We present a comparative confrontation of both the Bose-Einstein Condensate
(BEC) and the Navarro-Frenk-White (NFW) dark halo models with galactic rotation
curves. We employ 6 High Surface Brightness (HSB), 6 Low Surface Brightness
(LSB), and 7 dwarf galaxies with rotation curves falling into two classes. In
the first class rotational velocities increase with radius over the observed
range.The BEC and NFW models give comparable fits for HSB and LSB galaxies of
this type, while for dwarf galaxies the fit is significantly better with the
BEC model. In the second class the rotational velocity of HSB and LSB galaxies
exhibits long flat plateaus, resulting in better fit with the NFW model for HSB
galaxies and comparable fits for LSB galaxies. We conclude that due to its
central density cusp avoidance the BEC model fits better dwarf galaxy dark
matter distribution. Nevertheless it suffers from sharp cutoff in larger
galaxies, where the NFW model performs better. The investigated galaxy sample
obeys the Tully-Fisher relation, including the particular characteristics
exhibited by dwarf galaxies. In both models the fitting enforces a relation
between dark matter parameters: the characteristic density and the
corresponding characteristic distance scale with an inverse power.Comment: published versio
