DUALZ—Deep UNCOVER-ALMA Legacy High-Z Survey

Fujimoto, S, Bezanson, R, Labbe, I, Brammer, G, Price, SH, Wang, B, Weaver, JR, Fudamoto, Y, Oesch, PA, Williams, CC, Dayal, P, Feldmann, R, Greene, JE, Leja, J, Whitaker, KE, Zitrin, A, Cutler, SE, Furtak, LJ, Pan, R, Chemerynska, I et al (2025) DUALZ—Deep UNCOVER-ALMA Legacy High-Z Survey. The Astrophysical Journal Supplement Series, 278 (2). ISSN 0067-0049

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Abstract

We present the survey design and initial results of the Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 9 program of DUALZ, which aims to establish a joint ALMA and JWST public legacy field targeting the massive galaxy cluster A2744. DUALZ features a contiguous 4' X 6' ALMA 30 GHz-wide mosaic in Band 6, covering areas of μ > 2 down to a sensitivity of σ = 32.7 μJy. Through a blind search, we identified 69 dust continuum sources at a signal-to-noise ratio (SNR) ≳ 5.0 with median redshift and intrinsic 1.2 mm flux of z = 2.30 and S int 1.2mm = 0.24 mJy. Of these, 27 have been spectroscopically confirmed, leveraged by the latest NIRSpec observations, while photometric redshifts are also constrained by the comprehensive Hubble Space Telescope (HST), NIRCam, and ALMA data sets for the remaining sources. With priors, we further identify a [C ii]158 μm line emitter at z = 6.3254 ± 0.0004, confirmed by the latest NIRSpec spectroscopy. The NIRCam counterparts of the 1.2 mm continuum exhibit undisturbed morphologies, denoted either by disk or spheroid, implying the triggers for the faint millimeter emission are less catastrophic than mergers. We have identified eight HST-dark galaxies (F150W > 27 mag, F150W − F444W > 2.3) and two JWST-dark (F444W > 30 mag) galaxy candidates among the ALMA continuum sources. The former includes face-on disk galaxies, hinting that substantial dust obscuration does not always result from inclination. We also detect a marginal dust emission from an X-ray-detected galaxy at zspec = 10.07, suggesting an active coevolution of the central black hole and its host. We assess the infrared luminosity function up to z ∼ 10 and find it is consistent with predictions from galaxy formation models. To foster diverse scientific outcomes from the community, we publicly release reduced ALMA mosaic maps, cubes, and the source catalog at https://jwst-uncover.github.io/DR2.html#DUALZ.

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
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	American Astronomical Society
Date of acceptance:	21 March 2025
Date of first compliant Open Access:	3 June 2025
Date Deposited:	03 Jun 2025 15:52
Last Modified:	03 Jun 2025 16:00
DOI or ID number:	10.3847/1538-4365/adc677
URI:	https://researchonline.ljmu.ac.uk/id/eprint/26512

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