JADES data release 4 – Paperi. Sample selection, observing strategy and redshifts of the complete spectroscopic sample

Curtis-Lake, E, Cameron, AJ, Bunker, AJ, Scholtz, J, Carniani, S, Parlanti, E, D’Eugenio, F, Jakobsen, P, Willmer, CNA, Arribas, S, Baker, WM, Charlot, S, Chevallard, J, Circosta, C, Curti, M, Duan, Q, Eisenstein, DJ, Hainline, K, Ji, Z, Johnson, BD et al (2026) JADES data release 4 – Paperi. Sample selection, observing strategy and redshifts of the complete spectroscopic sample. Monthly Notices of the Royal Astronomical Society, 549 (4). ISSN 0035-8711

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Abstract

This paper accompanies Data Release 4 of the James Webb Space Telescope (JWST) Advanced Deep Extragalactic Survey, which presents the full NIRSpec spectroscopy of the survey. We provide spectra of 5190 targets across Great Observatories Origins Deep Survey (GOODS)-North and GOODS-South (including the Hubble Ultra Deep Field), observed with the low-dispersion ((Formula presented) –300) prism and three medium-resolution ((Formula presented) ) gratings spanning (Formula presented) m; 2654 were also observed with the higher resolution ((Formula presented) ) G395H grating. The tiered survey design obtained (Formula presented) h exposures for (Formula presented) galaxies in the Deep and Ultra Deep tiers, and shallower observations ((Formula presented) –3 h per setting) of (Formula presented) galaxies in the Medium tiers. Targets were selected from photometric redshifts or colours, with priority given to rest-UV-selected galaxies at (Formula presented) and F444W-selected galaxies at (Formula presented). We describe the full target selection and present spectroscopic redshifts and success rates. In total, we obtain robust redshifts for 3297 galaxies, including 396 at (Formula presented) and 2545 at (Formula presented). To facilitate uniform analyses, we define ‘gold’ subsamples based on UV- and F444W-selection. Using the parent samples and redshift success rates, we construct rest-UV luminosity functions at (Formula presented) from the Medium- and Deep-JWST tiers. Our number densities agree well with previous determinations from both photometric and spectroscopic samples, with modest interloper fractions confirming the reliability of photometric UV-bright galaxy selections at these redshifts.

Item Type:	Article
Uncontrolled Keywords:	5109 Space Sciences; 51 Physical Sciences; 5109 Space Sciences; 51 Physical Sciences; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics; 5101 Astronomical sciences; 5107 Particle and high energy physics; 5109 Space sciences
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	Oxford University Press
Date of acceptance:	20 February 2026
Date of first compliant Open Access:	15 September 2026
Date Deposited:	15 Sep 2026 10:35
Last Modified:	15 Sep 2026 10:35
DOI or ID number:	10.1093/mnras/stag836
URI:	https://researchonline.ljmu.ac.uk/id/eprint/29428

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