Kinematics of Star Clusters in M101
  We have identified a few thousand star clusters in the nearby, late-type
spiral galaxy M101, including approximately 90 candidate ancient globular
clusters (GCs), from multi-band Hubble Space Telescope (HST) images. We
obtained follow-up low-resolution (R approximately 2000) optical spectroscopy
from Gemini-GMOS for 43 total clusters, of which 18 are old GCs and 25 are
young massive clusters (YMCs). We measure radial velocities for these clusters
and find that, as expected, the YMCs rotate with the HI disk. The old GCs do
not show any obvious evidence for rotation and have a much higher velocity
dispersion than the YMCs, suggesting that the GCs in M101 are likely part of a
stellar halo or thick disk.
