Young Star Clusters: Metallicity Tracers in External Galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Star cluster formation is a major mode of star formation in the extreme conditions of interacting galaxies and violent starbursts. Young clusters are observed to form in a variety of such galaxies. These clusters are built out of recycled gas pre-enriched to various levels within the interacting galaxies. This enhanced metallicity makes them outstanding in comparison to the old metal-poor proto-type globulars and traces the metallicity of molecular gas during the cluster formation. Star clusters of different ages therefore represent a fossil record of the chemical enrichment history of its host galaxy as well as of its violent star formation history. We will present a new set of evolutionary synthesis models of our GALEV code specially developed to account for the gaseous emission of presently forming star clusters and a new tool to fit these models with multi-color observations. Tests of both components are reviewed. First results of newly-born clusters in mergers and starburst galaxies are presented and compared to the well-studied old globulars. Similarities and differences are pointed out and interpreted in the framework of galaxy formation / evolution.

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