Gaia GraL II - Gaia DR2 Gravitational Lens Systems: The Known Multiply Imaged Quasars

Abstract

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. In this paper, we address the detection of the known multiply-imaged quasars from the Gaia Data Release 2 and determine the astrometric and photometric properties of the individually detected images found in the Gaia DR2 catalogue. We have compiled an exhaustive list of quasar gravitational lenses from the literature to search for counterparts in the Gaia Data Release 2. We then analyze the astrometric and photometric properties of these Gaia's detections. To highlight the tremendous potential of Gaia at the sub-milliarcsecond level we finally perform a simple Bayesian modeling of the well-known gravitational lens system HE0435-1223, using Gaia Data Release 2 and HST astrometry. From 478 known multiply imaged quasars, 200 have at least one image found in the Gaia Data Release 2. Among the 41 known quadruply-imaged quasars of the list, 26 have at least one image in the Gaia Data Release 2, 12 of which are fully detected, 6 have three counterparts, 7 have two and 1 has only one. As expected, the modeling 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. Besides providing an up-to-date list of multiply imaged quasars and their detection in the Gaia DR2, this paper shows that more complex modeling scenarios will certainly benefit from Gaia sub-milliarcsecond astrometry.

arXiv comment12 pages, 5 figure, 4 tables - to be submitted to A&A - Comments are very welcome

References in corpus (34)

• Gaia Data Release 2: Catalogue validation
• Gaia Data Release 1: Catalogue validation
• A Gravitationally Lensed Quasar with Quadruple Images Separated by 14.62 Arcseconds
• CMU DeepLens: Deep Learning For Automatic Image-based Galaxy-Galaxy Strong Lens Finding
• Finding Strong Gravitational Lenses in the Kilo Degree Survey with Convolutional Neural Networks
• The Time Delays of Gravitational Lens HE0435-1223: An Early-Type Galaxy With a Rising Rotation Curve
• A survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z>2
• Gravitationally Lensed Quasars in Gaia: II. Discovery of 24 Lensed Quasars
• A New Hybrid Framework to Efficiently Model Lines of Sight to Gravitational Lenses
• Discovery of Two Gravitationally Lensed Quasars with Image Separations of 3 Arcseconds from the Sloan Digital Sky Survey
• LensExtractor: A Convolutional Neural Network in Search of Strong Gravitational Lenses
• VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning
• Gravitational lenses and lens candidates identified from the COSMOS field
• Data Mining for Gravitationally Lensed Quasars
• SDSSJ2222+2745 A Gravitationally Lensed Sextuple Quasar with Maximum Image Separation of 15.1" Discovered in the Sloan Giant Arcs Survey
• Spatially Resolved Galactic Wind in Lensed Galaxy RCSGA 032727-132609
• Strong lensing signatures of luminous structure and substructure in early-type galaxies
• Subaru Telescope adaptive optics observations of gravitationally lensed quasars in the Sloan Digital Sky Survey
• Gravitationally Lensed Quasars in Gaia: I. Resolving Small-Separation Lenses
• Quasar lenses and pairs in the VST-ATLAS and Gaia
• Support Vector Machine classification of strong gravitational lenses
• CLASS B2108+213: A new wide separation gravitational lens system
• New lensed quasars from the MUSCLES survey
• A new quadruple gravitational lens from the Hyper Suprime-Cam Survey: the puzzle of HSC~J115252+004733
• COSMOS 5921+0638: Characterization and analysis of a new strong gravitationally lensed AGN
• The ESA Gaia Archive: Data Release 1
• Serendipitous discovery of quadruply-imaged quasars: two diamonds
• HE 1113-0641: The Smallest Separation Gravitational Lens Identified by a Ground-based Optical Telescope
• Discovery and first models of the quadruply lensed quasar SDSS J1433+6007
• B0850+054: a new gravitational lens system from CLASS
• A Gravitationally Lensed Quasar Discovered in OGLE
• Discovery of the optically bright, wide separation double quasar SDSS J1442+4055
• Dark matter fraction of low-mass cluster members probed by galaxy-scale strong lensing
• A QSO plus host system lensed into a 6" Einstein ring by a low redshift galaxy

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• Microlensing flux ratio predictions for Euclid
• Gaia DR2 Gravitational Lens Systems I: New lensed quasar candidates around known quasars
• Serendipitous discovery of a physical binary quasar at z=1.76