Other
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.210..547p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 210, Oct. 1, 1984, p. 547-563. Research supported by th
Other
25
Astronomical Spectroscopy, Barred Galaxies, Galactic Rotation, Gas Dynamics, Interstellar Gas, Radial Velocity, Galactic Nuclei, Galactic Structure, H Lines, Hydrogen Clouds
Scientific paper
The gas velocity fields in the barred spiral galaxies NGC 7496 and NGC 289 have been measured using long-slit spectra from the Anglo-Australian telescope. Pronounced deviations from circular motion of the type predicted by recent theoretical models are seen in NGC 7496; the isovelocity contours are distorted into a characteristic S-shaped pattern and there is a large velocity gradient across the bar. The nuclear forbidden O III emission lines are very asymmetric with a wing extending to about 1000 km/s to the blue of the systematic velocity; this wing is only faintly seen in the Balmer lines. NGC 289 has a much smaller bar and consequently the noncircular motions are less pronounced. The kinematic major and minor axes are not perpendicular, which is a signature of oval distortions. Both galaxies have a mass of 80 billion solar masses. Neutral hydrogen contributes about 20 percent of the mass of NGC 289, but only about 2 percent of the mass of the other.
Blackman C. P.
Pence William D.
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