Computer Science
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11107h&link_type=abstract
HST Proposal ID #11107. Cycle 16
Computer Science
Scientific paper
We have used the ultraviolet all-sky imaging survey currently being conducted by the Galaxy Evolution Explorer GALEX to identify for the first time a rare population of low-redshift starbursts with properties remarkably similar to high-redshift Lyman Break Galaxies LBGs. These "compact UV luminous galaxies" UVLGs resemble LBGs in terms of size, SFR, surface brightness, mass, metallicity, kinematics, dust, and color. The UVLG sample offers the unique opportunity of investigating some very important properties of LBGs that have remained virtually inaccessible at high redshift: their morphology and the mechanism that drives their star formation. Therefore, in Cycle 15 we have imaged 7 UVLGs using ACS in order to 1 characterize their morphology and look for signs of interactions and mergers, and 2 probe their star formation histories over a variety of timescales. The images show a striking trend of small-scale mergers turning large amounts of gas into vigorous starbursts a process referred to as dissipational or "wet" merging. Here, we propose to complete our sample of 31 LBG analogs using the ACS/SBC F150LP FUV and WFPC2 F606W R filters in order to create a statistical sample to study the mechanism that triggers star formation in UVLGs and its implications for the nature of LBGs. Specifically, we will 1 study the trend between galaxy merging and SFR in UVLGs, 2 artificially redshift the FUV images to z=1-4 and compare morphologies with those in similarly sized samples of LBGs at the same rest-frame wavelenghts in e.g. GOODS, UDF, and COSMOS, 3 determine the presence and morphology of significant stellar mass in "pre-burst" stars, and 4 study their immediate environment. Together with our Spitzer IRAC+MIPS, GALEX, SDSS and radio data, the HST observations will form a unique union of data that may for the first time shed light on how the earliest major episodes of star formation in high redshift galaxies came about. This proposal was adapted from an ACS HRC+WFC proposal to meet the new Cycle 16 observing constraints, and can be carried out using the ACS/SBC and WFPC2 without compromising our original science goals.;
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