A Protocluster of Massive Quiescent Galaxies at z = 4
A Protocluster of Massive Quiescent Galaxies at z = 4
Abstract We report on discovery of a concentration of massive quiescent galaxies located at z = 4. The concentration is first identified using high-quality photometric redshifts based on deep, multiband data in Subaru/XMM-Newton Deep Field. Follow-up near-infrared spectroscopic observations with MOSFIRE on Keck confirm a massive (∼10 11 M ⊙ …