J/ApJ/785/144ivo://CDS.VizieR/J/ApJ/785/144doi:10.26093/cds/vizier.17850144CDSGavazzi R.Marshall P.J.Treu T.Sonnenfeld A.2017-10-16T09:01:42Z2017-06-27T07:38:31ZCDS support team

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

cds-question@unistra.frgalaxiescatalogsgravitational-lensingvisible-astronomysloan-photometryredshiftedWe present RINGFINDER, a tool for finding galaxy-scale strong gravitational lenses in multi-band imaging data. By construction, the method is sensitive to configurations involving a massive foreground ETG and a faint, background, blue source. RINGFINDER detects the presence of blue residuals embedded in an otherwise smooth red light distribution by difference imaging in two bands. The method is automated for efficient application to current and future surveys, having originally been designed for the 150 deg^2^ Canada-France-Hawaii Telescope Legacy Survey (CFHTLS). We describe each of the steps of RINGFINDER. We then carry out extensive simulations to assess completeness and purity. For sources with magnification {mu}>4, RINGFINDER reaches 42% (25%) completeness and 29% (86%) purity before (after) visual inspection. The completeness of RINGFINDER is substantially improved in the particular range of Einstein radii 0.8"<=R_Ein_<=2.0" and lensed images brighter than g=22.5, where it can be as high as ~70%. RINGFINDER does not introduce any significant bias in the source or deflector population. We conclude by presenting the final catalog of RINGFINDER CFHTLS galaxy-scale strong lens candidates. Additional information obtained with Hubble Space Telescope and Keck adaptive optics high-resolution imaging, and with Keck and Very Large Telescope spectroscopy, is used to assess the validity of our classification and measure the redshift of the foreground and the background objects. From an initial sample of 640000 ETGs, RINGFINDER returns 2500 candidates, which we further reduce by visual inspection to 330 candidates. We confirm 33 new gravitational lenses from the main sample of candidates, plus an additional 16 systems taken from earlier versions of RINGFINDER. First applications are presented in the Strong Lensing Legacy Survey galaxy-scale lens sample paper series.2014ApJ...785..144Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/785/144CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/749/38 : CFHTLS-SL2S-ARCS strong lens candidates (More+, 2012)J/ApJ/777/97 : SL2S galaxy-scale lens sample. III. (Sonnenfeld+, 2013)J/ApJ/833/194 : Group of galaxies in gravitational lens fields (Wilson+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/785/144https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/785/144http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/785/144https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/785/144https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/785/144http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/785/144GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/785/144/table3 (Additional SL2S lens candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/785/144/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/785/144/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/785/144/table3?GETtext/xml+votable180.050000true32.1379-7.23720.005555555555555556Cone search capability for table J/ApJ/785/144/table1 (The SL2S galaxy-scale main lens candidates in the CFHTLS-Wide)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/785/144/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/785/144/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/785/144/table1?GETtext/xml+votable180.050000true31.2392-11.05260.0055555555555555565/2851 2858 2944 2945 4372 4373 4375 4416 4417 4418 4421 4422 4425 4758 6814 9195 10233 10236 10238 10239 6/10742 10743 10745 10748 10749 10751 11398 11402 11403 11417 11418 11419 11424 11425 11426 11430 11431 11439 11440 11441 11442 11444 11445 11446 11448 11449 11792 17497 17525 17676 17677 17678 17680 17681 17682 17692 17693 17696 17697 17699 17705 17708 17710 17712 17714 19021 19027 19030 19037 19038 19039 19056 19059 19060 19061 19064 19065 19068 19070 19156 21829 36606 36607 36769 36770 36771 36772 36773 36774 36776 36778 36779 36786 36793 36794 36795 36798 36799 40911 40923 40926 40931 40940 40941 40943 40950 40951 484782.381800341673347e-19 2.821731604724377e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/785/144?format=asciiOpticaldefaultJ/ApJ/785/144/table3Additional SL2S lens candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSL2S catalog identifier (SL2S JHHMMSS+DDMMSS in Simbad) (1)meta.id;meta.tablecharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainimagSDSS i band candidate deflector magnitudemagphot.mag;em.opt.Ifloatzphot? Coupon et al. (2009A&A...500..981C) photometric redshiftsrc.redshiftfloatnullablezd? Deflector redshiftsrc.redshift;pos.heliocentricfloatnullablezs? Source redshiftsrc.redshift;pos.heliocentricfloatnullableqflag[2/3]? Quality factor (2)meta.code.qualintnullableConfirm[0/3]? Confirmed code (3)meta.codeintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/785/144/table1The SL2S galaxy-scale main lens candidates in the CFHTLS-WiderecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSL2S catalog identifier (SL2S JHHMMSS+DDMMSS in Simbad) (1)meta.id;meta.tablecharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainimagSDSS i band candidate deflector magnitudemagphot.mag;em.opt.Ifloatzphot? Coupon et al. (2009A&A...500..981C) photometric redshiftsrc.redshiftfloatnullablezd? Deflector redshiftsrc.redshift;pos.heliocentricfloatnullablezs? Source redshiftsrc.redshift;pos.heliocentricfloatnullableqflag[2/3]? Quality factor (2)meta.code.qualintnullableConfirm[0/3]? Confirmed code (3)meta.codeintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar