Title:Stellar kinematics of the And II dSph: Discovery of a rotating dSph. 

Abstract: We present kinematic profiles for the M31 dwarf spheroidal (dSph) satellite 
galaxy Andromeda II (And II) based on Keck DEIMOS spectroscopy.  We identify 537 
individual red giant branch stars in this galaxy using photometric and spectroscopic 
diagnostics to remove contamination from Milky Way dwarf and M31 field stars.  By 
measuring accurate radial velocities of stars out to 2.5 effective radii, with a median 
error of 5.2 km/s, we find a mean systemic velocity of -192.3 km/s.  We measure an 
average velocity dispersion of 8.8 km/s and observe a flat dispersion profile  for the 
major axis.  We also measure an average velocity dispersion of 7.5 km/s and a 
maximum rotational velocity of 10.5 km/s along the minor axis.  With a v/sigma of  1.4, 
And II is the first rotationally dominated dSph galaxy discovered along with being the 
first dSph to show prolate rotation.  Given its large distance from M31 resulting in a 
King tidal radius of ~4 effective radii, which our data is well within, tides are not likely to 
have affected the internal kinematics of And II.