Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8232c&link_type=abstract
HST Proposal ID #8232
Other
Hst Proposal Id #8232 Galaxy Populations And Interactions
Scientific paper
Local starbursts are the most immediate counterparts to the high-redshift, actively-star-forming galaxies, and the study of starbursts and their constituents can shed light on the initial phases of galaxy evolution. We propose to use STIS UV spetroscopy to derive an accurate age for the youngest super- star-cluster candidate known to date in a nearby starburst galaxy. The stellar cluster is located in the dwarf galaxy NGC5253 at a distance of 4 Mpc. Its HAlpha equivalent width {from WFPC2 imaging} gives an estimated age of 2 Myr, and more accurate determinations are hampered by the presence of heavy dust reddening in the region. The cluster is bright enough in the UV to make the project feasible with STIS and produce an age determination with an accuracy +/-0.5 Myr. We will exploit the STIS long slit to derive an accurate age also for the oldest among the bright stellar clusters { 50 Myr, estimated from WFPC2 colors}. We will use the new data to: {1} break the age/dust degeneracy, derive the intrinsic luminosity of the clusters, and verify whether they are proto-globular cluster candidates; {2} use the UV spectroscopy-derived ages to calibrate the color-derived ages of the other stellar clusters in the starburst; {3} use the spatial distribution of the calibrated ages to investigate the spatial and temporal evolution {e.g., propagation} of the starburst in NGC5253.
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