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Detailed neutral hydrogen observations have been obtained of the large barredspiral galaxy NGC 3992 and its three small companion galaxies, UGC 6923, UGC6940, and UGC 6969. For the main galaxy, the HI distribution is regular with alow level radial extension outside the stellar disc. However, at exactly theregion of the bar, there is a pronounced central HI hole in the gasdistribution. Likely gas has been transported inwards by the bar and because ofthe emptyness of the hole no large accretion events can have happened in recentgalactic times. The gas kinematics is very regular and it is demonstrated thatthe influence of the bar potential on the velocity field is negligible. Aprecise and extended rotation curve has been derived showing some distinctfeatures which can be explained by the non-exponential radial lightdistribution of NGC 3992. The decomposition of the rotation curve gives aslight preference for a sub maximal disc, though a range of disc contributions,up to a maximum disc situation fits nearly equally well. For such a maximumdisc contribution, which might be expected in order to generate and maintainthe bar, the required mass-to-light ratio is large but not exceptional.

Dark and luminous matter in the NGC 3992 group of galaxies