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

Krone-Martins, A. and Delchambre, L. and Wertz, O. and Ducourant, C. and Mignard, F. and Teixeira, R. and Klüter, J. and Le Campion, J.-F. and Galluccio, L. and Surdej, J. and Bastian, U. and Wambsganss, J. and Graham, M. J. and Djorgovski, S. G. and Slezak, E. (2018) Gaia GraL: Gaia DR2 gravitational lens systems. I. New quadruply imaged quasar candidates around known quasars. Astronomy and Astrophysics, 616 . Art. No. L11. ISSN 0004-6361. https://resolver.caltech.edu/CaltechAUTHORS:20180906-132818612

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Abstract

Context. 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1051/0004-6361/201833337DOIArticle
https://arxiv.org/abs/1804.11051arXivDiscussion Paper
ORCID:
AuthorORCID
Wertz, O.0000-0003-3849-2285
Ducourant, C.0000-0003-4843-8979
Surdej, J.0000-0002-7005-1976
Graham, M. J.0000-0002-3168-0139
Djorgovski, S. G.0000-0002-0603-3087
Alternate Title:Gaia DR2 Gravitational Lens Systems I: New lensed quasar candidates around known quasars
Additional Information:© 2018 ESO. Received 1 May 2018; Accepted 5 July 2018. Published online 21 August 2018. We thank the referee for comments that improved this Letter. AKM acknowledges the support from the Portuguese Fundação para a Ciência e a Tecnologia (FCT) through grants SFRH/BPD/74697/2010, from the Portuguese Strategic Programme UID/FIS/00099/2013 for CENTRA, from the ESA contract AO/1-7836/14/NL/HB and from the Caltech Division of Physics, Mathematics and Astronomy for hosting a research leave during 2017– 2018, when this paper was prepared. LD acknowledges support from the ESA PRODEX Programme “Gaia-DPAC QSOs” and from the Belgian Federal Science Policy Office. OW is supported by the Humboldt Research Fellowship for Postdoctoral Researchers. SGD and MJG acknowledge a partial support from the NSF grants AST-1413600 and AST-1518308, and the NASA grant 16-ADAP16-0232. We acknowledge partial support from “Actions sur projet INSU-PNGRAM”, and from the Brazil–France exchange programmes Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) – Comité Français d’Évaluation de la Coopération Universitaire et Scientifique avec le Brésil (COFECUB). This work has made use of the computing facilities of the Laboratory of Astroinformatics (IAG/USP, NAT/Unicsul), whose purchase was made possible by the Brazilian agency FAPESP (grant 2009/54006-4) and the INCT-A, and we thank the entire LAi team, specially Carlos Paladini, Ulisses Manzo Castello, Luis Ricardo Manrique and Alex Carciofi for the support. This work has made use of results from the ESA space mission Gaia, the data from which were 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. The Gaia mission website is: http://www.cosmos.esa.int/gaia. Some of the authors are members of the Gaia Data Processing and Analysis Consortium (DPAC).
Funders:
Funding AgencyGrant Number
Fundação para a Ciência e a TecnologiaSFRH/BPD/74697/2010
Fundação para a Ciência e a TecnologiaUID/FIS/00099/2013
European Space AgencyAO/1-7836/14/NL/HB
Belgian Federal Science Policy Office (BELSPO)UNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
NSFAST-1413600
NSFAST-1518308
NASA16-ADAP16-0232
Institut National des Sciences de l'Univers (INSU)UNSPECIFIED
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)2009/54006-4
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)UNSPECIFIED
Comité Français d’Évaluation de la Coopération Universitaire et Scientifique avec le Brésil (COFECUB)UNSPECIFIED
Gaia Multilateral AgreementUNSPECIFIED
Subject Keywords:gravitational lensing: strong – quasars: general – astrometry – methods: data analysis – catalogs – surveys
Record Number:CaltechAUTHORS:20180906-132818612
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180906-132818612
Official Citation:Gaia GraL: Gaia DR2 gravitational lens systems - I. New quadruply imaged quasar candidates around known quasars. A. Krone-Martins, L. Delchambre, O. Wertz, C. Ducourant, F. Mignard, R. Teixeira, J. Klüter, J.-F. Le Campion, L. Galluccio, J. Surdej, U. Bastian, J. Wambsganss, M. J. Graham, S. G. Djorgovski and E. Slezak. A&A, 616 (2018) L11. DOI: https://doi.org/10.1051/0004-6361/201833337
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89420
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Sep 2018 00:10
Last Modified:09 Mar 2020 13:18

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