J/ApJ/856/68ivo://CDS.VizieR/J/ApJ/856/68doi:10.26093/cds/vizier.18560068CDSPourrahmani M.Nayyeri H.Cooray A.2022-03-08T14:20:03Z2019-03-14T12:01:48ZCDS support team

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

cds-question@unistra.frgravitational-lensinghst-photometryvisible-astronomyIn this work, we present our machine learning classification algorithm for identifying strong gravitational lenses from wide-area surveys using convolutional neural networks; LensFlow. We train and test the algorithm using a wide variety of strong gravitational lens configurations from simulations of lensing events. Images are processed through multiple convolutional layers that extract feature maps necessary to assign a lens probability to each image. LensFlow provides a ranking scheme for all sources that could be used to identify potential gravitational lens candidates by significantly reducing the number of images that have to be visually inspected. We apply our algorithm to the HST/ACS i-band observations of the COSMOS field and present our sample of identified lensing candidates. The developed machine learning algorithm is more computationally efficient and complimentary to classical lens identification algorithms and is ideal for discovering such events across wide areas from current and future surveys such as LSST and WFIRST.2018ApJ...856...68Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/856/68CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)J/ApJ/621/53 : Multiple arc systems in A1689 (Broadhurst+, 2005)J/ApJS/176/19 : COSMOS: strong lens systems (Faure+, 2008)J/ApJ/749/38 : CFHTLS-SL2S-ARCS strong lens candidates (More+, 2012)J/ApJS/199/25 : CLASH sources for MACS1149.6+2223 (Postman+, 2012)J/ApJ/797/138 : Properties of SMG lens candidates (Calanog+, 2014)J/ApJ/785/144 : SL2S galaxy-scale sample of lens candidates (Gavazzi+, 2014)J/ApJ/800/18 : HST/WFC3 observations of z~7-8 galaxies in A2744 (Atek+, 2015)J/ApJ/812/114 : Grism Lens-Amplified Survey from Space (GLASS) I. (Treu+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/856/68https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/856/68http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/856/68https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/856/68https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/856/68http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/856/68GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/856/68/table2 (Catalog of identified lenses by LensFlow)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/856/68/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/856/68/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/856/68/table2?GETtext/xml+votable180.050000true149.545323061.614163890.0055555555555555565/6814 6/27245 27247https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/856/68?format=asciiOpticaldefaultJ/ApJ/856/68/table2Catalog of identified lenses by LensFlowSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/92] Lens number (1)meta.id;meta.mainintf_Seq[b] Flag on Seq (2)meta.codecharRAJ2000[149.4/150.8] Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000[1.6/2.9] Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainRE[0.3/3] Einstein radiusarcsecphys.angSize;srcfloatimag[18.5/23.6] HST/ACS i-band AB magnitudemagphot.mag;em.opt.IfloatRank[1/13610] LensFlow absolute rank of the lens among 236000 imagesmeta.numberintGrade[A-C] Average grade (3)meta.notecharCOSMOSDisplay data from the COSMOS catalog (II/284) within 1"meta.ref.urlchar