Oral Presentation

Environmental dependence of star-forming galaxies at z~0.4 in the DEEP2-3 Field.

Author(s): Ronaldo Laishram

Presenter: Ronaldo Laishram (Tohoku University)

Galaxies are distributed inhomogeneously on small scales in the Universe and thus define large-scale structures (LSS). Understanding the evolution of cluster galaxies is to determine how galaxies change their properties as a result of the hierarchical growth of LSS. This work studies the environmental dependence of narrow-band (NB) selected star-forming galaxies at z~0.4 in the DEEP2-3 field. We demonstrate a method to estimate accurate redshifts of star-forming galaxies by measuring the flux ratio of the same emission line observed through two adjacent narrow-band filters taken with Hyper Suprime-Cam (HSC) on the Subaru Telescope. We also study the environmental dependence of star-forming activity, measure Hα and stellar continuum sizes, and explore the 3-D structure of the cosmic web at z=0.4 using HSC triple NB imaging. Additionally, we investigate the relationship between the [OII]λ3727/Hα flux ratios of emission line galaxies and their physical parameters, as well as measure dust extinction and metallicity using the flux ratio.