The Hawaii Twenty Square Degree Survey (H20) is an ultradeep (AB mag < 27.5) survey combining Subaru Hyper Suprime-Cam and Spitzer Space Telescope imaging with Keck DEIMOS spectroscopy over the North Ecliptic Pole and Euclid Deep Field Fornax. These data provide synergy for high-redshift science when combined with the near-infrared imaging of the Euclid Deep Field survey and the Roman Space Telescope High Latitude Survey (HLS), enabling studies of galaxy demographics to z ~ 10 and beyond.

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... ically, the H20 survey provides immediate access to the deep optical photometry needed to deliver accurate photometric redshifts and thereby infer the physical properties of these high-z galaxies. Additionally, the Euclid Deep Field survey will begin upon the launch of Euclid in 2022 and may complete observations prior to the launch of the Roman Telescope. The combination of data provided by H20 and the Euclid Deep Field survey will provide the first insight into the final science capabilities of next generation large-scale surveys focusing on high-redshift science, such as the HLS. Moreover, overlap with the H20 footprint from the HLS (or other surveys with Roman) will facilitate studies of galaxy evolution at high-z over a cosmologically significant area otherwise unavailable until the end of the full ten year-long mission of the Legacy Survey of Space and Time, after which the full HLS area will be covered in optical bands to sufficient depth.