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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Gaia GraL: Gaia DR2 gravitational lens systems II. The known multiply imaged quasars

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Ducourant, C. [1] ; Wertz, O. [2] ; Krone-Martins, A. [3] ; Teixeira, R. [4] ; Le Campion, J-F [1] ; Galluccio, L. [5] ; Klueter, J. [6] ; Delchambre, L. [7] ; Surdej, J. [7] ; Mignard, F. [5] ; Wambsganss, J. [6, 8] ; Bastian, U. [6] ; Graham, M. J. [9] ; Djorgovski, S. G. [9] ; Slezak, E. [5]
Total Authors: 15
[1] Univ Bordeaux, CNRS, Lab Astrophys Bordeaux, B18N, Allee Geoffroy St Hilaire, F-33615 Pessac - France
[2] Univ Bonn, Argelander Inst Astron, Hugel 71, D-53121 Bonn - Germany
[3] Univ Lisbon, Fac Ciencias, CENTRA, Ed C8, P-1749016 Lisbon - Portugal
[4] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao, 1226, Cidade Univ, BR-05508900 Sao Paulo, SP - Brazil
[5] Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Blvd Observ, CS 34229, F-06304 Nice - France
[6] Heidelberg Univ, Astron Rechen Inst, Zentrum Astron, Monchhofstr 12-14, D-69120 Heidelberg - Germany
[7] Univ Liege, Inst Astrophys & Geophys, 19c, Allee 6 Aout, B-4000 Liege - Belgium
[8] ISSI, Hallerstr 6, CH-3012 Bern - Switzerland
[9] CALTECH, 1200 E Calif Blvd, Pasadena, CA 91125 - USA
Total Affiliations: 9
Document type: Journal article
Source: Astronomy & Astrophysics; v. 618, OCT 12 2018.
Web of Science Citations: 4

Context. 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, 5D551004+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. (AU)

FAPESP's process: 09/54006-4 - A computer cluster for the Astronomy Department of the University of São Paulo Institute of Astronomy, Geophysics and Atmospheric Sciences and for the Cruzeiro do Sul University Astrophysics Center
Grantee:Elisabete Maria de Gouveia Dal Pino
Support type: Multi-user Equipment Program