Hanwen Sun, Tao Wang, Ke Xu, D. Elbaz, E. Merlin, Cheng Cheng, E. Daddi, Shuowen Jin, Wei-Hao Wang, Longyue Chen, A. Fontana, Zhen-Kai Gao, J Huang, B. Magnelli, Valentina Sangalli, Yue Wang, Tiancheng Yang, Yuheng Zhang, Luwenjia Zhou
Abstract Our understanding of the early Universe has long been limited by biased galaxy samples selected through various color criteria. With deep JWST infrared imaging, mass-complete galaxy samples can now be studied up to z ∼ 8 for the first time. However, recent work has revealed systematic uncertainties in measuring the physical properties of galaxies based solely on JWST/NIRCam and Hubble Space Telescope (HST) photometry, due to their limited wavelength coverage. This highlights the need for supplementary data, particularly in the rest-frame UV and near-infrared. Here we present the ULTIMATE-deblending project, which will eventually deliver self-consistent UV to radio photometry for galaxies detected in deep JWST surveys, including both NIRCam and MIRI data. In this first paper, we release a 50-band photometric catalog spanning CFHT U to JWST/MIRI F1800W, covering a total of 627.1 arcmin 2 across two JWST/PRIMER fields. We detail the reduction of the JWST imaging data, the photometric procedures, and the spectral-energy-distribution-fitting methodology used to derive the galaxy properties. Compared with photometry including only HST and JWST bands, the inclusion of deblended low-resolution photometry from ground-based telescopes improves the accuracy of photometric redshifts by ∼40%, while reducing the outlier fraction by ∼60%. This galaxy sample can serve as a key reference for statistical studies of galaxy formation and evolution in the early Universe. All catalogs and JWST mosaics from the ULTIMATE-deblending project have been made publicly available.