Detecting Adiabatic Contraction in Rotation Curves
  We examine the structure of adiabatically contracted Einasto profiles, using
the prescriptions of Blumenthal et al. (1986) and Gnedin et al. (2004), and its
impact on rotation curves. Adiabatically contracted halos display a central
power index of ~0.7+/-0.1 for nearly all values of the Einasto shape parameter,
alpha, and are well fit inside ~>1 kpc by double power laws. However, attempts
to fit exponential disc and uncontracted halos to adiabatically contracted
rotation curves yield disc masses and central power indices that are too large.
We also determine whether or not the rotation curve of NGC 6503 displays
evidence of adiabatic contraction using previously published bar formation
constraints, and find that NGC 6503 most likely has a minimally contracted
halo. However, this conclusion depends on the correct choice of circular
velocity curve.
