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We present an atlas of the central regions of 75 Seyfert galaxies imaged inthe near-UV with the Advanced Camera for Surveys of the Hubble Space Telescopeat an average resolution of ~10pc. These data complement archival highresolution data from the Space Telescope at optical and near-IR wavelengths,creating an extremely valuable dataset for astronomers with a broad range ofscientific interests. Our goal is to investigate the nature of the near-UVlight in these objects, its relation to the circumnuclear starburst phenomenon,and the connection of this to the evolution and growth of the galaxy bulge andcentral black hole. In this paper, we describe the near-UV morphology of theobjects and characterize the near-UV emission. We estimate the size and theluminosity of the emitting regions and extract the luminosity profile. We alsodetermine the presence of unresolved compact nuclei. In addition, thecircumnuclear stellar cluster population is identified, and the contribution ofthe stellar clusters to the total light, at this wavelength, is estimated. Thesize of the sample allows us to draw robust statistical conclusions. We findthat {Seyfert 1} galaxies are completely dominated by its bright and compactnucleus, that remains point-like at this resolution, while we find almost nounresolved nucleus in Seyfert 2. The Seyfert types 1 and 2 are quite segregatedin an asymmetry vs compactness plot. Stellar clusters are found somewhat morefrequently in Sy2 (in ~70% of the galaxies) than in Sy1 (~57%), and contributemore to the total light in Sy2, but this two differences seem to be mostly dueto the large contribution of the compact nucleus in Sy1, as the luminositydistribution of the clusters is similar in both Sy types.

An Atlas of the circumnuclear regions of 75 Seyfert galaxies in the near-UV with HST Advanced Camera for Surveys