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We investigate the structural properties of nuclear star clusters inlate-type spiral galaxies. More specifically, we fit analytical models to HSTimages of 39 nuclear clusters in order to determine their effective radii aftercorrection for the instrumental point spread function. We use the results ofthis analysis to compare the luminosities and sizes of nuclear star clusters tothose of other ellipsoidal stellar systems, in particular the Milky Wayglobular clusters. Our nuclear clusters have a median effective radius of r_e =3.5 pc, with 50% of the sample falling between 2.4 pc < r_e < 5.0 pc. Thisnarrow size distribution is statistically indistinguishable from that ofGalactic globular clusters, even though the nuclear clusters are on average 4magnitudes brighter than the old globulars. We discuss some possibleinterpretations of this result. From a comparison of nuclear clusterluminosities with various properties of their host galaxies, we confirm thatmore luminous galaxies harbor more luminous nuclear clusters. It remainsunclear whether this correlation mainly reflects the influence of galaxy size,mass, and/or star formation rate. Since the brighter galaxies in our sampletypically have stellar disks with a higher central surface brightness, nuclearcluster luminosity also correlates with this property of their hosts. On theother hand, we find no evidence for a correlation between the presence of anuclear star cluster and the presence of a large-scale stellar bar.Comment: 32 pages incl. 11 figures. Accepted for publication in AJ (Jan. 2004  issue

AHubble Space TelescopeCensus of Nuclear Star Clusters in Late-Type Spiral Galaxies. II. Cluster Sizes and Structural Parameter Correlations