“Magic” Shells
Giant elliptical consuming a small spiral
(1/100 the mass).  Giant elliptical hardly
perturbed.  Spiral shredded.  Peter Quinn
did simulations in 1984 and succeeded in
reproducing effect.
Shells form from “quasi-radial” orbits that
are eccentric, so spend most of their time at
large radii, depending on energy.  Different
distribution than the elliptical galaxy stars.