Spiral Structure Viewed as a Density Wave
Abstract
One of the main reasons for pursuing a gravitational as opposed to a magnetic theory is that there exist galaxies which seem devoid of gas and yet show unmistakable structure. These galaxies are among those classified as SBO2/3 to SBa(r), and I shall, after Curtis, call them theta galaxies. Examples are: NGC 1512, 1291,4693, and 2859. The theta galaxies gradually merge into ringed bar galaxies, which in turn merge into ordinary spirals.
- Publication:
-
Publications of the Astronomical Society of Australia
- Pub Date:
- October 1973
- DOI:
- 10.1017/S1323358000013461
- Bibcode:
- 1973PASA....2..174K