Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011hsa6.conf..314r&link_type=abstract
Highlights of Spanish Astrophysics VI, Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held
Astronomy and Astrophysics
Astrophysics
Scientific paper
In a series of papers we proposed a theory to explain the formation and properties of rings and spirals in barred galaxies. The building blocks of these structures are orbits trapped by the invariant manifolds of the periodic orbits around the unstable Lagrangian points located near the ends of the bar. Here we will first present a comparison of the morphology of observed and theoretical spirals and rings. We compare the ratio of ring diameters in theory and in observations and predict that more elliptical rings will correspond to stronger forcings at and somewhat beyond corotation. We show that the shapes of observed and theoretical spirals agree and predict that stronger non-axisymmetric forcings will drive more open spirals. Secondly, we will also present the kinematics along the manifold loci, to allow comparisons with the observed kinematics along the ring and spiral loci. Finally, we consider also gaseous arms and their relations to stellar ones.
Athanassoula Evangelia
Bosma Albert
Masdemont Josep J.
Romero-Gomez Merce
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