J/ApJ/982/51ivo://CDS.VizieR/J/ApJ/982/51CDSPrice S.H.Bezanson R.Labbe I.Furtak L.J.de Graaff A.Greene J.E.,Kokorev V.Setton D.J.Suess K.A.Brammer G.Cutler S.E.Leja J.,Pan R.Wang B.Weaver J.R.Whitaker K.E.Atek H.Burgasser A.J.,Chemerynska I.Dayal P.Feldmann R.Forster Schreiber N.M.,Fudamoto Y.Fujimoto S.Glazebrook K.Goulding A.D.Khullar G.,Kriek M.Marchesini D.Maseda M.V.Miller T.B.Muzzin A.,Nanayakkara T.Nelson E.Oesch P.A.Shipley H.Smit R.Taylor E.N.,van Dokkum P.Williams C.C.Zitrin A.2026-05-12T15:41:22Z2026-05-12T16:04:18ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxiesinfrared-astronomyspectroscopyredshiftedgalaxy-clustersWe 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 ~26arcmin2, overlapping existing Hubble Space Telescope coverage from programs including the Hubble Frontier Fields and BUFFALO. We successfully observed 553 objects down to m_F444W_~30 AB, and by leveraging mask overlaps, we reach total on-target exposure times ranging from 2.4 to 16.7hr. 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 M_SL_=(2.1+/-0.3)x10^15^M_{sun}_.2025ApJ...982...51Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/982/51CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/801/44 : HST lensing analysis of the CLASH sample (Zitrin+, 2015)J/ApJ/928/87 : Strongest cluster lenses (Fox+, 2022)J/ApJ/952/84 : GLASS-JWST ERSP. III. A2744 JWST & MUSE obs. (Bergamini+, 2023)J/A+A/670/A60 : Abell 2744 members (Bergamini+, 2023)J/ApJ/947/20 : Color-selected quiescent gal. at z>3 in JWST (Valentino+, 2023)J/ApJS/275/36 : ALMA Lensing Cluster Survey (ALCS) 1.2mm (Fujimoto+, 2024)J/ApJS/270/12 : UNCOVER SPS cat. for robust sources up to z~15 (Wang+, 2024)J/ApJS/270/7 : The UNCOVER phot. cat. of A2744 wiht HST+JWST (Weaver+, 2024)http://jwst-uncover.github.io/DR4.html : The UNCOVER & MegaScience surveyshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/982/51https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/982/51http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/982/51https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/982/51https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/982/51http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/982/51GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/982/51/table2 (Redshift catalog from UNCOVER NIRSpec/PRISM spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/982/51/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/982/51/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/982/51/table2?GETtext/xml+votable180.050000true3.59242259-30.432828580.0055555555555555566/16486https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/982/51?format=asciiInfrareddefaultJ/ApJ/982/51/table2Redshift catalog from UNCOVER NIRSpec/PRISM spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMSA[2008/60157] Object identification number for MSA design (<[PBL2025] MSA NNNNN> in Simbad) (id_msa) (1)meta.id;meta.mainintRAJ2000[3.51/3.65] Right Ascension (J2000) (ra) (1)degpos.eq.ra;meta.mainDEJ2000[-30.5/-30.3] Declination (J2000) (dec) (1)degpos.eq.dec;meta.mainzspec[0/13.17]? Spectroscopic redshift (z_spec) (2)src.redshiftfloatnullablezspec16[0.09/12.91]? 16th percentile, zspec, p(z) dist (z_spec16) (2)stat.min;src.redshiftfloatnullablezspec50[0.13/13.16]? 50th percentile, zspec, p(z) dist (z_spec50) (2)stat.mean;src.redshiftfloatnullablezspec84[0.13/13.22]? 84th percentile, zspec, p(z) dist (z_spec84) (2)stat.max;src.redshiftfloatnullableq_zspec[0/3] Redshift quality flag (3=secure) (flag_zspec_qual) (2)meta.code.qual;src.redshiftintspFl[0/1] Spectrum flag (flag_successful_spectrum) (3)meta.codeintbkgFl[0/1] Local background subtraction flag (flag_potential_local_background_issue) (4)meta.codeintelFl[0/1]? Feature flag, 2+ emission lines (flag_emission_lines) (5)meta.codeintnullablebkelFl[0/1]? Feature flag, break+emission line (flag_line_and_break) (5)meta.codeintnullablebkabsFl[0/1]? Feature flag, break+absorption (flag_break_strong_abs_features_only) (5)meta.codeintnullablebkFl[0/1]? Feature flag, break only (flag_break_only) (5)meta.codeintnullablebumpFl[0/1]? Feature flag, stellar bump only (flag_stellar_bump_only) (5)meta.codeintnullablezbestMethFit method for best-fit redshift (method_best_zfit)meta.notecharzerrMethFit method for redshift uncertainties/percentiles (method_zuncert)meta.notecharTexp[0/16.7] Total exposure time (texp_tot)htime.duration;obs.exposurefloatmasksList of masks on which each object was includedmeta.id;obscharDR3[10065/67255]? Closest match UNCOVER DR3 ID (id_DR3) (6)meta.id.crossintnullablesepDR3[0/0.24]? Separation of UNCOVER DR3 and MSA (sep_DR3) (6)arcsecpos.angDistancefloatnullableDR2Display data from Weaver+ 2024, J/ApJS/270/7 and Wang+ 2024, J/ApJS/270/12 within 0.24"meta.ref.urlintnullable