On the origin of rR_1 ring structures in barred galaxies

Abstract

We propose a new theory for the formation of rR_1 ring structures, i.e. for ring structures with both an inner and an outer ring, the latter having the form of ``8''. We propose that these rings are formed by material from the stable and unstable invariant manifolds associated with the Lyapunov orbits around the equilibrium points of a barred galaxy. We discuss the shape and velocity structure of the rings thus formed and argue that they are in agreement with the observed properties of rR_1 structures.

arXiv comment8 pages, 9 figures, accepted in Astronomy and Astrophysics. High quality figures are available upon request

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