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We construct mass models of 28 S0-Sb galaxies. The models have anaxisymmetric stellar component and a NFW dark halo and are constrained byobserved Ks-band photometry and stellar kinematics. The median dark halo virialmass is 10^12.8 Msun, and the median dark/total mass fraction is 20% within asphere of radius r_1/2, the intrinsic half-light radius, and 50% within R_25.We compare the Tully-Fisher relations of the spirals and S0s in the sample andfind that S0s are 0.5 mag fainter than spirals at Ks-band and 0.2 dex lessmassive for a given rotational velocity. We use this result to rule outscenarios in which spirals are transformed into S0s by processes which truncatestar formation without affecting galaxy dynamics or structure, and raise thepossibility of a break in homology between spirals and S0s.

Dark matter and the Tully-Fisher relations of spiral and S0 galaxies