Spectroscopy of Ellipticals
Note in particular:
Measurements do not
extend as far as for spirals,
and peak velocity is near r
= 2kpc, with slow decrease
outside this distance.
If there is rotation, how can
one figure out the
projection angle?
What can we tell about the
shape of ellipticals from
this information?
Rotation (V) and velocity dispersion (σ) curves for
some ellipticals (Davies et al. 1983)