Computer Science
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20229m&link_type=abstract
Spitzer Proposal ID #20229
Computer Science
Scientific paper
The Subaru Deep Field (SDF) is the only large (770 sq arcmin) region of the sky with ultradeep optical, UV, near-IR and narrowband imaging. The latter has provided 2600 galaxies with Balmer, [OIII], [OII, or Lyalpha emission lines. Our extensive followup spectroscopy has confirmed the reliability of this method of selecting star-forming galaxies in 9 redshift windows from z=0.1 to 1.5. With a deep MIPS-24 observation we will obtain a definitive calibration of reddening-corrected star formation rates using the 3 leading indicators--UV continuum from young stars, optical emission lines from HII regions, and thermal re-radiation from warm dust. The direct comparison of 3 independent methods in the same galaxy sample will allow us to determine the role played by dust extinction, and to correct for it accurately. We wil thenl derive the cosmic evolution of star formation from a look-back time of 10 Gyrs to the present in typical galaxies, not just those in the high end of the luminosity function. With deep IRAC photometry for the same field, we will optimize our photometric redshift estimates, and determine the total stellar masses of many thousands of galaxies. These will include optical line-emitters, Lyman break galaxies, Lyman-alpha emitters and red galaxies over wide spans of redshift. We will measure where the stars form, as well as when, and determine how star formation correlates with galaxy mass as a function of cosmic time. Our field of view is large enough to overcome cosmic variance, and also to measure the clustering properties of these various groups of galaxies.
Iye Masanori
Kashikawa Nobunari
Kodama Tadayuki
Malkan Matthew
Motohara Ken-taro
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