Flared outer disk or Ring around the Galaxy?
Heather Morrison (Case Western Reserve University)
I will present recent spectroscopy from a multi-faceted study of the
Milky Way halo (the Spaghetti survey). Our results call into question
the identification of structures toward the edge of the Milky Way disk
(eg Monceros; the Ring around the Galaxy) with debris from accretions
of dwarf satellites. Our velocity data (and that of Yanny et al 2003)
show that these detections are consistent with a simpler explanation:
a flared outer disk caused by interaction with a still undiscovered
dwarf which heated the outer disk.
