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DES meets Gaia: discovery of strongly lensed quasars from a multiplet search

Agnello, A. and Eifler, T. F. (2018) DES meets Gaia: discovery of strongly lensed quasars from a multiplet search. Monthly Notices of the Royal Astronomical Society, 479 (4). pp. 4345-4354. ISSN 0035-8711.

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We report the discovery, spectroscopic confirmation, and first lens models of the first, strongly lensed quasars from a combined search in WISE and Gaia-DR1 over the DES footprint. Their Einstein radii span a range between ≈2.0 arcsec and ≈0.4 arcsec. Two of these (WGD2038-4008, RA = 20:38:02.65, Dec. = −40:08:14.64; WGD2021-4115, RA = 20:21:39.45, Dec. = −41:15:57.11) also have confirmed deflector redshifts. The four-image lens WGD2038-4008, with source and deflector redshifts s = 0.777 ± 0.001 and zl = 0.230 ± 0.002, respectively, has a deflector with radius R_(eff) ≈ 3.4 arcsec, stellar mass log(M⋆/M⊙) = 11.64^(+0.20)_(−0.43) , and extended isophotal shape variation. Simple lens models yield Einstein radii RE = (1.30 ± 0.04) arcsec, axis ratio q = 0.75 ± 0.1 (compatible with that of the starlight) and considerable shear-ellipticity degeneracies. The two-image lens WGD2021-4115 has z_s = 1.390 ± 0.001 and z_l = 0.335 ± 0.002, and Einstein radius R_E = (1.1 ± 0.1) arcsec, but higher-resolution imaging is needed to accurately separate the deflector and faint quasar image. Analogous lens model degeneracies hold for the other six lenses (J0146-1133, J0150-4041, J0235-2433, J0245-0556, J0259-2338, and J0508-2748) shown in this paper.

