Pattern speed evolution and bar reformation

Details Pattern speed evolution and bar reformation Pattern speed evolution and bar reformation

2008-11-02

arxiv.org/abs/0811.0153v2

Astronomy and Astrophysics

Astrophysics

8 pages, 7 figures, Proceedings of "Pattern Speeds along the Hubble Sequence", Padova, Italy, August 2008, ed. E. Corsini and

Scientific paper

Bars in spiral galaxies can weaken through gas inflow towards the center, and angular momentum transfer. Several bar episodes can follow one another in the life of the galaxy, if sufficient gas is accreted from the intergalactic medium to revive young disks. Pattern speeds of the successive bars are different, due to mass concentration, or increased velocity dispersion of the remaining stellar component. In the same time, the spiral galaxy evolves in morphological type. Numerical simulations are presented, trying to correlate type and bar pattern speeds.

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