Computer Science
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9522s&link_type=abstract
HST Proposal ID #9522
Computer Science
Hst Proposal Id #9522 Galaxies
Scientific paper
About half of all spiral and S0 galaxies are barred: recent observations show that the main bar often harbors one, and sometimes two, smaller `nuclear bars'. The gravitational potential of these inner bars will strongly influence the flow of gas in the central regions. Because dynamical times in the central galaxy are short, small nuclear bars can start growing well before the disk assembly is complete. Early in a galaxy's history, these central bars may have acted to funnel gas inward to allow rapid growth of the central black holes that power active nuclei, before the black hole's strengthening gravity shuts off the inflow, or destroys the bar. A central bar can also prevent a youthful disk from developing a larger, kiloparsec-scale bar, until the disk has grown far enough in radius to accomodate an outer bar that is suitably larger than the inner one. To explore these scenarios, we propose to use our novel method of emphinvariant loops, to investigate which combinations of bar mass, size, axis ratio and pattern speed allow `dynamically possible' double-bar systems. Using hydrodynamic simulations, we will follow the fate of gas in such systems, and compare the flow patterns to those observed in STIS studies of galaxy centers. Finally, gravitational body simulations will allow us to build gravitationally-self-consistent double-bar models, and to predict stellar motions within them.
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