Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2024-12-26T04:08:06.237Z Has data issue: false hasContentIssue false
  • English
  • Français

Presence and Absence of Outer Rings in Barred Galaxies

Published online by Cambridge University Press:  12 April 2016

P. Rautiainen  and
H. Salo
P. Rautiainen
Affiliation:
Astronomy Division, Department of Physical Sciences, University of Oulu, Finland
H. Salo
Affiliation:
Astronomy Division, Department of Physical Sciences, University of Oulu, Finland

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Many barred spiral galaxies have an outer ring (R) or a pseudoring (R') in their outer disk. R. Buta (e.g. Buta 1995) has developed a detailed classification for different types of outer rings. Two main families of outer rings are recognized. In R1 family the major axis of the ring is perpendicular to the bar and the spiral arms wind 180° before meeting the other arm. In R2 family the major axis of the ring is parallel to the bar and the spiral arms wind 270°.

The outer rings are usually considered to be related to the outer Lindblad resonance (OLR) of a rotating stellar bar. The ring shapes correspond to families of closed orbits in the vicinity of this resonance (e.g. Contopoulos & Grosbøl 1989), and also the sizes of the outer rings relative to the bar component fit to this suggestion. Furthermore, test-particle simulations which use analytical bar potentials can produce different types of outer rings near the OLR (Schwarz 1981; Byrd et al. 1994). We have obtained similar results when we modelled ringed galaxy IC 4214 by constructing the gravitational potential from near-IR observations (Buta et al. 1999; Salo et al. 1999).

Type
Part 3. Numerical Simulations
Information
International Astronomical Union Colloquium , Volume 174: Small Galaxy Groups , 2000 , pp. 330 - 333
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

Buta, R. 1995, ApJS, 96, 39 Google Scholar
Buta, R., Crocker, D.A. 1991, AJ, 102, 1715 Google Scholar
Buta, R., Purcell, G.B., Cobb, M.L., Crocker, D.A., Rautiainen, P., Salo, H. 1999, AJ, 117, 778 Google Scholar
Byrd, G., Rautiainen, P., Salo, H., Buta, R., Crocker, D.A., 1994, AJ, 108, 476 Google Scholar
Contopoulos, G., Grosbøl, P., 1989, A&A Rev., 1, 261 Google Scholar
Elmegreen, D.M., Elmegreen, B.G., Combes, F., Bellin, A.D. 1992, A&A, 257, 17 Google Scholar
Friedli, D., Benz, W., 1993, A&A, 268, 65 Google Scholar
Masset, F., Tagger, M. 1997, A&A, 322, 442 Google Scholar
Noguchi, M. 1987, MNRAS, 228, 635 Google Scholar
Noguchi, M. 1996, ApJ, 469, 605 Google Scholar
Norman, C.A., Sellwood, J.A., Hasan, H., 1996, ApJ, 462, 114 Google Scholar
Rautiainen, P., Salo, H. 1999, accepted to A&AGoogle Scholar
Salo, H., Rautiainen, P., Buta, R., Purcell, G.B., Lewis Cobb, M., Crocker, D.A., Laurikainen, E. 1999, AJ, 117, 792 Google Scholar
Schwarz, M.P., 1981, ApJ, 247, 77 Google Scholar
Sellwood, J.A., Sparke, L.S. 1988, MNRAS, 231, 25 Google Scholar
Tagger, M., Sygnet, J.F., Athanassoula, E., Pellat, R. 1987, ApJ, 318, L43 Google Scholar