Physics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..433r&link_type=abstract
NOAO Proposal ID #2008B-0433
Physics
Scientific paper
One of the biggest surprises from Spitzer is that majority of massive galaxies at z 2 are detected in deep 24um observations, indicating that they are rapidly forming their stars, building black holes, or both. However, the implications of these results are limited by the large uncertainties in converting the observed 24um flux to total IR luminosities and to what degree star formation or AGN activity dominate the 24um flux. We propose to use MOIRCS on Subaru to study 36 galaxies detected at 24um with photometric redshifts 2.0 < z < 2.6 and K < 19.7 mag. With the rest-frame optical spectra for our IR luminous galaxies we will measure precise redshifts, characterize the bolometric emission, derive SFRs from Halpha, look for AGN signatures, and for some galaxies, measure metallicities from [NII]/Halpha. The deep IRAC data will provide supplementary AGN identification and stellar masses. Our sample is drawn from the Extended Chandra Deep Field South and COSMOS and contains many more luminous sources than contained in GOODS. The choice of our fields will also insure that our study has a lasting legacy for studying high-redshift galaxies in IR-active stages of their evolution.
Dickinson Mark
Franx Marijn
Kriek Mariska
Labb'e Ivo
LeFloc'h Emeric
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