Physics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12197r&link_type=abstract
HST Proposal ID #12197. Cycle 18
Physics
Scientific paper
The gravitational magnification of distant galaxies by foreground clusters has enabled the first measurement of the size-luminosity relation for HII regions at redshift z~2-5. A significant offset is seen in this relation with respect to that determined locally. This evolutionary trend has been interpreted as possible evidence for a dfferent mode of star formation in the early universe.To test this hypothesis, we propose to image a sample of 7 lensed galaxies at intermediate redshifts, z~1.0-1.5, carefully chosen so that the Halpha emission falls precisely within an appropriate narrow-band fiter with WFC3/IR. As each galaxy is magnified by a significant factor, this will enable us to resolve and measure the luminosities of ~50 individual HII regions as small as 50 pc to a star formation rate limit of 0.015 Mo/year. By tracking the size-luminosity relation over the full redshift range from 0 to 5, we can differentiate between various explanations proposed for the change in this fundamental relationship.;
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