Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-29
Astronomy and Astrophysics
Astrophysics
6 pages, 3 figures, Proceedings of "Mapping the Galaxy and Nearby Galaxies", Eds. K. Wada & F. Combes, Springer
Scientific paper
Dynamical evolution of spiral galaxies is strongly dependent on non-axisymmetric patterns that develop from gravitational instabilities, either spontaneously or externally triggered. Some evolutionary sequences are described through which a galaxy could possibly concentrate mass and build bulges, how external gas accretion from cosmic filaments could be funneled to the galaxy disks, and intermittently driven to the galaxy center, to form nuclear starbursts and fuel an active nucleus. The frequency of both bars and lopsidedness can be used to constrain the gas accretion rate.
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