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Gaia GraL: Gaia DR2 Gravitational Lens Systems. V. Doubly-imaged QSOs discovered from entropy and wavelets

dc.contributor.authorKRONE-MARTINS, A.
dc.contributor.authorGRAHAM, M. J.
dc.contributor.authorSTERN, D.
dc.contributor.authorDJORGOVSKI, S. G.
dc.contributor.authorDELCHAMBRE, L.
hal.structure.identifierM2A 2021
dc.contributor.authorDUCOURANT, C.
dc.contributor.authorTEIXEIRA, R.
dc.contributor.authorDRAKE, A. J.
dc.contributor.authorSCARANO JR., S.
dc.contributor.authorSURDEJ, J.
hal.structure.identifierJoseph Louis LAGRANGE [LAGRANGE]
dc.contributor.authorGALLUCCIO, Laurent
dc.contributor.authorJALAN, P.
dc.contributor.authorWERTZ, O.
dc.contributor.authorKLÜTER, J.
hal.structure.identifierJoseph Louis LAGRANGE [LAGRANGE]
dc.contributor.authorMIGNARD, F.
dc.contributor.authorSPINDOLA-DUARTE, C.
dc.contributor.authorDOBIE, D.
hal.structure.identifierJoseph Louis LAGRANGE [LAGRANGE]
dc.contributor.authorSLEZAK, E.
dc.contributor.authorSLUSE, D.
dc.contributor.authorMURPHY, T.
dc.contributor.authorBOEHM, C.
dc.contributor.authorNIERENBERG, A. M.
dc.contributor.authorBASTIAN, U.
dc.contributor.authorWAMBSGANSS, J.
hal.structure.identifierM2A 2021
dc.contributor.authorLECAMPION, J. -F.
dc.description.abstractEnThe discovery of multiply-imaged gravitationally lensed QSOs is fundamental to many astronomical and cosmological studies. However, these objects are rare and challenging to discover due to requirements of high-angular resolution astrometric, multiwavelength photometric and spectroscopic data. This has limited the number of known systems to a few hundred objects. We aim to reduce the constraints on angular resolution and discover multiply-imaged QSO candidates by using new candidate selection principles based on unresolved photometric time-series and ground-based images from public surveys. We selected candidates for multiply-imaged QSOs based on low levels of entropy computed from Catalina unresolved photometric time-series or Euclidean similarity to known lenses in a space defined by the wavelet power spectra of Pan-STARSS DR2 or DECaLS DR7 images, combined with multiple {\it Gaia} DR2 sources or large astrometric errors and supervised and unsupervised learning methods. We then confirmed spectroscopically some candidates with the Palomar Hale, Keck-I, and ESO/NTT telescopes. Here we report the discovery and confirmation of seven doubly-imaged QSOs and one likely double quasar. This demonstrates the potential of combining space-astrometry, even if unresolved, with low spatial-resolution photometric time-series and/or low-spatial resolution multi-band imaging to discover multiply-imaged lensed QSOs.
dc.language.isoen
dc.title.enGaia GraL: Gaia DR2 Gravitational Lens Systems. V. Doubly-imaged QSOs discovered from entropy and wavelets
dc.typeDocument de travail - Pré-publication
dc.subject.halSciences de l'ingénieur [physics]/Traitement du signal et de l'image
dc.subject.halStatistiques [stat]/Machine Learning [stat.ML]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]
dc.identifier.arxiv1912.08977
hal.identifierhal-03227288
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03227288v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.au=KRONE-MARTINS,%20A.&GRAHAM,%20M.%20J.&STERN,%20D.&DJORGOVSKI,%20S.%20G.&DELCHAMBRE,%20L.&rft.genre=preprint


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