added guide star parameters ----- Attempting Submission 1 (Tue Jul 20 18:29:38 GMT 2010) ----- ----- Attempting Submission 2 (Mon Aug 02 12:30:33 GMT 2010) ----- Physical Properties of Spectroscopically Confirmed Galaxies at 5.7<z<7 in the Subaru Deep Field The last few years have seen a number of discoveries that provided the first glimpse of the universe at z > 6 using both space and ground−based telescopes. The Subaru Deep Field (SDF) project has been very successful in searching for high−redshift galaxies. It has spectroscopically identified more than 100 galaxies at z > 5.7 (i.e., the majority of the currently confirmed galaxies at z > 5.7 are in this field), and thus is an ideal field to study physical properties of distant galaxies. Here we propose to carry out deep IRAC imaging of SDF with 12 telescope pointings. When combined with the existing data from our previous program, the new data will cover 90% of the known SDF galaxies at z > 5.7 to a depth of 5−6 hours or 0.12 uJy (3 sigma). As joint Spitzer/HST observations, we also propose to obtain deep HST WFC3 F125W− and F160W−band images of a representative sample of galaxies. The WFC3 data provides rest−frame UV photometry to decipher the properties of young stellar populations, while the IRAC data measure the amplitude of the Balmer break and constrain the properties of mature populations. With the proposed observations we will be able to characterize the physical properties of these highest−redshift galaxies known so far, and obtain accurate information of stellar masses, ages, star formation histories, etc. This helps us to understand the earliest galaxy formation and evolution and the galaxy contribution to cosmic reionization. We will also specifically address the following questions: (1) Do Lyman alpha emitters and Lyman break galaxies represent physically two different galaxy populations at z > 6; (2) Is the Lyman alpha emission systematically suppressed at z > 6 with respect to the continuum emission, or, are we reaching the epoch of cosmic reionization; (3) Do we see any sign of abnormally young stellar population at z > 6. The data obtained through this program will have a legacy value for high−redshift studies in general.
Our observing strategy is straightforward. We will observe 20 spectroscopically-confirmed galaxies at z >= 6 in the Subaru Deep Field (13h274m, 27d30m) using five HST pointings. Each pointing will be observed in two WFC3 bands F125W and F160W, with one orbit per band. According to our existing WFC3 data, these galaxies likely span a large magnitude range of 25 < J_AB < 27, but WFC3 is able to detect the faintest one of them with one orbit integration. Therefore we request a total of 10 orbits. These galaxies were chosen so that they can be observed within five HST pointings regardless of rolling angles. We do not have any scheduling constraints or special requirements. None. None. None. COSMOLOGY 12 false 0.0 0.0 false false false false false false SUPPORTED GALAXY HIGH REDSHIFT GALAXY J_AB=25-27 J2000 13 23 46.0000 +27 24 36.00 J2000 GALAXY HIGH REDSHIFT GALAXY J_AB=25-27 J2000 13 23 46.0000 +27 24 36.00 J2000 GALAXY HIGH REDSHIFT GALAXY J_AB=25-27 J2000 13 23 46.0000 +27 24 36.00 J2000 GALAXY HIGH REDSHIFT GALAXY J_AB=25-27 J2000 13 23 46.0000 +27 24 36.00 J2000 GALAXY HIGH REDSHIFT GALAXY J_AB=25-27 J2000 13 23 46.0000 +27 24 36.00 J2000 WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 1 false The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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