J/ApJS/277/41ivo://CDS.VizieR/J/ApJS/277/41doi:10.26093/cds/vizier/bb-8n-19CDSKim T.Sohn J.Hwang Ho S.Ho S.C.-C.Burgarella D.Goto T.,Hashimoto T.Jeong W.-S.Kim S.J.Malkan M.A.Miyaji T.Oi N.,Shim H.Song H.Hwang N.Park B.-G.2026-08-03T07:26:17Z2026-02-16T11:14:52ZCDS support team

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

cds-question@unistra.frgalaxiesinfrared-sourcesredshiftedphotometryvisible-astronomyspectroscopyWe perform an MMT/Hectospec redshift survey of the North Ecliptic Pole Wide (NEPW) field covering 5.4deg^2^ and use it to estimate the photometric redshifts for the sources without spectroscopic redshifts. By combining 2572 newly measured redshifts from our survey with existing data from the literature, we create a large sample of 4421 galaxies with spectroscopic redshifts in the NEPW field. Using this sample, we estimate photometric redshifts of 77,755 sources in the band-merged catalog of the NEPW field with a random forest model. The estimated photometric redshifts are generally consistent with the spectroscopic redshifts, with a dispersion of 0.028, an outlier fraction of 7.3%, and a bias of -0.01. We find that the standard deviation of the prediction from each decision tree in the random forest model can be used to infer the fraction of catastrophic outliers and the measurement uncertainties. We test various combinations of input observables, including colors and magnitude uncertainties, and find that the details of these various combinations do not change the prediction accuracy much. As a result, we provide a catalog of 77,755 sources in the NEPW field, which includes both spectroscopic and photometric redshifts up to z~2.2025ApJS..277...41Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/277/41CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)J/ApJS/172/583 : NEP source catalog (Hwang+, 2007)J/ApJS/190/166 : Optical catalog of AKARI NEP-wide survey (Jeon+, 2010)J/A+A/514/A5 : PAH luminous galaxies at z~1 (Takagi+, 2010)J/A+A/548/A29 : IR source catalog of AKARI NEP-Wide field (Kim+, 2012)J/ApJS/207/37 : IR sources spectroscopy in the AKARI NEP (Shim+, 2013)J/ApJS/214/20 : AKARI NEP field J- and H- band source catalog (Jeon+, 2014)J/A+A/566/A60 : Optical-NIR catalog of AKARI NEP Deep Field (Oi+, 2014)J/MNRAS/446/911 : X-ray sources in the AKARI NEP deep field (Krumpe+, 2015)J/ApJS/224/24 : The COSMOS2015 catalog (Laigle+, 2016)J/ApJS/234/38 : Spitzer/IRAC obs. of the NEP (Nayyeri+, 2018)J/A+A/641/A129 : Multi-band photometry catalog of 185 DSFGs (Barrufet+, 2020)J/MNRAS/498/609 : AKARI North Ecliptic Pole field in u-band (Huang+, 2020)J/MNRAS/500/4078 : Band-merged catalogue of AKARI infrared sources (Kim+, 2021)J/A+A/651/A108 : AGN cat. from the AKARI NEP Wide field (Poliszczuk+, 2021)J/A+A/651/A55 : Predicted redshifts of galaxies with NetZ (Schuldt+, 2021)J/ApJ/945/94 : HectoMAP: the complete redshift survey (DR2) (Sohn+, 2023)J/A+A/689/A83 : Chandra source identifications in AKARI NEPD (Miyaji+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/277/41https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/277/41http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/277/41https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/277/41https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/277/41http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/277/41GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/277/41/table3 (Redshifts in the NEPW field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/277/41/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/277/41/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/277/41/table3?GETtext/xml+votable180.050000true270.6981566.877970.0055555555555555565/2901 4010 6/10237 10239 11613 15358-15359 16044 16046https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/277/41?format=asciiOpticalInfrareddefaultJ/ApJS/277/41/table3Redshifts in the NEPW fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[2/135155] Identifier (1)meta.id;meta.mainintRAJ2000[266.6/273.5] Right Ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000[65.2/67.8] Declination (J2000)degpos.eq.dec;meta.mainindexedrmag[14.47/]? Apparent r-band magnitudemagphot.mag;em.opt.Rfloatnullablespecz[-0.013/3.9]? Spectroscopic redshiftsrc.redshiftfloatnullablee_specz[0.0001/0.0007]? Uncertainty in specz (2)stat.error;src.redshiftfloatnullableSource[1/9] Source of specz (3)meta.code;src.redshiftintr-value[4.0/49.11]? r-value in specz measurement (2)stat.fit.goodnessfloatnullablephotz[0.02/1.7]? Photometric redshift measured using ML in this studysrc.redshift.photfloatnullablee_photz[0.008/0.2]? Uncertainty in photz (2)stat.error;src.redshift.photfloatnullablesigmaDT[0/0.72]? Standard deviation of the decision trees (See Section 3.4)stat.stdevfloatnullable