Secular evolution in galaxies

Details Secular evolution in galaxies Secular evolution in galaxies

2006-08-29

arxiv.org/abs/astro-ph/0608612v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, Proceedings of IAU Symp 235, "Galaxy Evolution across the Hubble Time", Eds. F. Combes & Jan Palous, Cambr

Scientific paper

New observations in favour of a significant role of secular evolution are reviewed: central star formation boosted in pseudo-bulge barred galaxies, relations between bulge and disk, evidence for rejuvenated bulges. Numerical simulations have shown that secular evolution can occur through a cycle of bar formation and destruction, in which the gas plays a major role. Since bars are weakened or destroyed in gaseous disks, the high frequency of bars observed today requires external cold gas accretion, to replenish the disk and allow a new bar formation. The rate of gas accretion from external filaments is compatible with what is observed in cosmological simulations.

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