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S18B0026abst

S18B0026

This is a re-submission of our previous programs (S16B and S17B) which were 70% lost for bad weather. We request 2.5 nights to complete it. Narrow-band HΞ± and [Oiii] imaging is a powerful method to construct a complete (in SFR) and relatively un-biased sample of star forming (SF) galaxies at high redshifts (z=2.5–3.6). In our ultra-deep HΞ± imaging of proto-clusters at z=2.2 and 2.5 (S15A-047; Mahalo Deep Cluster), we obtained an intriguing result that the SF activity in low-mass galaxies (∼109MβŠ™) show a large fraction of elevated SF activities with respect to the main sequence. To verify whether this is due to some environmental effects acting on satellite galaxies or it is a common feature of low-mass SF galaxies in general, we here propose a comparably deep NB imaging (8hrs integration) on three major fields (SXDF, GOODS-S and COSMOS) with MOIRCS. Our fields will fully cover the areas of deepest and largest contiguous ALMA Deep Field in GOODS-S and SXDF (Kohno et al.), 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 SF galaxies at all masses (e.g. morphologies and ISM mass) out to z=3.6.

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