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Eifler, T. F.0000-0002-1894-3301
Additional Information:© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2018 May 21. Received 2018 May 20; in original form 2017 October 21. Published: 04 June 2018. This paper was written as part of the STRong lensing Insights into the Dark Energy Survey (STRIDES) collaboration, a broad external collaboration of the Dark Energy Survey, TT acknowledges support from NSF through grant AST-1450141, and from the Packard Foundation through a Packard Research Fellowship. CDF acknowledges support from the U.S. National Science Foundation through grant number AST-1312329. Funding for the DES Projects has been provided by the DOE and NSF (USA), MISE (Spain), STFC (UK), HEFCE (UK), NCSA (UIUC), KICP (U. Chicago), CCAPP (Ohio State), MIFPA (Texas A&M), CNPQ, FAPERJ, FINEP (Brazil), MINECO (Spain), DFG (Germany), and the Collaborating Institutions in the Dark Energy Survey. The Collaborating Institutions are Argonne Lab, UC Santa Cruz, University of Cambridge, CIEMAT-Madrid, University of Chicago, University College London, DES-Brazil Consortium, University of Edinburgh, ETH Zürich, Fermilab, University of Illinois, ICE (IEEC-CSIC), IFAE Barcelona, Lawrence Berkeley Lab, LMU München and the associated Excellence Cluster Universe, University of Michigan, NOAO, University of Nottingham, Ohio State University, University of Pennsylvania, University of Portsmouth, SLAC National Lab, Stanford University, University of Sussex, and Texas A&M University. The DES Data Management System is supported by the NSF under grant number AST-1138766. The DES participants from Spanish institutions are partially supported by MINECO under grants AYA2012-39559, ESP2013-48274, FPA2013-47986, and Centro de Excelencia Severo Ochoa SEV-2012-0234. Research leading to these results has received funding from the ERC under the EU’s 7th Framework Programme including grants ERC 240672, 291329, and 306478. This research has made use of the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This work has made use of data from the European Space Agency (ESA) mission Gaia (, processed by the Gaia Data Processing and Analysis Consortium (DPAC, Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This work is based in part on observations obtained at the Southern Astrophysical Research (SOAR) telescope, which is a joint project of the Ministério da Ciência, Tecnologia, e Inovação (MCTI) da República Federativa do Brasil, the U.S. National Optical Astronomy Observatory (NOAO), the University of North Carolina at Chapel Hill (UNC), and Michigan State University (MSU). AA wishes to thank the ITC-Harvard for hospitality in 2017 February and June, when most of the work reported here was made.
Funding AgencyGrant Number
David and Lucile Packard FoundationUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Ministerio de Educación y Ciencia (MEC)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Higher Education Funding Council for EnglandUNSPECIFIED
University of Illinois Urbana-ChampaignUNSPECIFIED
University of ChicagoUNSPECIFIED
Ohio State UniversityUNSPECIFIED
Texas A&M UniversityUNSPECIFIED
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNSPECIFIED
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)UNSPECIFIED
Financiadora de Estudos e Projetos (FINEP)UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Argonne National LaboratoryUNSPECIFIED
University of California, Santa CruzUNSPECIFIED
University of CambridgeUNSPECIFIED
Centro de Investigaciones Energéticas, Medioambientales y TecnológicasUNSPECIFIED
University College LondonUNSPECIFIED
DES-Brazil ConsortiumUNSPECIFIED
University of EdinburghUNSPECIFIED
University of IllinoisUNSPECIFIED
Institut de Ciències de l’EspaiUNSPECIFIED
Institut de Física d’Altes EnergiesUNSPECIFIED
Lawrence Berkeley National LaboratoryUNSPECIFIED
Ludwig-Maximilians Universität MünchenUNSPECIFIED
Excellence Cluster UniverseUNSPECIFIED
University of MichiganUNSPECIFIED
National Optical Astronomy Observatory (NOAO)UNSPECIFIED
University of NottinghamUNSPECIFIED
University of PennsylvaniaUNSPECIFIED
University of PortsmouthUNSPECIFIED
Stanford Linear Accelerator CenterUNSPECIFIED
Stanford UniversityUNSPECIFIED
University of SussexUNSPECIFIED
Ministerio de Economía, Industria y Competitividad (MINECO)AYA2012-39559
Ministerio de Economía, Industria y Competitividad (MINECO)ESP2013-48274
Ministerio de Economía, Industria y Competitividad (MINECO)FPA2013-47986
Centro de Excelencia Severo OchoaSEV-2012-0234
European Research Council (ERC)240672
European Research Council (ERC)291329
European Research Council (ERC)306478
Subject Keywords:gravitational lensing: strong –methods: statistical – techniques: image processing – surveys
Issue or Number:4
Record Number:CaltechAUTHORS:20180829-144739731
Persistent URL:
Official Citation:A Agnello, H Lin, N Kuropatkin, E Buckley-Geer, T Anguita, P L Schechter, T Morishita, V Motta, K Rojas, T Treu, A Amara, M W Auger, F Courbin, C D Fassnacht, J Frieman, A More, P J Marshall, R G McMahon, G Meylan, S H Suyu, K Glazebrook, N Morgan, B Nord, T M C Abbott, F B Abdalla, J Annis, K Bechtol, A Benoit-Lévy, E Bertin, R A Bernstein, D Brooks, D L Burke, A Carnero Rosell, J Carretero, C E Cunha, C B D’Andrea, L N da Costa, S Desai, A Drlica-Wagner, T F Eifler, B Flaugher, J García-Bellido, E Gaztanaga, D W Gerdes, D Gruen, R A Gruendl, J Gschwend, G Gutierrez, K Honscheid, D J James, K Kuehn, O Lahav, M Lima, M A G Maia, M March, F Menanteau, R Miquel, R L C Ogando, A A Plazas, E Sanchez, V Scarpine, R Schindler, M Schubnell, I Sevilla-Noarbe, M Smith, M Soares-Santos, F Sobreira, E Suchyta, M E C Swanson, G Tarle, D Tucker, R Wechsler; DES meets Gaia: discovery of strongly lensed quasars from a multiplet search, Monthly Notices of the Royal Astronomical Society, Volume 479, Issue 4, 1 October 2018, Pages 4345–4354,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89286
Deposited By: Tony Diaz
Deposited On:29 Aug 2018 23:28
Last Modified:09 Mar 2020 13:18

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