Computer Science
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12229s&link_type=abstract
HST Proposal ID #12229. Cycle 18
Computer Science
Scientific paper
We propose a small Snapshot program to obtain U-band imaging of a sample of 22 nearby star-forming galaxies with existing HST B, V, and I-band imaging. With the high UV efficiency and large field of view of WFC3/UVIS, it is now possible to obtain deep U-band imaging for a large sample of galaxies, and address fundamental questions on the cluster systems which can only now be answered. We will focus mainly on the young stellar cluster populations of these galaxies and use the deep U-band observations to accurately age date tens or even hundreds of clusters in each galaxy. By measuring the ages and masses of the cluster populations, we will be able to answer many of the outstanding questions regarding their properties, survival rates, cluster formation histories and environmental dependencies. The overall aim will be to relate cluster formation and cluster properties to the star formation rates and morphologies of their host galaxies. In particular, this dataset will be used to: 1} constrain the fraction of stars that form in clusters and search for environmental dependencies; 2} study the cluster luminosity/mass function and determine if a characteristic mass exists in the distribution; 3} measure the size {radius} distribution of the clusters and determine if this has a dependence on environment; 4} empirically constrain cluster disruption laws; and 5} determine the star/cluster formation histories of these galaxies over the past Gyr. This survey will complement existing imaging and will provide a rich legacy dataset for the entire community. We waive the 12 month proprietary period.;
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