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Ring-shaped morphologies of nuclear star-forming regions within the central40-200 pc of disk galaxies have been barely resolved so far in three compositeSy2 nuclei, the Sy2 Circinus galaxy and in three non-AGN galaxies. Suchmorphologies resemble those of the standard 1 kpc-size nuclear rings that liein the inner Lindblad resonance regions of disk galaxies and, if they have asimilar origin, represent recent radial gas inflows tantalisingly close to thecentral supermassive black holes. We aim to identify the population of suchultra-compact nuclear rings (UCNRs) and study their properties in relation tothose of the host galaxies. From archival Hubble Space Telescope UV and Halphaimages and from dust structure maps of the circumnuclear regions in nearbygalaxies, we analyse the morphology of the star formation and dust,specifically searching for ring structures on the smallest observable scales.In a sample of 38 galaxies studied, we have detected a total of four new UCNRs,30-130 pc in radius, in three different galaxies. Including our confirmation ofa previous UCNR detection, this yields a UCNR fraction of roughly 10%, althoughour sample is neither complete nor unbiased. For the first time we resolveUCNRs in two LINERs. Overall the UCNR phenomenon appears widespread and limitedneither to late-type galaxies nor exclusively to AGN hosts.

Discovery of ultra-compact nuclear rings in three spiral galaxies