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SIIA Público
SISTEMA INTEGRAL DE INFORMACIÓN ACADÉMICA - PÚBLICO
Título del libro: Structure And Dynamics Of Disk Galaxies Título del capítulo: Comparing Gaseous and Stellar Orbits in a Spiral Potential
It is generally assumed that gas in a galactic disk follows closely non
self-intersecting periodic stellar orbits. In order to test this common
assumption, we have performed MHD simulations of a galactic-like disk
under the influence of a spiral galactic potential. We also have
calculated the actual orbit of a gas parcel and compared it to stable
periodic stellar orbits in the same galactic potential and position. We
found that the gaseous orbits approach periodic stellar orbits far from
the major orbital resonances only. Gas orbits initialized at a given
galactocentric distance but at different azimuths can be different, and
scattering is conspicuous at certain galactocentric radii. Also, in
contrast to the stellar behavior, near the 4:1 (or higher order)
resonance the gas follows nearly circular orbits, with much shorter
radial excursions than the stars. Also, since the gas does not settle
into a steady state, the gaseous orbits do not necessarily close on
themselves.