J/ApJ/820/82ivo://CDS.VizieR/J/ApJ/820/82doi:10.26093/cds/vizier.18200082CDSChen C.-C.Smail I.Ivison R.J.Arumugam V.Almaini O.Conselice C.J.,Geach J.E.Hartley W.G.Ma C.-J.Mortlock A.Simpson C.Simpson J.M.,Swinbank A.M.Aretxaga I.Blain A.Chapman S.C.Dunlop J.S.Farrah D.,Halpern M.Michalowski M.J.van der Werf P.Wilkinson A.Zavala J.A.2017-01-23T22:00:00Z2016-07-04T10:01:05ZCDS support team

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

cds-question@unistra.frgalaxiesphotometrymillimeter-astronomysubmillimeter-astronomyradio-sourcesinfrared-sourcesredshiftedsurveysWe present multiwavelength identifications for the counterparts of 1088 submillimeter sources detected at 850{mu}m in the SCUBA-2 Cosmology Legacy Survey (S2CLS) study of the UKIRT Infrared Deep Sky Survey-Ultra-Deep Survey (UDS) field. By utilizing an Atacama Large Millimeter Array (ALMA) pilot study on a subset of our bright SCUBA-2 sample as a training set, along with the deep optical-near-infrared (OIR) data available in this field, we develop a novel technique, Optical-IR Triple Color (OIRTC), using z-K, K-[3.6], [3.6]-[4.5] colors to select the candidate submillimeter galaxy (SMG) counterparts. By combining radio identification and the OIRTC technique, we find counterpart candidates for 80% of the Class = 1 >=4{sigma} SCUBA-2 sample, defined as those that are covered by both radio and OIR imaging and the base sample for our scientific analyses. Based on the ALMA training set, we expect the accuracy of these identifications to be 82%+/-20%, with a completeness of 69%+/-16%, essentially as accurate as the traditional p-value technique but with higher completeness. We find that the fraction of SCUBA-2 sources having candidate counterparts is lower for fainter 850{mu}m sources, and we argue that for follow-up observations sensitive to SMGs with S_850_>~1mJy across the whole ALMA beam, the fraction with multiple counterparts is likely to be >40% for SCUBA-2 sources at S_850_>~4mJy. We find that the photometric redshift distribution for the SMGs is well fit by a lognormal distribution, with a median redshift of z=2.3+/-0.1. After accounting for the sources without any radio and/or OIRTC counterpart, we estimate the median redshift to be z=2.6+/-0.1 for SMGs with S_850_>1mJy. We also use this new large sample to study the clustering of SMGs and the far-infrared properties of the unidentified submillimeter sources by stacking their Herschel SPIRE far-infrared emission.2016ApJ...820...82Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/820/82CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)J/ApJ/812/43 : ALMA 870um obs. of HerMES galaxies (Bussmann+, 2015)J/MNRAS/442/577 : Selected ALESS SMGs radio properties (Thomson+, 2014)J/MNRAS/440/3462 : AzTEC/ASTE 1.1mm survey of SSA22 (Umehata+, 2014)J/MNRAS/436/1919 : SCUBA observations of COSMOS galaxies (Casey+, 2013)J/MNRAS/431/194 : Selecting IRAC counterparts to SMGs (Alberts+, 2013)J/ApJ/768/91 : ALMA observations of LESS submm galaxies (Hodge+, 2013)J/MNRAS/426/1845 : AzTEC survey of the SHADES fields. II. (Michalowski+, 2012)J/MNRAS/421/3060 : Subaru/XMM Deep Field radio imaging. III. (Simpson+, 2012)J/MNRAS/415/1479 : LESS photometric redshift survey (Wardlow+, 2011)J/MNRAS/413/2314 : Radio & mid-IR counterpart of submm galaxies (Biggs+, 2011)J/MNRAS/405/2260 : GOODS-S field AzTEC/ASTE Deep 1.1mm imaging (Scott+, 2010)J/ApJ/707/1201 : LABOCA ECDFS Submillimeter Survey (LESS) (Weiss+, 2009)J/ApJS/179/124 : Subaru/XMM-Newton deep survey (SXDS) III. (Ueda+, 2008)J/ApJS/179/95 : VLA survey of CDF-S. II. (Mainieri+, 2008)J/MNRAS/380/199 : SCUBA Half-Degree Extragalactic Survey. III (Ivison+, 2007)J/MNRAS/372/741 : SXDF 100{mu}Jy catalogue (Simpson+, 2006)J/ApJ/622/772 : Redshift survey of submillimeter galaxies (Chapman+, 2005)J/ApJ/606/664 : MAMBO sources near NTT Deep Field (Dannerbauer+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/820/82https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/820/82http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/820/82https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/820/82https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/820/82http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/820/82GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/820/82/table3 (*Candidate submillimeter galaxy (SMG) counterparts of the main SCUBA-2 sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/820/82/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/820/82/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/820/82/table3?GETtext/xml+votable180.050000true34.62821-5.525220.005555555555555556Cone search capability for table J/ApJ/820/82/table4 (*Candidate submillimeter galaxy (SMG) counterparts of the supplementary SCUBA-2 sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/820/82/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/820/82/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/820/82/table4?GETtext/xml+votable180.050000true34.65998-5.360770.0055555555555555566/17677 17679 17688 17690https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/820/82?format=asciiRadioInfraredOpticaldefaultJ/ApJ/820/82/table3*Candidate submillimeter galaxy (SMG) counterparts of the main SCUBA-2 sourcesClass[1/3] Class (1)src.classintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDShort S2CLS identifier (UDS.NNNN)meta.id;meta.maincharRAJ2000SMG Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000SMG Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainN[0/5] Number of counterpart candidatesmeta.numberintCCIDCounterpart candidate identifier (IDN)meta.idcharf_CCID[*] Flag on CCID (2)meta.codecharRARdeg? Radio Right Ascension (J2000)degpos.eq.ranullableDERdeg? Radio Declination (J2000)degpos.eq.decnullableRAKdeg? UKIDSS K-band Right Ascension (J2000)degpos.eq.ranullableDEKdeg? UKIDSS K-band Declination (J2000)degpos.eq.decnullablez[0.2/6.5]? Photometric redshiftsrc.redshift.photfloatnullableE_z[0.01/2.6]? Upper uncertainty in zstat.error;stat.maxfloatnullablee_z[0.01/1.9]? Lower uncertainty in zstat.error;src.redshiftfloatnullablep[0/0.11]? The p-value for radio selected counterpartsstat.fit.goodnessfloatnullable<f>[0.05/0.5]? Mean submillimeter galaxy (SMG) fraction (f_i,OIRTC_=N_i,SMG_/N_i_) (3)statfloatnullableJ/ApJ/820/82/table4*Candidate submillimeter galaxy (SMG) counterparts of the supplementary SCUBA-2 sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDShort S2CLS identifier (UDS.NNNN)meta.id;meta.maincharRAJ2000SMG Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000SMG Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainClass[1/3] Class (1)src.classintN[0/5] Number of counterpart candidatesmeta.numberintCCIDCounterpart candidate identifier (IDN)meta.idcharf_CCID[*] Flag on CCID (2)meta.codecharRARdeg? Radio Right Ascension (J2000)degpos.eq.ranullableDERdeg? Radio Declination (J2000)degpos.eq.decnullableRAKdeg? UKIDSS K-band Right Ascension (J2000)degpos.eq.ranullableDEKdeg? UKIDSS K-band Declination (J2000)degpos.eq.decnullablez[0.2/6.5]? Photometric redshiftsrc.redshift.photfloatnullableE_z[0.01/2.6]? Upper uncertainty in zstat.error;stat.maxfloatnullablee_z[0.01/1.9]? Lower uncertainty in zstat.error;src.redshiftfloatnullablep[0/0.11]? The p-value for radio selected counterpartsstat.fit.goodnessfloatnullable<f>[0.05/0.5]? Mean submillimeter galaxy (SMG) fraction (f_i,OIRTC_=N_i,SMG_/N_i_) (3)statfloatnullable