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Gaia GraL: Gaia DR2 gravitational lens systems

hal.structure.identifierM2A 2018
dc.contributor.authorDUCOURANT, C.
dc.contributor.authorWERTZ, O.
dc.contributor.authorKRONE-MARTINS, A.
hal.structure.identifierInstituto de Astronomia, Geofísica e Ciências Atmosféricas [São Paulo] [IAG]
dc.contributor.authorTEIXEIRA, R.
hal.structure.identifierM2A 2018
dc.contributor.authorLE CAMPION, J.-F.
hal.structure.identifierJoseph Louis LAGRANGE [LAGRANGE]
dc.contributor.authorGALLUCCIO, Laurent
dc.contributor.authorKLÜTER, J.
dc.contributor.authorDELCHAMBRE, L.
hal.structure.identifierInstitut d'Astrophysique et de Géophysique [Liège]
dc.contributor.authorSURDEJ, J.
hal.structure.identifierJoseph Louis LAGRANGE [LAGRANGE]
dc.contributor.authorMIGNARD, F.
hal.structure.identifierMax-Planck-Institut für Astronomie [MPIA]
dc.contributor.authorWAMBSGANSS, J.
hal.structure.identifierZentrum für astronomie
dc.contributor.authorBASTIAN, U.
dc.contributor.authorGRAHAM, M. J.
dc.contributor.authorDJORGOVSKI, S. G.
hal.structure.identifierJoseph Louis LAGRANGE [LAGRANGE]
hal.structure.identifierJoseph Louis LAGRANGE [LAGRANGE]
dc.contributor.authorSLEZAK, E.
dc.date.issued2018-10
dc.identifier.issn0004-6361
dc.description.abstractEnContext. Thanks to its spatial resolution, the ESA/Gaia space mission offers a unique opportunity to discover new multiply imaged quasars and to study the already known lensed systems at sub-milliarcsecond astrometric precisions.Aims. In this paper, we address the detection of the known multiply imaged quasars from the Gaia Data Release 2 (DR2) and determine the astrometric and photometric properties of the individually detected images found in the Gaia DR2 catalogue.Methods. We have compiled an exhaustive list of quasar gravitational lenses from the literature to search for counterparts in the Gaia DR2. We then analysed the astrometric and photometric properties of these Gaia’s detections. To highlight the tremendous potential of Gaia at the sub-milliarcsecond level we finally performed a simple Bayesian modelling of the well-known gravitational lens system HE0435-1223, using Gaia DR2 and HST astrometry.Results. From 481 known multiply imaged quasars, 206 have at least one image found in the Gaia DR2. Among the 44 known quadruply imaged quasars of the list, 29 have at least one image in the Gaia DR2, 12 of which are fully detected (2MASX J01471020+4630433, HE 0435-1223, SDSS1004+4112, PG1115+080, RXJ1131-1231, 2MASS J11344050-2103230, 2MASS J13102005-1714579, B1422+231, J1606-2333, J1721+8842, WFI2033-4723, WGD2038-4008), eight have three counterparts, eight have two and one has only one. As expected, the modelling of HE0435-1223 shows that the model parameters are significantly better constrained when using Gaia astrometry compared to HST astrometry, in particular the relative positions of the background quasar source and the centroid of the deflector. The Gaia sub-milliarcsecond astrometry also significantly reduces the parameter correlations.Conclusions. Besides providing an up-to-date list of multiply imaged quasars and their detection in the Gaia DR2, this paper shows that more complex modelling scenarios will certainly benefit from Gaia sub-milliarcsecond astrometry.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enAstrophysics - Astrophysics of Galaxies
dc.subject.enAstrophysics - Instrumentation and Methods for Astrophysics
dc.subject.engravitational lensing: strong
dc.subject.enastrometry
dc.title.enGaia GraL: Gaia DR2 gravitational lens systems
dc.title.enII. The known multiply imaged quasars
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201833480
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]
dc.identifier.arxiv1805.07359
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageA56
bordeaux.volume618
bordeaux.peerReviewedoui
hal.identifierhal-01797139
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01797139v1
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