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Spiral Structure Viewed as a Density Wave

Published online by Cambridge University Press:  25 April 2016

A. J. Kalnajs
A. J. Kalnajs*
Affiliation:
Mount Stromlo and Siding Spring Observatory, Research School of Physical Sciences, Australian National University
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Extract

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.

Type
Invited Papers
Information
Publications of the Astronomical Society of Australia , Volume 2 , Issue 4 , October 1973 , pp. 174 - 177
Copyright
Copyright © Astronomical Society of Australia 1973

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