(Proposal ID) S12A-084

(PI) Kodama, Tadayuki

(Proposal Title)
Scrutinizing biased galaxy formation with panoramic near-infrared spectroscopy

(Abstract)
We have nearly completed the imaging part of the Mahalo-Subaru project in 
which we have mapped out star-forming activities over the wide range in 
redshift (0.8--2.5) and in environment. Our unique sample of clusters and a 
blank field and the narrow-band (NB) emitters therein will serve as excellent 
laboratories to investigate the environment-dependent galaxy formation. In 
this proposal, we propose to conduct an intensive near-infrared (NIR) 
spectroscopic survey by taking the unique advantages of Subaru's two wide-
field NIR spectrographs, FMOS and MOIRCS. We will target ~1400 strong emitters 
in 7 clusters and a blank field, and detect a series of major nebular emission 
lines in order to fully characterize the properties of the NB emitters. 
Specifically, we will derive (1) cluster velocity dispersions as a proxy of 
cluster mass, (2) true star formation rates reliably corrected for dust 
extinction, (3) metallicities of inter-stellar medium, and (4) AGN 
contribution, and compare these quantities in detail as a function of 
redshift, environment and mass. In particular, we will address the following 
critical issues on galaxy formation, namely, "biased galaxy formation" and 
its "inside-out" propagation in clusters, "down-sizing" of star forming 
galaxies, and "AGN--starburst connection".