Theoretical astrophysics and plasma physics at RPC

Abstract:

I apply constant-anisotropy spherical dynamical models to a sample of 18 round ellipticals to look for evidence of dark halos. All 18 lie along a Tully-Fisher relation parallel to that for spirals, but fainter at given upsilon(c) by about 1 mag. By constructing more general, flattened models, I show there is a degeneracy between anisotropy and flattening, and discuss its implications.