Mapping the large-scale structure of the intergalactic medium (IGM) and the spatial correlation with galaxies and active galactic nuclei (AGN) are instrumental to understanding how they drove reionization. We propose a novel photometric approach to perform 2D IGM tomography across z∼3−6 in the COSMOS field using ultra-deep Subaru HSC narrow-band imaging, whereby measuring the evolving impacts of leaked Lyman continuum (LyC) radiation from galaxies on the ionization state of the IGM using cross-correlation between Lyα emitters (LAEs) and Lyα forest transmission. In this proposal, we request Keck DEIMOS spectroscopy to locate bright background galaxies suitable for IGM tomography, targeting the photometric candidates from a new COSMOS2020 catalog. Our COSMOGRAPHY survey directly visualizes the spatial correlations between LAEs and the large-scale IGM using the reconstructed 2D tomographic maps at the same volumes. The multiple HSC narrow-band filters available in the COSMOS field allow us to simultaneously characterize the LyC leakage and the CIV and HeII emission line properties of the LAEs, providing a panchromatic view of early galaxies and the cosmic web with 2D IGM tomography from the tail end of reionization to cosmic noon.
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