Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...150..112p&link_type=abstract
Astronomy and Astrophysics, Vol.150, NO. 1/SEP(I), P. 112, 1985
Astronomy and Astrophysics
Astrophysics
49
Scientific paper
The previous experience gained by the study of simple mappings (Pfenniger 1985a, Paper I) is used for exploring the transition to complex instability of the most important 3D family of periodic orbits occurring in the bulge of a rapidly rotating barred galaxy model. This transition is also the most important one of this kind in the model, by its extension in phase space and parameter space. The family is of resonance frequency ratios 4/4/1, which favors the growth of a box-shaped bulge. Furthermore, the projected edge-on density and velocity field due to these orbits is compatible with the observed cylindrical rotation of such box- shaped bulges. The principal feature found with the mappings of Paper I, a Hopf-like bifurcation, exists also in the galactic potential. The main effect of complex instability in the bulge is to allow a fast diffusion of low angular momentum, high z-amplitude and energetic stars into the nearby halo, in the case of a growing bar. The semi-ergodic diffusion is studied and found to be an interesting possibility for populating the inner halo.
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