Bars within Bars in Galaxies

Details Bars within Bars in Galaxies Bars within Bars in Galaxies

1998-12-11

arxiv.org/abs/astro-ph/9812228v1

Astronomy and Astrophysics

Astrophysics

4 pages, including 1 figure, pasp style. To appear in the proceedings of "Galaxy Dynamics" conference held in Rutgers, August

Scientific paper

Inner regions of barred disk galaxies often include asymmetrical, small-scale central features, some of which are best described as secondary bars. Because orbital timescales in the galaxy center are short, secondary bars are likely to be dynamically decoupled from the main kiloparsec-scale bars. We found that non-chaotic multiply-periodic particle orbits can exist in potentials with two dynamically decoupled bars.Stars trapped around these orbits could form the building blocks for a long-lived, doubly-barred galaxy. A self-consistent secondary bar appears to induce formation of inner gaseous rings rather than shocks in gas flow.

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