Kinematics and dynamics of barred spiral galaxies
The kinematics and dynamics of a group of barred spiral galaxies are analyzed. Hydrodynamical models using the beam scheme are calculated and provide a set of dynamical properties for barred spiral galaxies. Neutral hydrogen radio observations of NGC 1300 show the galaxy to be an excellent example of a grand design spiral system. The HI gas is confined almost entirely to the spiral arms with very little interarm gas. These HI arms correlate very well with the position of the optical arms. The HI arms can be traced through about 310 degrees in azimuth. The central region, the region occupied by the bar, is deficient in gas. The velocity field shows that circular motion is the dominant component but that large noncircular motions, mainly in the arms, are present. The rotation curve rises to a maximum of 185 km/sec at r = 2.5' and then remains essentially flat out to about r = 3.2'. Near infrared surface photometry is used to calculate a triaxial ellipsoidal figure for the bar. Blue and 2.2um photometry is analyzed and compared with the I band and 21 cm observations. Hydrodynamical models for 21 cm are partially successful in reproducing the observed morphology and kinematics of NGC 1300.
- Research Organization:
- Florida Univ., Gainesville (USA)
- OSTI ID:
- 5966020
- Country of Publication:
- United States
- Language:
- English
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