Oral Presentation
Mapping the Large Scale Structure and Environmental Dependence of Star Forming and Morphology
Presenter: Ronaldo Laishram (Tohoku University)
The distribution of galaxies in the universe is inhomogeneous and represents large-scale structures (LSS) that consist of galaxy clusters, groups, and filaments connecting them. Understanding how galaxy characteristics are influenced by their environments and how they evolve over cosmic time within LSS is crucial. Utilizing dual narrow-band filters for precise redshift estimation, we investigate the environmental effects on star formation in galaxies within large-scale structures at z~0.4 and 1.5. We explore star-forming activity and the spatial distribution of Hα and continuum emission at z=0.4, probing the 3-D cosmic web. We found that star formation in cluster core galaxies is more centrally concentrated and less compared to the field sample, which may imply the influence of ram-pressure stripping. We also explore the morphological features and star formation activities of [OII] emitters in the COSMOS UltraDeep field at z ∼ 1.5 using JWST NIRCam data from the COSMOS-Web survey and Subaru Hyper Suprime-Cam. We also report the discovery of large filamentary structures traced by [OII] emitters, surrounding an extremely overdense core of ∼ 11× higher galaxy number density compared to the field average. Heightened star-forming activity was found in dense regions contrary to redshift 0.4, suggesting an environmental impact on early galaxy evolution. Future studies will further explore the chemical abundance, gas content, and kinematics of these galaxies to understand the underlying processes in this overdense structure.
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