Formation and properties of persisting stellar bars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Barred Galaxies, Disk Galaxies, Galactic Evolution, Galactic Structure, Halos, Mathematical Models, Fourier Analysis, Fourier Transformation, Galactic Rotation, Gas Dynamics, Gravitational Fields, Interstellar Gas, Spiral Galaxies

Scientific paper

Long time-scale three-dimensional N-body simulations of galaxies composed of two components, a self-consistent disk and a spheroidal halo, demonstrate that bars develop over a large range of halo mass to disk mass ratios. Such nonaxisymmetric systems dynamically evolve at a rate which depends upon this ratio. For systems with low mass halos (the ratio being less than or equal to 1), strong bars quickly form but then weaken to a quasi steady state in less than twenty rotation times. For systems with high halo mass, the bar strength is still increasing after 20 rotation times. This suggests that the strong bars observed in SBb galaxies have not persisted since the epoch of galaxy formation but have developed more recently in systems with the ratio being greater than or equal to 2.

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