Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9720c&link_type=abstract
HST Proposal ID #9720
Physics
Hst Proposal Id #9720 Galaxies
Scientific paper
M101 represents perhaps our best chance to study the stellar population of a luminous, late type spiral galaxy, due to both its proximity and its face-on orientation. For these reasons, 13 orbits of HST ACS observing time were allocated in Cycle 11 to obtain a 4x4 mosaic image of M101 in BVI . Unfortunately, a degeneracy between age and reddening exists when only these three bands are available. Hence, we propose to augment these observations by obtaining WFPC2 U band and ACS H alpha images. This will enable the accurate determination of ages for the young clusters, secure identifications of 75-100 old globular clusters, and allow a quantitative study of the HII region sizes and structures. Some of the specific questions we will address are: How do the young clusters form and evolve? What fraction of the clusters dissolve and on what timescales? Do clusters evolve with a continuum of properties? Using WFPC2 and ACS in parallel, and making use of the fact that M101 is in the CVZ, allows us to greatly enhance the science return of previous HST observations for the cost of only 4 orbits.
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