Dynamical Evolution of Disk Galaxies

Details Dynamical Evolution of Disk Galaxies Dynamical Evolution of Disk Galaxies

2008-03-11

arxiv.org/abs/0803.1574v2

Astronomy and Astrophysics

Astrophysics

10 pages, 1 figure - to appear in "Formation and Evolution of Galaxy Disks" eds Corsini & Funes ASP Conference series - typos

Scientific paper

Spiral patterns are important agents of galaxy evolution. In this review, I describe how the redistribution of angular momentum by recurrent transient spiral patterns causes the random speeds of stars to rise over time, metallicity gradients to be reduced, and drives large-scale turbulence in the disk, which could be important for galactic dynamos. I also outline a possible mechanism for the recurrence of spiral instabilities and supporting evidence from solar neighborhood kinematics. Finally, I confirm that cloud scattering alone would predict the local velocity ellipsoid to be flattened, contrary to long-held expectations.

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