Physics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11183m&link_type=abstract
HST Proposal ID #11183. Cycle 16
Physics
Scientific paper
We propose to carry out deep NICMOS/NIC2 imaging in the rest-frame, ultraviolet continuum of galaxies discovered in the Magellan Multi-Slit Lyman Alpha Survey. This spectroscopic survey identified ultra-faint, redshift 5.7 Lyman-alpha emitters LAEs in a 15 nm wide, OH-free band at 819 nm. Imaging with HST is the only way to measure their continuum intensity near rest-frame 160 nm. The ultraviolet photometry will directly measure the rate of star formation in common objects; and, when combined with groundbased Lyman-alpha luminosities, provide a reliable cross-calibration of Lyman-alpha attenuation and emission equivalent width. Direct measurement of the size of the star-forming regions, unresolved in the groundbased data, will extend measurements of the intensity of star formation to common objects in the high-redshift universe. Gaseous outflows from these galaxies are thought to be the source of their asymmetric line profiles, and area-averaged star formation rates are needed to calibrate feedback recipes, as well as eventually extend the Schmidt-Kennicutt law to high-redshift. The three targets proposed in Cycle~16 lie in fields covered by major galaxy surveys, are not as bright as the unusually luminous sources identified by such surveys at high-redshift, and present an opportunity to study properties of more common galaxies at high-redshift.;
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