Other
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12286y&link_type=abstract
HST Proposal ID #12286. Cycle 18
Other
Scientific paper
WFC3 has demonstrated its unprecedented power in probing the early universe. Here we propose to continue our pure parallel program with this instrument to search for LBGs at z 6-8. Our program, dubbed as the Hubble Infrared Pure Parallel Imaging Extragalactic Survey {"HIPPIES"}, will carry on the HST pure parallel legacy in the new decade. We request 205 orbits in Cycle-18, which will spread over 50 high Galactic latitude visits {|b|>20deg} that last for 3 orbits and longer, resulting a total survey area of 230 square arcmin. Combining the WFC3 pure parallel observations in Cycle-17, HIPPIES will complement other existing and forthcoming WFC3 surveys, and will make unique contributions to the study in the new redshift frontier because of the randomness of the survey fields. To make full use of the parallel opportunities, HIPPIES will also take ACS parallels to study LBGs at z 5-6. Being a pure parallel program, HIPPIES will only make very limited demand on the scarce HST resources, but will have potentially large scientific returns. As in previous cycle, we waive all proprietary data rights, and will make the enhanced data products public in a timely manner. {1} The WFC3 part of HIPPIES aims at the most luminous LBG population at z 8 and z 7. As its survey fields are random and completely uncorrelated, the number counts of the bright LBGs from HIPPIES will be least affected by the "cosmic variance", and hence we will be able to obtain the best constraint on the bright-end of the LBG luminosity function at z 8 and 7. Comparing the result from HIPPIES to the hydrodynamic simulations will test the input physics and provide insight into the nature of the early galaxies. {2} The z 7-8 candidates from HIPPIES, 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. {3} The ACS part of HIPPIES will produce a significant number of candidate LBGs at z 5 and z 6 per ACS field. Combining with the existing, suitable ACS fields in the HST archive, we will be able to utilize the random nature of the survey to quantify the cosmic variance and to measure the galaxy bias at z 5-6, and therefore the galaxy halo masses at these redshifts. {4} 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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