Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546324w&link_type=abstract
American Astronomical Society, AAS Meeting #215, #463.24; Bulletin of the American Astronomical Society, Vol. 36, p.1114
Astronomy and Astrophysics
Astronomy
Scientific paper
The morphology of H-alpha line emission is used to age-date very young (t < 10 Myr) star clusters in the nearby grand-design spiral galaxy M83, based on our new WFC3 observations. The basic premise is that the distribution of H-alpha is largely coincident with the distribution of cluster light in the youngest clusters (i.e., < few Myr), is in a small ring-like structure around the cluster in slightly older clusters where stellar winds from the massive stars have had time to blow a bubble (i.e., 5 Myr), and is in a larger ring-like bubble for still older clusters (i.e., 5 - 10 Myr). Comparisons are made with other methods of age-dating the clusters, namely SED fitting of the integrated UBVI light from the clusters, and isochrone fitting of individual stars in the outskirts of clusters. A comparison is made with our similar study in M51. This project is based on Early Release Science observations made by the WFC3 Scientific Oversight Committee. We are grateful to the Director of the Space Telescope Science Institute for awarding Director's Discretionary time for this program. Support for program #11360 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.
Calzetti Daniela
Chandar Rupali
Kaleida Catherine
Kim Hungsoo
Maíz Apellániz Jesus
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