Search for Very High-z Galaxies with WFC3 Pure Parallel

Details Search for Very High-z Galaxies with WFC3 Pure Parallel Search for Very High-z Galaxies with WFC3 Pure Parallel

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11702y&link_type=abstract

HST Proposal ID #11702. Cycle 17

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Scientific paper

WFC3 will provide an unprecedented probe to the early universe beyond the current redshift frontier. Here we propose a pure parallel program using this new instrument to search for Lyman-break galaxies at 6.520deg} that last for 4 orbits and longer, resulting a total survey area of about 140 230 square arcminute. Based on our understanding of the new HST parallel observation scheduling process, we believe that the total number of long-duration pure parallel visits in Cycle 17 should be sufficient to accommodate our program. We waive all proprietary rights to our data, and will also make the enhanced data products public in a timely manner. {1} We will use both the UVIS and the IR channels, and do not need to seek optical data from elsewhere. {2} Our program will likely triple the size of the probable candidate samples at z 7 and z 8, and will complement other targeted programs aiming at the similar redshift range. {3} Being a pure parallel program, our survey will only make very limited demand on the scarce HST resources. More importantly, as the pure parallel pointings will be at random sight-lines, our program will be least affected by the bias due to the large scale structure {"cosmic variance"}. {4} We aim at the most luminous LBG population, and will address the bright-end of the luminosity function at z 8 and z 7. We will constrain the value of L* in particular, which is critical for understanding the star formation process and the stellar mass assembly history in the first few hundred million years of the universe. {5} The candidates from our survey, most of which will be the brightest ones that any surveys would be able to find, will have the best chance to be spectroscopically confirmed at the current 8-10m telescopes. {6} We will also find a large number of extremely red, old galaxies at intermediate redshifts, and the fine spatial resolution offered by the WFC3 will enable us constrain their formation history based on the study of their morphology, and hence shed light on their connection to the very early galaxies in the universe.;

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