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Gaia GraL: Gaia DR2 gravitational lens systems. I. New quadruply imaged quasar candidates around known quasars

dc.contributor.authorKRONE-MARTINS, A.
dc.contributor.authorDELCHAMBRE, L.
dc.contributor.authorWERTZ, O.
hal.structure.identifierM2A 2018
dc.contributor.authorDUCOURANT, C.
hal.structure.identifierLaboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides [CASSIOPEE]
dc.contributor.authorMIGNARD, F.
dc.contributor.authorKLÜTER, R. Teixeira J.
hal.structure.identifierM2A 2018
dc.contributor.authorLE CAMPION, J.-F.
hal.structure.identifierUniversità degli studi di Catania = University of Catania [Unict]
dc.contributor.authorGALLUCCIO, L.
hal.structure.identifierInstitut d'Astrophysique et de Géophysique [Liège]
dc.contributor.authorSURDEJ, J.
hal.structure.identifierZentrum für astronomie
dc.contributor.authorBASTIAN, U.
hal.structure.identifierMax-Planck-Institut für Astronomie [MPIA]
dc.contributor.authorWAMBSGANSS, J.
dc.contributor.authorGRAHAM, M. J.
dc.contributor.authorDJORGOVSKI, S. G.
hal.structure.identifierJoseph Louis LAGRANGE [LAGRANGE]
dc.contributor.authorSLEZAK, E.
dc.date.issued2018
dc.identifier.issn0004-6361
dc.description.abstractEnContext. Multiply imaged gravitationally lensed quasars are among the most interesting and useful observable extragalactic phenomena. Because their study constitutes a unique tool in various fields of astronomy, they are highly sought, but difficult to find. Even in this era of all-sky surveys, discovering them remains a great challenge, with barely a few hundred systems currently known. Aims: We aim to discover new multiply imaged quasar candidates in the recently published Gaia Data Release 2 (DR2), which is the astrometric and photometric all-sky survey with the highest spatial resolution that achieves effective resolutions from 0.4″ to 2.2″. Methods: We cross-matched a merged list of quasars and candidates with Gaia DR2 and found 1 839 143 counterparts within 0.5″. We then searched matches with more than two Gaia DR2 counterparts within 6″. We further narrowed the resulting list using astrometry and photometry compatibility criteria between the Gaia DR2 counterparts. A supervised machine-learning method, called extremely randomized trees, was finally adopted to assign a probability of being lensed to each remaining system. Results: We report the discovery of two quadruply imaged quasar candidates that are fully detected in Gaia DR2. These are the most promising new quasar lens candidates from Gaia DR2 and a simple singular isothermal ellipsoid lens model is able to reproduce their image positions to within 1 mas. This Letter demonstrates the discovery potential of Gaia for gravitational lenses.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enAstrophysics - Cosmology and Nongalactic Astrophysics
dc.subject.enAstrophysics - Astrophysics of Galaxies
dc.subject.enAstrophysics - Instrumentation and Methods for Astrophysics
dc.title.enGaia GraL: Gaia DR2 gravitational lens systems. I. New quadruply imaged quasar candidates around known quasars
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201833337
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]
dc.identifier.arxiv1804.11051
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.L11
bordeaux.volume616
bordeaux.peerReviewedoui
hal.identifierhal-01797069
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01797069v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2018&rft.volume=616&rft.spage=id.L11&rft.epage=id.L11&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=KRONE-MARTINS,%20A.&DELCHAMBRE,%20L.&WERTZ,%20O.&DUCOURANT,%20C.&MIGNARD,%20F.&rft.genre=article


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