J/A+A/592/A75ivo://CDS.VizieR/J/A+A/592/A75doi:10.26093/cds/vizier.35920075CDSParaficz D.Courbin F.Tramacere A.Joseph R.Metcalf R.B.,Kneib J.-P.Dubath P.Droz D.Filleul F.Ringeisen D.Schafer C.2018-07-02T11:05:20Z2016-12-05T13:18:41ZCDS support team

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

cds-question@unistra.frsurveysgravitational-lensinggalaxiesphotometryWe present the results of a new search for galaxy-scale strong lensing systems in CFHTLS Wide. Our lens-finding technique involves a preselection of potential lens galaxies, applying simple cuts in size and magnitude. We then perform a Principal Component Analysis of the galaxy images, ensuring a clean removal of the light profile. Lensed features are searched for in the residual images using the clustering topometric algorithm DBSCAN. We find 1098 lens candidates that we inspect visually, leading to a cleaned sample of 109 new lens candidates. Using realistic image simulations we estimate the completeness of our sample and show that it is independent of source surface brightness, Einstein ring size (image separation) or lens redshift. We compare the properties of our sample to previous lens searches in CFHTLS. Including the present search, the total number of lenses found in CFHTLS amounts to 678, which corresponds to ~4 lenses per square degree down to i(AB)=24.8. This is equivalent to ~60.000 lenses in total in a survey as wide as Euclid, but at the CFHTLS resolution and depth.2016A&A...592A..75Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/592/A75CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/317 : The CFHTLS Survey (T0007 release) (Hudelot+ 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/592/A75https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/592/A75http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/592/A75https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/592/A75https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/592/A75http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/592/A75GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/592/A75/table1 (*Grade-A and grade-B new lens candidates in CFHTLS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/592/A75/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/592/A75/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/592/A75/table1?GETtext/xml+votable180.050000true30.2905-6.34740.005555555555555556Cone search capability for table J/A+A/592/A75/tablea1 (Ring-like galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/592/A75/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/592/A75/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/592/A75/tablea1?GETtext/xml+votable180.050000true30.7113-4.120.005555555555555556Cone search capability for table J/A+A/592/A75/tablea2 (*Our grade-C candidates in CFHTLS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/592/A75/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/592/A75/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/592/A75/tablea2?GETtext/xml+votable180.050000true30.769-4.37070.0055555555555555564/714 5/2687 2851 2854 2860-2861 2944-2945 4373 4416 10230 10233 10236 10238 6/10741-10743 10745 11092-11093 11398-11399 11401-11403 11448-11450 11788 17489-17490 17500-17501 17503 17525 17668 17670-17672 17674-17678 17680-17681 17684 17687-17688 17690 17693-17694 17696-17698 17700-17701 17703 17708 17712 19027 19030-19032 19034-19035 19037-19038 19056 19058-19060 19062 19064-19065 19068-19069 19071 19153 19156-19157 19232 21840-21841 27298 36599 36606-36607 36769-36770 36772 36774-36777 36781-36782 36792 40910-40911 40926 40929 40931 40940-40941 40943 40948 40950-40951 40956-409582.381800341673347e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/592/A75?format=asciidefaultJ/A+A/592/A75/table1*Grade-A and grade-B new lens candidates in CFHTLSSimbadNameSimbad column added by the CDSmeta.idcharREEinstein radiuspixphys.angSize;srcfloatzPhotometric redshift (1)src.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/109] Sequential number, within the tablemeta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainB_zUpper value of redshift intervalsrc.redshift;stat.maxfloatb_zLower value of redshift intervalsrc.redshift;stat.minfloatReffEffective radius (1)pixphys.angSizefloatgmagSDSS g magnitude (1)magphot.mag;em.opt.Bfloate_gmagrms uncertainty on gmagmagstat.error;phot.mag;em.opt.BfloatrmagSDSS r magnitude (1)magphot.mag;em.opt.Rfloate_rmagrms uncertainty on rmagmagstat.error;phot.mag;em.opt.RfloatimagSDSS i magnitude (1)magphot.mag;em.opt.Ifloate_imagrms uncertainty on imagmagstat.error;phot.mag;em.opt.IfloatQual[AB] Quality flagmeta.code.qualcharCFHTLSDisplay the FTHTLS T007 data (Hudelot et al. 2012, Cat. II/317)meta.ref.urlcharJ/A+A/592/A75/tablea1Ring-like galaxiesSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/274]Sequential number within the tablemeta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainCFHTLSDisplay the FTHTLS T007 data (Hudelot et al. 2012, Cat. II/317)meta.ref.urlcharJ/A+A/592/A75/tablea2*Our grade-C candidates in CFHTLSSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/274]Sequential number within the tablemeta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainCFHTLSDisplay the FTHTLS T007 data (Hudelot et al. 2012, Cat. II/317)meta.ref.urlchar