J/A+A/666/A1ivo://CDS.VizieR/J/A+A/666/A1doi:10.26093/cds/vizier.36660001CDSSavary E.Rojas K.Maus M.Clement B.Courbin F.Gavazzi R.,Chan J.H.H.Lemon C.Vernardos G.Canameras R.Schuldt S.Suyu S.H.,Cuillandre J.-C.Fabbro S.Gwyn S.Hudson M.J.Kilbinger M.Scott D.,Stone C.2023-07-03T13:26:27Z2022-09-27T10:54:56ZCDS support team

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

cds-question@unistra.frsurveysgravitational-lensingWe present a search for galaxy-scale strong gravitational lenses in the initial 2500 square degrees of the Canada-France Imaging Survey (CFIS). We design a convolutional neural network (CNN) committee that we apply on a selection of 2344002 exquisite-seeing r-band images of color-selected luminous red galaxies (LRGs). Our classification uses a realistic training set where both the lensing galaxies and the lensed sources are taken from real data, i.e., the CFIS r-band images themselves and Hubble Space Telescope (HST). A total of 9460 candidates obtain a score above 0.5 with the CNN committee. After a visual inspection of the candidates, we find a total of 133 lens candidates, among which 104 are completely new. The set of false positives mainly contains ring, spiral and merger galaxies and to a smaller extent galaxies with nearby companions. We classify 32 of the lens candidates as secure lenses and 101 as maybe lenses. For the 32 best-quality lenses, we also fit a singular isothermal ellipsoid mass profile with external shear along with an elliptical Sersic profile for the lens and source light. This automated modeling step provides distributions of properties for both sources and lenses which have Einstein radii in the range 0.5"<{theta}_E_<2.5". Finally, we introduce a new lens/source single-band deblending algorithm based on auto-encoders representation of our candidates. This is the first time an end-to-end lens-finding and modeling pipeline is assembled together, in view of future lens searches in single band, as will be possible with Euclid.2022A&A...666A...1Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/666/A1CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/666/A1https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/666/A1http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/666/A1https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/666/A1https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/666/A1http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/666/A1GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/666/A1/lenses (Lens candidates obtained after the last stage of the visual inspection (table 1))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/666/A1/lenses?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/666/A1/lenses?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/666/A1/lenses?GETtext/xml+votable180.050000true254.2916731.847780.005555555555555556Cone search capability for table J/A+A/666/A1/spirals (Objects flagged as spiral galaxies during visual inspection (table 4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/666/A1/spirals?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/666/A1/spirals?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/666/A1/spirals?GETtext/xml+votable180.050000true34.7208330.021390.005555555555555556Cone search capability for table J/A+A/666/A1/rings (Objects flagged as ring galaxies during visual inspection (table 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/666/A1/rings?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/666/A1/rings?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/666/A1/rings?GETtext/xml+votable180.050000true183.7666730.00750.005555555555555556Cone search capability for table J/A+A/666/A1/mergers (Objects flagged as mergers during visual inspection (table 5))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/666/A1/mergers?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/666/A1/mergers?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/666/A1/mergers?GETtext/xml+votable180.050000true34.7208330.021390.0055555555555555565/576 644 1263 1269-1270 1276 1339 1428 1617 2332-2334 2347 2349 2413 2420 2425 2434 2741 2854 2864 5085 7147 7156 7160 6/937-938 942 955 2133-2135 2137 2139-2140 2157 2167 2173 2201 2213 2215 2220-2221 2225-2228 2230 2232-2234 2236 2239 2243 2252-2254 2276 2278 2308 2312-2313 2315 2320 2561-2566 2569 2572 2574 2580 2583 2586 2590 2592 2594 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28668 32665 32668 32670 32677-32679 32683 32686 32688-32689 32692-32693 32695-32698 32701 32715-32716 32719 32731 32736 32742 32745 32749-32752 32754 32760 32762https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/666/A1?format=asciidefaultJ/A+A/666/A1/lensesLens candidates obtained after the last stage of the visual inspection (table 1)RefReference(s) for candidates in the literature (1)meta.ref;pos.framecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCandidate identifier (UNIONS JHHMMSS+SSMMSS)meta.id;meta.maincharCNNscore[0.5/1.0] Output score from the neural networkstat.fit.goodnessfloatJ/A+A/666/A1/modelModeling parameter of the sure lens candidates (table 2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCandidate identifier (UNIONS JHHMMSS+SSMMSS)meta.id;meta.maincharrchi2[0.91/17.3] Reduced chi2stat.fit.chi2floatREEinstein radiusarcsecphys.angSize;srcfloatE_REEinstein radius error (upper value)arcsecstat.error;stat.maxfloate_REEinstein radius error (lower value)arcsecstat.errorfloatqmAxis ratiophys.size.axisRatiofloatE_qmAxis ratio error (upper value)stat.error;stat.maxfloate_qmAxis ratio error (lower value)stat.errorfloatphimPosition angle of the lens mass SIE modeldegpos.posAng;meta.modelledintE_phimPosition angle of the lens mass SIE model error (upper value)degstat.error;stat.maxinte_phimPosition angle of the lens mass SIE model error (lower value)degstat.errorintgammaextStrength of external shearstat.fit.paramfloatE_gammaextStrength of external shear error (upper value)stat.error;stat.maxfloate_gammaextStrength of external shear error (lower value)stat.errorfloatphiextAngle of external sheardegpos.posAngintE_phiextAngle of external shear error (upper value)degstat.error;stat.maxinte_phiextAngle of external shear error (lower value)degstat.errorintn_Name[*] Note on Name (1)meta.notecharJ/A+A/666/A1/spiralsObjects flagged as spiral galaxies during visual inspection (table 4)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCandidate identifier (UNIONS JHHMMSS+SSMMSS)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJ/A+A/666/A1/ringsObjects flagged as ring galaxies during visual inspection (table 3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCandidate identifier (UNIONS JHHMMSS+SSMMSS)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJ/A+A/666/A1/mergersObjects flagged as mergers during visual inspection (table 5)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCandidate identifier (UNIONS JHHMMSS+SSMMSS)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.main