We propose to conduct spectroscopic observations of galaxies in two structures in the DEEP2-3 field: an overdense region and a filamentary cosmic web structure. We will utilize the MOIRCS spectrograph in MOS mode. By obtaining redshifts and physical properties of galaxies in these structures, we aim to confirm the presence of large-scale structure in the DEEP2-3 field and study how galaxy evolution depends on environment. In particular, we will investigate how the accretion of galaxies onto larger structures influences their evolution. Do galaxies that are just falling into overdensities or filaments for the first time show different properties than those that have been in such structures for longer? We will also study metallicity and ionization of galaxies in the two structures, which can reveal the effects of ’preprocessing’ - physical processes that galaxies undergo even before they fall into denser environments. A comparison of the two structures will show how the prevalence and impact of preprocessing depends on environment density. This study will provide insights into how large-scale structure shapes galaxy evolution. By focusing on the ionization and chemical properties of galaxies, we can uncover some of the key mechanisms by which this growth occurs.
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