(Proposal ID) S12A-050

(PI) Kajisawa, Masaru

(Proposal Title)
FMOS follow-up survey of bright MIPS 24um sources in COSMOS

(Abstract)
It has been found that IR-bright galaxies significantly contribute to the 
cosmic star formation rate (SFR) density at z>~1, when most of stars in the 
present universe had been formed. It is important to investigate the evolution 
of physical properties of such IR-bright galaxies at 1 <~ z <~ 2 in order to 
understand where and how stars had been formed in the universe. We here 
propose FMOS follow-up observations of ~ 1200 Spitzer/MIPS 24mu m sources with 
f_24mu m >300mu Jy and I>22.5 in the COSMOS 2 square degree field in order to 
determine their redshifts from the rest-frame optical emission lines. These 
(optically-faint) bright 24mu m sources are expected to be IR-bright galaxies 
at z~ 0.8--2. Using the obtained spectroscopic redshifts, we are able to 1) 
derive SFRs of these galaxies precisely with the stacking analysis of MIPS 
70mu m, 160mu m, VLA and Herschel PACS/SPIRE data, 2) measure the number 
density evolution of these IR-bright galaxies with high accuracy, 3) 
investigate their spatial clustering strength and close environment and reveal 
the contributions to the cosmic SFR density from the different environments, 
and 4) study the evolution of physical properties of these galaxies such as 
dust extinction and gas metallicity with the observed rest-optical emission 
lines.