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We present high-resolution optical velocity fields from DensePak integralfield spectroscopy, along with derived rotation curves, for a sample of lowsurface brightness galaxies. In the limit of no baryons, we fit the NFW andpseudoisothermal halo models to the data and find the rotation curve shapes andhalo central densities to be better described by the isothermal halo. For thosegalaxies with photometry, we present halo fits for three assumptions of thestellar mass-to-light ratio. We find that the velocity contribution from thebaryons is significant enough in the maximum disk case that maximum disk andthe NFW halo are mutually exclusive. We find a substantial cusp mass excess atthe centers of the galaxies, with at least two times more mass expected in thecuspy CDM halo than is allowed by the data. We also find that to reconcile thedata with LCDM, ~20 km/s noncircular motions are needed and/or the powerspectrum has a lower amplitude on the scales we probe.

Mass Models for Low Surface Brightness Galaxies with High Resolution Optical Velocity Fields