Physics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sptz.prop80159s&link_type=abstract
Spitzer Proposal ID #80159
Physics
Scientific paper
We propose to obtain deep IRAC photometry for a new Halpha survey of galaxies at z~2. The selection of our galaxy sample is closely tied to a physical quantity (the instantaneous star formation rate), and complements continuum color-based selection methods that have dominated the current census of galaxies at these redshifts. Our observed SFR limits are 4, 8 and 16 Msun/yr for the ultra-deep, deep and shallow components of our survey respectively, and we expect to detect ~500 emission-line galaxies at z=2.2 in total. IRAC, which samples the rest-frame near-IR at that redshift, will provide crucial constraints on the stellar mass. The combination of the proposed IRAC observations with measurements of the recent star formation activity from our Halpha survey will enable us to determine how a range of star formation properties change as a function of stellar mass and how they evolve to the present day. More specifically, IRAC observations will allow us to explore the relation between the instantaneous SFR and stellar mass at z~2 and to determine the dominant mode of star formation at this epoch (starbursts vs. continuous SF). In addition, IRAC photometry will help produce more precise Halpha SFR measurements by improving the constraints on the shape of the underlying continuum. For each of the three tiers of our Halpha survey we require IRAC observations of matching depth (20 min, 80 min and 6 hr per pixel). Such IRAC data are available for our shallow fields (from S-COSMOS) and the ultra-deep field (from SEDS), but not for our two deep fields, the key components of the survey. For these, we propose quadrupling (in COSMOS) and doubling (in UDS) the existing observing time in order to reach the sensitivities required for the robust measurement of stellar masses of Halpha sources. Considering the location of our fields, the new observations will also have a lasting legacy value.
Dale Daniel
Lee Janice
Salim Samir
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