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Secular evolution in galaxies

Published online by Cambridge University Press:  01 August 2006

F. Combes
F. Combes*
Affiliation:
LERMA, Observatoire de Paris, 61 Av. de l'Observatoire, F-75014, Paris, France email: francoise.combes@obspm.fr
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Abstract

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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.

Keywords

galaxies: generalgalaxies: spiralgalaxies: bulgesgalaxies: evolutiongalaxies: formationgalaxies: starburstgalaxies: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 19 - 23
Copyright
Copyright © International Astronomical Union 2007

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