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We obtained Hubble Space Telescope/Wide Field Camera 3 imaging of a sample often of the nearest and brightest nuclear clusters residing in late-type spiralgalaxies, in seven bands that span the near-ultraviolet to the near-infrared.Structural properties of the clusters were measured by fitting two-dimensionalsurface brightness profiles to the images using GALFIT. The clusters exhibit awide range of structural properties. For six of the ten clusters in our sample,we find changes in the effective radius with wavelength, suggesting radiallyvarying stellar populations. In four of the objects, the effective radiusincreases with wavelength, indicating the presence of a younger populationwhich is more concentrated than the bulk of the stars in the cluster. However,we find a general decrease in effective radius with wavelength in two of theobjects in our sample, which may indicate extended, circumnuclear starformation. We also find a general trend of increasing roundness of the clustersat longer wavelengths, as well as a correlation between the axis ratios of theNCs and their host galaxies. These observations indicate that blue disksaligned with the host galaxy plane are a common feature of nuclear clusters inlate-type galaxies, but are difficult to detect in galaxies that are close toface-on. In color-color diagrams spanning the near-UV through the near-IR, mostof the clusters lie far from single-burst evolutionary tracks, showing evidencefor multi-age populations. Most of the clusters have integrated colorsconsistent with a mix of an old population (> 1 Gyr) and a young population(~100-300 Myr). The wide wavelength coverage of our data provides a sensitivityto populations with a mix of ages that would not be possible to achieve withimaging in optical bands only.

The Structure of Nuclear Star Clusters in Nearby Late-type Spiral Galaxies from Hubble Space Telescope Wide Field Camera 3 Imaging