Neal Katz (U.Mass.)
"Dynamical Friction: It's not what your father taught you!"


I will briefly review standard Chandrasekhar dynamical friction. Owing to resonant effects it does not apply in galaxies. I will then describe how dynamical friction actually works in galaxies. I will briefly discuss some consequences of this. For example, in cuspy dark matter halos the resultant wakes penetrate well into the cusp. Hence dynamical fricting substructure can greatly affect the central structure of dark matter halos, removing the cusps. Numerical noise can easily diffuse these resonances, making it a challenge to simulate correctly.

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