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We present the Snapshot Hubble U-band Cluster Survey (SHUCS), an ongoing deepU-band imaging survey of nearby star-forming galaxies. Thanks to theinformation provided by the U band, together with archival Hubble SpaceTelescope (HST) optical data, we are able to constrain reliable ages, masses,and extinctions of the cluster populations of these galaxies. We show somepreliminary results from the study of one of the SHUCS galaxies, NGC 2146.Using the recovered cluster ages we try to understand the propagation of thestar formation in one of the tidal streams where a ring-like cluster complexhas been found. The Ruby Ring, so named due to its appearance, shows a clearring-like distribution of star clusters around a central object. We findevidence of a spatial and temporal correlation between the central cluster andthe clusters in the ring. The Ruby Ring is the product of an intense andlocalised burst of star formation, similar to the extended cluster complexesobserved in M 51 and the Antennae, but more impressive because is quiteisolated. We discuss the formation of the Ruby Ring in a "collect & collapse"framework. The predictions made by this model agree quite well with theestimated bubble radius and expansion velocity produced by the feedback fromthe central cluster, making the Ruby Ring an interesting case of triggered starformation.

The Snapshot Hubble U-band Cluster Survey; A cluster complex in NGC 2146