Simulated barred galaxies show gas is removed from star formation deserts within about a billion years after the bar forms, but migrating stars blur the age signature, making bar dating harder than hoped.
Pattern speed evolution and bar reformation
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abstract
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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Redistribution of Stars and Gas in the Star Formation Deserts of Barred Galaxies
Simulated barred galaxies show gas is removed from star formation deserts within about a billion years after the bar forms, but migrating stars blur the age signature, making bar dating harder than hoped.