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AR 16614 (Archival Research)

Sun Jul 14 20:20:43 GMT 2024

Principal Investigator: Oleg Gnedin
PI Institution: University of Michigan
Investigators (xml)

Title: Measuring sizes of young star clusters in nearby galaxies
Cycle: 29

Abstract
We propose the measure the effective radii of young star clusters in nearby galaxies identified by the Legacy ExtraGalactic UV Survey (LEGUS), a Hubble Treasury Program. We have created a pipeline to accurately and robustly measure the radii of star clusters in HST imaging, and tested it using two LEGUS galaxies. We now aim to extend it to the 7200 clusters in the full LEGUS sample, more than doubling the number of clusters with published radii. With this uniformly measured sample we will describe the distribution of cluster radii and densities, more robustly determine the cluster size-mass relation, and investigate the variation of cluster properties with age and host galaxy environment. These measurements will enable an unprecedented examination of the formation and long-term evolution of star clusters.