Poster Title: Mixed stellar populations in integrated spectra of Nuclear star clusters
Abstract: Despite their shallow central gravitational potential, late-type bulge-less spiral galaxies frequently harbor a luminous compact stellar cluster in their dynamical center. Masses for these nuclear clusters of around 10^7 Msun are one order of magnitude higher than those of massive normal globular clusters, while their sizes of around 5 pc are comparable. We here use high-resolution (0.05A) spectra from UVES at the VLT to analyze the stellar content of this new class of massive stellar clusters. We explore ways to constrain the star formation history in the clusters from the integrated spectra with the help of the new stellar population synthesis models of Bruzual & Charlot 2003. The spectra show the presence of mixed stellar populations from multiple epochs of star formation. We conclude that repetitive events of star formation occur in the clusters and give an estimate of the duty cycle.
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