for 32 Hickson compact group galaxies and found that 2/3 of them had peculiar rotation curves. For the subsample of galaxies for which rotation curves were possible to be derived, they found a large offset of the T-F relation with respect to the field relation in the sense that galaxies in compact groups have “too low velocities for their luminosities or, alternatively, luminosities which are overbright for their rotation velocities.” This suggested to the authors that spiral galaxies in compact groups have low mass-to-light ratios compared to field galaxies by about 30% which, in turn, could be explained if compact group galaxies have smaller dark halos than their field counterparts. Given that compact groups are environments where tidal encounters are common, it may be expected that interactions have stripped or disrupted the galaxy dark halos at some level. These conclusions have important consequences for the determination of group lifetimes and understanding how compact groups evolve and eventually merge.

We revisit this important problem using a new dataset for 25 galaxies, of which 13 are in common with either the sample of R1991 or N2000 or both. In this paper we re-examine the T-F relation for compact group galaxies. Our study 