois
Carignan Claude
Charbonneau Patrick
Viallefond Francois
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