Price, SH, Bezanson, R, Labbe, I, Furtak, LJ, de Graaff, A, Greene, JE, Kokorev, V, Setton, DJ, Suess, KA, Brammer, G, Cutler, SE, Leja, J, Pan, R, Wang 王, B冰, Weaver, JR, Whitaker, KE, Atek, H, Burgasser, AJ, Chemerynska, I, Dayal, P et al, Feldmann, R, Förster Schreiber, NM, Fudamoto, Y, Fujimoto, S, Glazebrook, K, Goulding, AD, Khullar, G, Kriek, M, Marchesini, D, Maseda, MV, Miller, TB, Muzzin, A, Nanayakkara, T, Nelson, E, Oesch, PA, Shipley, H, Smit, R, Taylor, EN, Dokkum, PV, Williams, CC and Zitrin, A (2025) The UNCOVER Survey: First Release of Ultradeep JWST/NIRSpec PRISM Spectra for ∼700 Galaxies from z ∼ 0.3–13 in A2744. The Astrophysical Journal, 982 (51). pp. 1-16. ISSN 1538-4357

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Abstract

We present the design and observations of low-resolution JWST/NIRSpec PRISM spectroscopy from the Ultradeep NIRSpec and NIRCam ObserVations before the Epoch of Reionization (UNCOVER) Cycle 1 JWST Treasury program. Targets are selected using JWST/NIRCam photometry from UNCOVER and other programs, and cover a wide range of categories and redshifts to ensure the legacy value of the survey. These categories include the first galaxies at z ≳ 10, faint galaxies during the Epoch of Reionization (z ∼ 6−8), high-redshift active galactic nuclei (z ≳ 6), Population III star candidates, distant quiescent and dusty galaxies (1 ≲ z ≲ 6), and filler galaxies sampling redshift–color–magnitude space from z ∼ 0.1−13. Seven NIRSpec microshutter array masks across the extended A2744 cluster were observed, along with NIRCam parallel imaging in nine filters (F090W, F115W, F150W, F200W, F277W, F356W, F410M, F444W, and F480M) over a total area of ∼26 arcmin2, overlapping existing Hubble Space Telescope coverage from programs including the Hubble Frontier Fields and BUFFALO. We successfully observed 553 objects down to mF444W ∼ 30 AB, and by leveraging mask overlaps, we reach total on-target exposure times ranging from 2.4 to 16.7 hr. We demonstrate the success rate and distribution of the confirmed redshifts, and also highlight the rich information revealed by these ultradeep spectra for a subset of our targets. An updated lens model of A2744 is also presented, including 14 additional spectroscopic redshifts and finding a total cluster mass of MSL = (2.1 ± 0.3) × 1015 M⊙. We publicly release reduced 1D and 2D spectra for all objects observed in summer 2023 along with a spectroscopic redshift catalog and the updated lens model of the cluster (https://jwst-uncover.github.io/DR4.html).

Item Type:	Article
Uncontrolled Keywords:	0201 Astronomical and Space Sciences; 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics; 0306 Physical Chemistry (incl. Structural); 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:	American Astronomical Society
SWORD Depositor:	A Symplectic
Date Deposited:	24 Mar 2025 14:39
Last Modified:	24 Mar 2025 14:45
DOI or ID number:	10.3847/1538-4357/adaec1
URI:	https://researchonline.ljmu.ac.uk/id/eprint/25978

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