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S18A0032abst

S18A0032

Galaxy formation at z>1.5 are likely to be regulated by gas feeding (inflow), consumption (star formation), and feedback (outflow). However, these gaseous processes and their environmental dependence, are yet among the largest misteries in modern extragalactic astronomy. We propose to conduct deep NIR spectroscopy with MOSFIRE on Keck on our narrow-band selected star-forming galaxies in three proto-clusters at 1.5<z<2.5 where we have CO(2–1) or CO(3–2) line detections at Band-3 with ALMA and/or dust continuum detections at ALMA Band-6,7 and/or JCMT 850Β΅m. By combining the gaseous metallicities measured with line diagnostics of the NIR spectra, together with the molecular gas mass fractions already available directly from the submm-radio data, we will apply the first full analysis of chemical evolution of individual galaxies on the Z versus f(gas) diagram for galaxies in high density environments at high redshifts. This unique analysis, combined with sSFR and SFE, will put new strong constraints on the gas transfer processes between galaxies and the surrouding regions from which we can address the environmental effects acting on these processes for the first time in the forming progenitors of present-day cluster early-type galaxies.

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