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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

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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 R 1 family the major axis of the ring is perpendicular to the bar and the spiral arms wind 180° before meeting the other arm. In R 2 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).

Information

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

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