Mapping the Stellar Dynamics of M31
H.R.Merrett1, M.R.Merrifield,
K.Kuijken, A.J.Romanowsky, N.G.Douglas,
N.R.Napolitano, M.Arnaboldi, M.Capaccioli, K.C.Freeman, O.Gerhard,
D.Carter, N.W.Evans, M.I.Wilkinson, C.Halliday, T.J.Bridges
1University of Nottingham, UK
In order to understand the detailed structure and dynamics of a galaxy
a large number of kinematic tracer objects are required. To this end,
we have performed a survey of planetary nebula velocities in the
Andromeda galaxy using the Planetary Nebula Spectrograph. The survey
covers the disk, extending out ~3 degrees along the major axis; the
halo, out to ~1.5 degrees along the minor axis; the southern stream;
and the northern spur. 2766 PNe have been identified in the survey,
allowing the rotation to be measured in some detail. Superimposed over
the rotation are PNe belonging to the dwarf galaxies M32, NGC 205 and
AND IV and a number of PNe who may be associated with the stellar stream.