SIMBAD references

We present near-infrared (NIR) color maps of a sample of 41 disk galaxies in the Pisces-Perseus supercluster. The sample objects, mainly members of the Pisces cluster, are a subset of larger sample imaged in the H band. For most objects we present J-H and J-K images and elliptically-averaged radial color profiles; for some objects this is done only for the H-K color. We compute global colors, hybrid NIR-optical colors, and estimate the colors of the structural components. The J-K (global) color correlates weakly with absolute luminosity and morphological type. We observe no trend with the presence of bars and AGNs, nor with position within the cluster. The NIR disk colors are slightly bluer than the global ones, with the possible exception of those in the earliest spiral types. Finally, NIR color gradients in the images and in the radial color profiles are examined. NIR disk color gradients are small and prevalently negative; the few positive values are perhaps associated with the reddest disks.