J/AJ/153/107ivo://CDS.VizieR/J/AJ/153/107doi:10.26093/cds/vizier.51530107CDSTie S.S.Martini P.Mudd D.Ostrovski F.Reed S.L.Lidman C.,Kochanek C.Davis T.M.Sharp R.Uddin S.King A.Wester W.,Tucker B.E.Tucker D.L.Buckley-Geer E.Carollo D.Childress M.,Glazebrook K.Hinton S.R.Lewis G.Macaulay E.O'Neill C.R.,Abbott T.M.C.Abdalla F.B.Annis J.Benoit-Levy A.Bertin E.,Brooks D.Carnero Rosell A.Carrasco Kind M.Carretero J.Cunha C.E.,da Costa L.N.DePoy D.L.Desai S.Doel P.Eifler T.F.Evrard A.E.,Finley D.A.Flaugher B.Fosalba P.Frieman J.Garcia-Bellido J.,Gaztanaga E.Gerdes D.W.Goldstein D.A.Gruen D.Gruendl R.A.,Gutierrez G.Honscheid K.James D.J.Kuehn K.Kuropatkin N.Lima M.,Maia M.A.G.Marshall J.L.Menanteau F.Miller C.J.Miquel R.,Nichol R.C.Nord B.Ogando R.Plazas A.A.Romer A.K.Sanchez E.,Santiago B.Scarpine V.Schubnell M.Sevilla-Noarbe I.Smith R.C.,Soares-Santos M.Sobreira F.Suchyta E.Swanson M.E.C.Tarle G.,Thomas D.Walker A.R.(The DES Collaboration)2023-01-09T14:28:41Z2018-05-03T06:37:15ZCDS support team

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

cds-question@unistra.frquasarsredshiftedinfrared-photometryvisible-astronomyWide-band photometryWe present a study of quasar selection using the supernova fields of the Dark Energy Survey (DES). We used a quasar catalog from an overlapping portion of the SDSS Stripe 82 region to quantify the completeness and efficiency of selection methods involving color, probabilistic modeling, variability, and combinations of color/probabilistic modeling with variability. In all cases, we considered only objects that appear as point sources in the DES images. We examine color selection methods based on the Wide-field Infrared Survey Explorer (WISE) (Wright et al. 2010AJ....140.1868W) mid-IR W1-W2 color, a mixture of WISE and DES colors (g-i and i-W1), and a mixture of Vista Hemisphere Survey (McMahon et al. 2013Msngr.154...35M) and DES colors (g-i and i-K). For probabilistic quasar selection, we used XDQSO, an algorithm that employs an empirical multi-wavelength flux model of quasars to assign quasar probabilities. Our variability selection uses the multi-band {chi}^2^-probability that sources are constant in the DES Year 1 griz-band light curves. The completeness and efficiency are calculated relative to an underlying sample of point sources that are detected in the required selection bands and pass our data quality and photometric error cuts. We conduct our analyses at two magnitude limits, i<19.8 mag and i<22 mag. For the subset of sources with W1 and W2 detections, the W1-W2 color or XDQSOz method combined with variability gives the highest completenesses of >85% for both i-band magnitude limits and efficiencies of >80% to the bright limit and >60% to the faint limit; however, the giW1 and giW1+variability methods give the highest quasar surface densities. The XDQSOz method and combinations of W1W2/giW1/XDQSOz with variability are among the better selection methods when both high completeness and high efficiency are desired. We also present the OzDES Quasar Catalog of 1263 spectroscopically confirmed quasars from three years of OzDES observation in the 30 deg^2^ of the DES supernova fields. The catalog includes quasars with redshifts up to z~4 and brighter than i=22 mag, although the catalog is not complete up to this magnitude limit.2017AJ....153..107Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/153/107CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/250 : The VIMOS VLT deep survey (VVDS-DEEP) (Le Fevre+ 2005)II/328 : AllWISE Data Release (Cutri+ 2013)J/MNRAS/472/273 : OzDES DR1 (Childress+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/153/107https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/153/107http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/153/107https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/153/107https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/153/107http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/153/107GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/153/107/table2 (OzDES quasar catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/153/107/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/153/107/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/153/107/table2?GETtext/xml+votable180.050000true34.76233-6.3520.0055555555555555565/4422 4436-4437 8847 8868 8983 9026 6/17669-17671 17677 17679-17680 17682-17683 17686 17692-17694 17701 17712 17735 17741 17752-17753 17756-17757 35382-35383 35385 35387 35476 35478 35480-35481 35925-35927 35931 35953 35956-35957 36098 36128-361293.830199579824256e-20 6.513807192489934e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/153/107?format=asciiOpticalInfrareddefaultJ/AJ/153/107/table2OzDES quasar catalogSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDES[3167323870/3174409350] DES identifier (1)meta.idRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainzOzDES spectroscopic redshiftsrc.redshiftdoubleiMagAbsolute i band magnitude using zmagphys.magAbsdoublegmag? Apparent DES g band AB magnitude (2) (3)magphot.mag;em.opt.Bdoublenullablee_gmag? Uncertainty in gmag (3)magstat.error;phot.magdoublenullablee_gmodUncertainty in gmodstat.errordoublef_gmag[0/3] SExtractor flag for gmagmeta.codeintrmag? Apparent DES r band AB magnitude (2) (3)magphot.mag;em.opt.Rdoublenullablee_rmag? Uncertainty in rmag (3)magstat.error;phot.magdoublenullablef_rmag[0/4] SExtractor flag for rmagmeta.codeintimagApparent DES i band AB magnitude (2)magphot.mag;em.opt.Idoublee_imagUncertainty in imagmagstat.error;phot.magdoublef_imag[0/6] SExtractor flag for imagmeta.codeintzmag? Apparent DES z band AB magnitude (2) (3)magphot.mag;em.opt.Idoublenullablee_zmag? Uncertainty in zmag (3)magstat.error;phot.magdoublenullablef_zmag[0/6] SExtractor flag for zmagmeta.codeintYmag? Apparent DES Y band AB magnitude (2) (3)magphot.mag;em.IR.Jdoublenullablee_Ymag? Uncertainty in Ymag (3)magstat.error;phot.magdoublenullablef_Ymag[0/3] SExtractor flag for Ymagmeta.codeintgmodDES spread_model from SExtractor in g band (4)instr.det.psfdoublermodDES spread_model from SExtractor in r band (4)instr.det.psfdoublee_rmodUncertainty in rmodstat.errordoubleimodDES spread_model from SExtractor in i band (4)instr.det.psfdoublee_imodUncertainty in imodstat.errordoublezmodDES spread_model from SExtractor in z band (4)instr.det.psfdoublee_zmodUncertainty in zmodstat.errordoubleYmodDES spread_model from SExtractor in Y band (4)instr.det.psfdoublee_YmodUncertainty in Ymodstat.errordoubleW1mag? WISE/W1 3.4{mu}m band Vega magnitude (3) (5)magphot.mag;em.IR.3-4umdoublenullablee_W1mag? Uncertainty in W1mag (3)magstat.error;phot.magdoublenullableW2magWISE/W2 4.6{mu}m band Vega magnitude (5)magphot.mag;em.IR.4-8umdoublee_W2mag? Uncertainty in W2mag (3)magstat.error;phot.magdoublenullableymag? VHS y band Vega magnitude (3) (6)magphot.mag;em.IR.Jdoublenullablee_ymag? Uncertainty in ymag (3)magstat.error;phot.magdoublenullableJmag? VHS J band Vega magnitude (3) (6)magphot.mag;em.IR.Jdoublenullablee_Jmag? Uncertainty in Jmag (3)magstat.error;phot.magdoublenullableHmag? VHS H band Vega magnitude (3) (6)magphot.mag;em.IR.Hdoublenullablee_Hmag? Uncertainty in Hmag (3)magstat.error;phot.magdoublenullableKsmag? VHS K_s_ band Vega magnitude (3) (6)magphot.mag;em.IR.Kdoublenullablee_Ksmag? Uncertainty in Ksmag (3)magstat.error;phot.magdoublenullableCode[0/309] OzDES selection code (7)meta.codeintIDOzDES Global Redshift Catalog identifiermeta.id;meta.mainchar