(Proposal ID) S16B-081

(PI) Kodama, Tadayuki

(Proposal Title)
Mahalo Deep Fields: Low mass end of the star-forming main sequence at high-z

(Abstract)
Narrow-band Halpha and [O{iii}] imaging is a powerful method to construct a 
complete (in SFR) and relatively un-biased sample of star forming galaxies at 
high redshifts up to z=2.5 and 3.6, respectively. In our recent ultra-deep 
Halpha imaging of proto-clusters at z=2.2 and 2.5 (S15A-047; Mahalo Deep 
Cluster Survey), we have obtained an intriguing result that the star formation 
activity in low-mass galaxies (~10^9M_sun) show a large fraction of elevated 
star formation activities with respect to the star-forming main sequence. 
In order to verify whether this is due to some environmental effects acting 
on satellite galaxies or it is a common feature of low-mass star-forming 
galaxies in general, we here propose a comparably very deep NB imaging (8hrs 
integration) on three major general fields (SXDF, GOODS-S and COSMOS) with 
MOIRCS. Our fields will fully cover the areas of deepest and largest 
contiguous ALMA Deep Fields in GOODS-S and SXDF (Kohno et al.; Band-6), and 
also the deepest public NIR broad-band imaging and HST-CANDELS data are fully 
available in our fields. This also engages the proposed data a legacy value 
for detailed studies of the nature of representative star-forming galaxies at 
all masses (e.g. morphologies and ISM mass) all the way out to z=3.6.