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)