Galaxies spread across a wide range of densities in the Universe, from the crowded cores of galaxy clusters to filaments and galaxy voids. However, the explicit role of the geometry of the cosmic web in the formation and evolution of galaxies remains relatively unexplored, especially at high redshift. To achieve a better understanding of the role cosmic web play in shaping the star formation history, our scientific approach involves conducting a narrow-band NB926 imaging in COSMOS’ UltraDeep field. The triple NB filters (NB527/NB921/NB926) can trace specific emission lines at different redshifts, enabling the determination of redshifts and mapping of large-scale structure. We aim to use the slightly different transmission curves of NB921 and NB926 to determine the redshift of individual galaxies and map out galaxies at z∼ 0.4, 0.8, and 1.5 in 3D over the entire COSMOS UltraDeep field. We also aim to investigate the rise and fall of galaxies across the star-forming main sequence by comparing the Hα/[OII] flux ratio at z∼0.4. By utilizing the available optical and NIR data, we aim to achieve our scientific goals such as mapping the 3D structures, determine the redshifts, identifying galaxies located in different environments, investigating the environmental effects acting on galaxies.
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