Pattern speed evolution and bar reformation

F. Combes (LERMA; Observatoire de Paris)

Pattern speed evolution and bar reformation

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arxiv 0811.0153 v2 pith:L6HVWKZQ submitted 2008-11-02 astro-ph

F. Combes (LERMA , Observatoire de Paris) This is my paper · ORCID

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keywords patternbarsgalaxyspeedsspiraltypeaccretedangular

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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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