Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9739c&link_type=abstract
HST Proposal ID #9739
Physics
Hst Proposal Id #9739 Galaxies
Scientific paper
We propose to explore the ages, extinctions, and masses of young stellar clusters in four nearby dwarf starburst galaxies {He 2-10, NGC 5253, NGC 4214, and IIZw40}. We will combine available archival data with new, high resolution HST observations from the ultraviolet to the infrared. All four galaxies are known from ground based radio/infrared observations to contain highly obscured, massive stellar clusters, which dominate the far infrared flux. Despite the fact that almost all of the infrared flux comes from regions which are obscured at UV and optical wavelengths, these galaxies are consistent with the well known correlation between the UV slope {beta} and the ratio of far infrared flux to ultraviolet flux at 1600 Angstroms. Because the UV and IR fluxes are decoupled, this observation implies that a simple foreground screen model, where UV photons from hot stars are reprocessed into the infrared by local dust, is not the proper interpretation for why these galaxies follow the beta relation. We propose to investigate the underlying mechanisms responsible for this observed correlation in these UV bright galaxies, and explore the implication for high redshift starbursts.
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