Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...233..372b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 2, July 1990, p. 372-378.
Astronomy and Astrophysics
Astrophysics
6
Galactic Structure, H Beta Line, Spiral Galaxies, Stellar Motions, Velocity Distribution, Astronomical Spectroscopy, Emission Spectra, Stellar Luminosity
Scientific paper
Stellar ad H-beta emission line radial velocities and stellar velocity dispersion measurements of the bar of the face-on SBc spiral galaxy NGC 3059 are presented. Along the major axis of the bar the radial velocities are constant, but going in a direction perpendicular to the bar from one side to the other, there is a substantial velocity increment of 70 km/s. Assuming that the systematic motions are confined to the plane of the galaxy, this jump can be explained by a stellar streaming of about 100 km/s along the bar, as predicted by numerical studies. The emission line radial velocities generally follow the stellar velocities with some small scale deviations. The stellar velocity dispersion is essentially constant at a level of 53 + or - 5 km/s in the bar, and drops steeply outside. Comparison with z-direction bar dispersions of other galaxies shows that, this value is considerably lower than the average value of 140 km/s for SB0 galaxy bars.
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