J/ApJ/886/48ivo://CDS.VizieR/J/ApJ/886/48doi:10.26093/cds/vizier.18860048CDSAn F.X.Simpson J.M.Smail I.Swinbank A.M.Ma C.Liu D.Lang P.,Schinnerer E.Karim A.Magnelli B.Leslie S.Bertoldi F.Chen C.-C.,Geach J.E.Matsuda Y.Stach S.M.Wardlow J.L.Gullberg B.Ivison R.J.,Ao Y.Coogan R.T.Thomson A.P.Chapman S.C.Wang R.Wang W.-H.,Yang Y.Asquith R.Bourne N.Coppin K.Hine N.K.Ho L.C.Hwang H.S.,Kato Y.Lacaille K.Lewis A.J.R.Oteo I.Scholtz J.Sawicki M.,Smith D.2021-07-05T11:40:58Z2021-04-30T12:21:02ZCDS support team

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

cds-question@unistra.frmillimeter-astronomysubmillimeter-astronomyradio-galaxiesastronomical-object-identificationinfrared-sourcesredshiftedWe identify multi-wavelength counterparts to 1147 submillimeter sources from the S2COSMOS SCUBA-2 survey of the COSMOS field by employing a recently developed radio+machine-learning method trained on a large sample of Atacama Large Millimeter/submillimeter Array (ALMA)-identified submillimeter galaxies (SMGs), including 260 SMGs identified in the AS2COSMOS pilot survey. In total, we identify 1222 optical/near-infrared (NIR)/radio counterparts to the 897 S2COSMOS submillimeter sources with S_850_>1.6mJy, yielding an overall identification rate of (78+/-9)%. We find that (22+/-5)% of S2COSMOS sources have multiple identified counterparts. We estimate that roughly 27% of these multiple counterparts within the same SCUBA-2 error circles very likely arise from physically associated galaxies rather than line-of-sight projections by chance. The photometric redshift of our radio+machine-learning-identified SMGs ranges from z=0.2 to 5.7 and peaks at z=2.3+/-0.1. The AGN fraction of our sample is (19+/-4)%, which is consistent with that of ALMA SMGs in the literature. Comparing with radio/NIR-detected field galaxy population in the COSMOS field, our radio+machine-learning-identified counterparts of SMGs have the highest star formation rates and stellar masses. These characteristics suggest that our identified counterparts of S2COSMOS sources are a representative sample of SMGs at z<~3. We employ our machine-learning technique to the whole COSMOS field and identified 6877 potential SMGs, most of which are expected to have submillimeter emission fainter than the confusion limit of our S2COSMOS surveys (S_850um_<~1.5mJy). We study the clustering properties of SMGs based on this statistically large sample, finding that they reside in high-mass dark matter halos ((1.2+/-0.3)x10^13^h^-1^M_{sun}_), which suggests that SMGs may be the progenitors of massive ellipticals we see in the local universe.2019ApJ...886...48Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/886/48CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/298 : AKARI/FIS All-Sky Survey Point Source Catalogues (ISAS/JAXA, 2010)J/MNRAS/238/1171 : Optical/IR obs. of Radio Galaxies and QSOs (Dunlop+, 1989)J/ApJ/622/772 : Redshift survey of submillimeter galaxies (Chapman+, 2005)J/MNRAS/372/1621 : SCUBA Half-Degree Extragalactic Survey. II (Coppin+, 2006)J/ApJS/172/29 : XMM-Newton survey in COSMOS field. I. (Hasinger+, 2007)J/MNRAS/380/199 : SCUBA Half-Degree Extragalactic Survey. III (Ivison+, 2007)J/ApJ/707/1201 : LABOCA ECDFS Submillimeter Survey (LESS) (Weiss+, 2009)J/ApJ/716/348 : The XMM-Newton survey of the COSMOS field (Brusa+, 2010)J/ApJS/188/384 : The VLA-COSMOS survey. IV. (Schinnerer+, 2010)J/MNRAS/411/373 : Catalog of AKARI Deep Field South (Clements+, 2011)J/A+A/532/A90 : PACS Evolutionary Probe (PEP-DR1) catalogs (Lutz+, 2011)J/MNRAS/415/3831 : AzTEC/ASTE source catalogue (Aretxaga+, 2011)J/MNRAS/426/1845 : AzTEC survey of the SHADES fields. II. (Michalowski+, 2012)J/ApJ/768/91 : ALMA observations of LESS submm galaxies (Hodge+, 2013)J/A+A/556/A55 : Multi-color phot. of star-forming galaxies (Ilbert+, 2013)J/ApJ/777/18 : Stellar mass functions of galaxies to z=4 (Muzzin+, 2013)J/ApJ/788/125 : ALMA survey of ECDFS submillimeter galaxies (Simpson+, 2014)J/MNRAS/442/577 : Selected ALESS submm gal. radio properties (Thomson+, 2014)J/ApJ/817/34 : C-COSMOS Legacy multiwavelength cat. (Marchesi+, 2016)J/ApJS/222/1 : Faint ALMA 1.2mm sources down to ~0.02mJy (Fujimoto+, 2016)J/ApJ/819/62 : The COSMOS-Legacy Survey (CLS) catalog (Civano+, 2016)J/ApJ/820/82 : S2CLS: multiwavelength counterparts to SMGs (Chen+, 2016)J/ApJS/224/24 : The COSMOS2015 catalog (Laigle+, 2016)J/MNRAS/465/1789 : SCUBA-2 Cosmology Legacy Survey (Geach+, 2017)J/ApJ/837/139 : SUPER GOODS. I. Ultradeep SCUBA-2 survey (Cowie+, 2017)J/ApJ/839/58 : ALMA submm galaxies multi-wavelength data (Simpson+, 2017)J/ApJ/840/78 : Redshift survey of ALMA SMGs in ECDFS (Danielson+, 2017)J/A+A/602/A1 : VLA-COSMOS 3 GHz Large Project (Smolcic+, 2017)J/A+A/602/A2 : VLA-COSMOS 3 GHz Large Project. II. (Smolcic+, 2017)J/ApJ/853/172 : "Super-deblended" dust emission in galaxies. I. (Liu+, 2018)J/ApJ/880/43 : S2COSMOS: SCUBA-2 submm sources in COSMOS (Simpson+, 2019)J/ApJS/244/40 : A3COSMOS. I. ALMA continuum photometry catalogs (Liu+, 2019)http://sites.google.com/view/a3cosmos : A3COSMOS home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/886/48https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/886/48http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/886/48https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/886/48https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/886/48http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/886/48GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/886/48/table2 (Radio+machine-learning identified counterparts to S2COSMOS sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/886/48/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/886/48/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/886/48/table2?GETtext/xml+votable180.050000true150.033532.436551940.0055555555555555565/6814 6/27245 27247 27344https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/886/48?format=asciiInfraredMillimeterRadiodefaultJ/ApJ/886/48/table2Radio+machine-learning identified counterparts to S2COSMOS sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintS2COS850Short ID of S2COSMOS source from Simpson+ 2009, J/ApJ/880/43meta.id;meta.mainintRAJ2000[149.3/150.9] Right ascension of S2COSMOS source (J2000)degpos.eq.ra;meta.mainDEJ2000[1.5/3] Declination of S2COSMOS source (J2000)degpos.eq.dec;meta.mainRANdeg? RA of the NIR counterpart (J2000)degpos.eq.ranullableDENdeg? DEC of the NIR counterpart (J2000)degpos.eq.decnullableCl-XGB? Classification by machine-learning (1)meta.code.classintnullableRARdeg? RA of the radio counterpart (J2000)degpos.eq.ranullableDERdeg? DEC of the radio counterpart (J2000)degpos.eq.decnullableCl-RadClassification by radio identification (2)meta.code.classintzphot[0/5.6]? Photometric redshift from COSMOS2015 catalog (Laigle+, 2016, J/ApJS/224/24)src.redshiftdoublenullableCOSMOS2015Display data from COSMOS2015 (Laigle+, 2016, J/ApJS/224/24) within 1" of NIR positionmeta.ref.urlcharCOSMOSVLADisplay the VLA-COSMOS 3GHz data (Smolcic+, 2017, J/A+A/602/A1) within 1" of radio positionmeta.ref.urlchar