S19A0058

A population of massive (M>sim 1011 M) compact (re <∼ 2 kpc) passive galaxies with young stellar population (<∼ 2 Gyr) has been discovered at low redshift, z<∼0.2. These galaxies are found in the course of searching for local relic galaxies of ubiquitously compact quiescent galaxies at z≃ 2–3 whose progenitors are suggested to be compact star-forming galaxies at z>3. Since the local young compact quiescent galaxies are found to be <∼ 2 Gyrs old, their progenitors must be actively forming stars at z ≃ 0.4. Indeed, we have found candidates of such objects among Hα emitters at z=0.4 in HSC-SSP data. Here, we propose to carry out spectroscopic follow-up observations of them with the newly available IFU mode of FOCAS to capture the full spatial and spectral extent of rest-frame optical spectral features. We will investigate their stellar populations, star formation properties, physical parameters of ionized gas, stellar and gas kinematics, and close environment such as mergers and interactions. The proposed observations will provide important clues to understand not only the relationship between local massive compact quiescent galaxies with young ages and their likely progenitors at z=0.4, but also the formation and evolution of high-z compact galaxy populations.


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