S22A0045
S22A0045
To probe the overall star formation activities in the “Cosmic Noon” at z∼2, we have carried out a z∼2 Hα emitter (HAE) galaxy survey in the ZFOURGE fields by Ks-band excess method, and identified a population of galaxies with high specific star formation rate (SFR) above main sequence by factor of three with stellar mass less than M⊙∼109M⊙. They are no undergoing bursty star formation, and expected to evolve into present-day low-mass ellipticals or merge onto more massive quiescent galaxies and contribute to their size evolution. We propose to carry out their deep NIR spectroscopy, covering rest-frame 0.3 to 0.8 µm simultaneously by SWIMS to cover all the rest-frame strong emission lines of [O ii], Hβ, [O iii], Hα, and [N ii]. They will enable us to extend the fundamental ionization relation (Nakajima et al. 2014) down to low-mass end and to probe the origin of gas from which they are formed, as well as to verify their accurate SFRs which is currently only estimated by Ks-band excesses. This will be the first spectroscopic sample of low-mass galaxies at z>2 and will clarify the state of this new population of possible “building-blocks” at cosmic noon.
This document was translated from LATEX by HEVEA.