Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2024-12-23T07:08:31.268Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1 Curtis, H.D., Publ. Lick Obs., 13, 9 (1918).Google Scholar
2 Lin, C.C., Yuan, C. and Shu, F.H., Ap.J., 155, 721 (1969).CrossRefGoogle Scholar
3 Lin, C.C., Highlights of Astronomy, ed. Jaeger, C. de, Reidel, Dordrecht, Holland, 1971, vol. 2, p. 88.Google Scholar
4 Kalnajs, A.J., The Observatory, 93, 39 (1973).Google Scholar
5 Toomre, A., Ap.J., 158, 899 (1969).CrossRefGoogle Scholar
6 Kalnajs, A.J., Ap.Letters, 11, 41 (1972).Google Scholar
7 Hohl, F., Ap.J., 168, 343 (1971).Google Scholar
8 Hénon, M., Ann.d’Ap., 22, 491 (1959).Google Scholar
9 Eggen, O.J., Lyndel-Bell, D. and Sandage, A., Ap.J., 136, 748 (1962).Google Scholar
10 Lindblad, B., Stockholms Ann., 19, No. 7 (1956).Google Scholar
11 Fujimoto, M., I.A.U. Symp. No. 29, 453 (1966).Google Scholar
12 Roberts, W.W., Ap.J., 158, 123 (1969).Google Scholar
13 Kalnajs, A.J., Ap.J., 175, 63 (1972).CrossRefGoogle Scholar
14 Lynden-Bell, D. and Kalnajs, A.J., M.N.R.A.S., 157, 1 (1972).Google Scholar