ULTIMATE deblending I. A 50-band UV-to-MIR photometric catalog combining space- and ground-based data in the JWST/PRIMER survey

TL;DR

This paper presents a comprehensive 50-band UV-to-MIR photometric catalog from the JWST/PRIMER survey, improving galaxy property measurements and redshift accuracy through advanced deblending and data integration.

Contribution

It introduces a new self-consistent UV-to-Radio photometric catalog combining space- and ground-based data, enhancing galaxy analysis in the early universe.

Findings

Including ground-based deblended photometry improves redshift accuracy by ~40%.

The catalog covers 627.1 arcmin^2 across two JWST fields.

Publicly released UV-to-MIR data serve as a reference for galaxy evolution studies.

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 $z \sim 8$ for the first time. However, recent work has revealed systematic uncertainties in measuring physical properties of galaxies based solely on JWST/NIRCam and 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 JWST imaging data, the photometric procedures, and the SED-fitting methodology used to derive 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 $\sim$40%, while reducing the outlier fraction by $\sim$60%. This galaxy sample can serve as a key reference for statistical studies of galaxy formation and evolution in the early universe. The UV-to-MIR catalogs and JWST mosaics from the ULTIMATE-deblending project have been made publicly available.