M82 as a Fossil Starburst: Probing the Super Star Cluster Content of Region B

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The importance of M82 as a benchmark for starburst studies has been recognised by the STScI-sponsored ACS/WFC mosaic of M82 in the B, V, I and H alpha filters. This proposal supplements this unique legacy dataset by obtaining U-band observations F330W filter of the fossil starburst region B in M82. This region is rich in compact intermediate age ~ 1 Gyr star clusters. The combination of U-band photometry with the ACS/WFC STScI BVI survey and archival NICMOS JH data will allow us to derive accurate ages, luminosities and masses for this rare population of intermediate age massive star clusters. The U-band is essential for determining ages of clusters < 2 Gyr old because it measures the depth of the Balmer jump. We will use these data to determine the true shape of the cluster luminosity function CLF for the M82-B fossil starburst region and thus address the question of whether young massive clusters will eventually become globular clusters.

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