The dark matter halo density profile, spiral arm morphology and black
  hole mass of M33
  In this paper, we investigate the dark matter halo density profile of M33. We
find that the HI rotation curve of M33 is best described by a NFW dark matter
halo density profile model, with a halo concentration of cvir = 4.0\pm1.0 and a
virial mass of Mvir = (2.2\pm0.1)\times10^11 Msun. We go on to use the NFW
concentration (cvir)of M33, along with the values derived for other galaxies
(as found in the literature), to show that cvir correlates with both spiral arm
pitch angle and supermassive black hole mass.
