Oral Presentation

Environmental effects in protocluster galaxies at the cosmic noon

Author(s): Jose Manuel Perez-Martinez, Tadayuki Kodama, and the Mahalo-Subaru team

Presenter: Jose Manuel Perez-martinez (Tohoku University)

We use near-IR spectroscopy with MOSFIRE to investigate the role of the environment in the evolution of the gas properties of galaxies in the protocluster USS1558-003 at z=2.53. Based on rest-frame optical emission lines, [NII]λ6584 and Hα, we measure star-formation rates (SFR), gas-phase oxygen abundances, and gas velocity dispersion of protocluster members. Our results show that galaxies embedded in this structure display on average higher SFRs and metallicity values compared to their field counterparts at similar redshift, while our kinematic analysis yielded relatively low gas velocity dispersion (less than 100 km/s) for most galaxies. We discuss the implications of these results on different scenarios of environmentally driven galaxy evolution during the early stages of cluster assembly.