Gravitationally Lensed Quasars in Gaia: I. Resolving Small-Separation Lenses

Abstract

Gaia's exceptional resolution (FWHM $\sim$ 0.1${}^{\prime \prime }$) allows identification and cataloguing of the multiple images of gravitationally lensed quasars. We investigate a sample of 49 known lensed quasars in the SDSS footprint, with image separations less than 2${}^{\prime \prime }$, and find that 8 are detected with multiple components in the first Gaia data release. In the case of the 41 single Gaia detections, we generally are able to distinguish these lensed quasars from single quasars when comparing Gaia flux and position measurements to those of Pan-STARRS and SDSS. This is because the multiple images of these lensed quasars are typically blended in ground-based imaging and therefore the total flux and a flux-weighted centroid are measured, which can differ significantly from the fluxes and centroids of the individual components detected by Gaia. We compare the fluxes through an empirical fit of Pan-STARRS griz photometry to the wide optical Gaia bandpass values using a sample of isolated quasars. The positional offsets are calculated from a recalibrated astrometric SDSS catalogue. Applying flux and centroid difference criteria to spectroscopically confirmed quasars, we discover 4 new sub-arcsecond-separation lensed quasar candidates which have two distinct components of similar colour in archival CFHT or HSC data. Our method based on single Gaia detections can be used to identify the $\sim$ 1400 lensed quasars with image separation above 0.5${}^{\prime \prime }$, expected to have only one image bright enough to be detected by Gaia.

arXiv commentAccepted for publication in MNRAS, 10 pages, 10 figures

References in corpus (47)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Gaia mission
• The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
• Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Quasar Sample
• The Galactic disk mass function: reconciliation of the HST and nearby determinations
• The Pan-STARRS1 Surveys
• Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes
• H0LiCOW V. New COSMOGRAIL time delays of HE0435-1223: $H_0$ to 3.8% precision from strong lensing in a flat $\Lambda$CDM model
• Gravitationally lensed quasars and supernovae in future wide-field optical imaging surveys
• Gaia Data Release 1: Catalogue validation
• A Description of Quasar Variability Measured Using Repeated SDSS and POSS Imaging
• Binary Quasars in the Sloan Digital Sky Survey: Evidence for Excess Clustering on Small Scales
• The astrometric core solution for the Gaia mission. Overview of models, algorithms and software implementation
• The Sloan Digital Sky Survey Quasar Lens Search. I. Candidate Selection Algorithm
• The Sloan Digital Sky Survey Quasar Lens Search. V. Final Catalog from the Seventh Data Release
• The Microlensing Properties of a Sample of 87 Lensed Quasars
• The stellar and dark matter distributions in elliptical galaxies from the ensemble of strong gravitational lenses
• Gaia Data Release 1, Pre-processing and source list creation
• Keck Laser Guide Star Adaptive Optics Monitoring of 2MASS J1534-2952AB: First Dynamical Mass Determination of a Binary T Dwarf
• The Sloan Digital Sky Survey Quasar Lens Search. II. Statistical Lens Sample from the Third Data Release
• A microlensing study of the accretion disc in the quasar MG 0414+0534
• A calibration of the stellar mass fundamental plane at z ~ 0.5 using the micro-lensing induced flux ratio anomalies of macro-lensed quasars
• The Sloan Digital Sky Survey Quasar Lens Search. VI. Constraints on Dark Energy and the Evolution of Massive Galaxies
• The slight spin of the old stellar halo
• Dark Matter Fraction in Lens Galaxies: New Estimates from Microlensing
• VDES J2325-5229 a z=2.7 gravitationally lensed quasar discovered using morphology independent supervised machine learning
• Gaia 1 and 2. A pair of new Galactic star clusters
• Gaia data release 1: Principles of the photometric calibration of the G band
• COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses XII. Time delays of the doubly lensed quasars SDSS J1206+4332 and HS 2209+1914
• Dissecting a galaxy: mass distribution of 2237+0305
• Gravitational lensing reveals extreme dust-obscured star formation in quasar host galaxies
• The Sloan Digital Sky Survey Quasar Lens Search. IV. Statistical Lens Sample from the Fifth Data Release
• A microlensing measurement of dark matter fractions in three lensing galaxies
• A Simple Method To Find All Lensed Quasars
• Five New High-Redshift Quasar Lenses from the Sloan Digital Sky Survey
• H0LiCOW VII. Cosmic evolution of the correlation between black hole mass and host galaxy luminosity
• Probing the Broad Line Region and the Accretion Disk in the Lensed Quasars HE0435-1223, WFI2033-4723, and HE2149-2745 using Gravitational Microlensing
• Discovering Gravitational Lenses Through Measurements Of Their Time Delays
• Two New Gravitationally Lensed Double Quasars from the Sloan Digital Sky Survey
• Discovery of a Gravitationally Lensed Quasar from the Sloan Digital Sky Survey: SDSS J133222.62+034739.9
• SBS 0909+532: A New Double Gravitational Lens or Binary Quasar?
• Analysis and interpretation of the Cramer-Rao lower-bound in astrometry: One dimensional case
• Discovery and first models of the quadruply lensed quasar SDSS J1433+6007
• A fast 2D image reconstruction algorithm from 1D data for the Gaia mission
• Identification of partially resolved binaries in Pan-STARRS1 data
• Improving efficiency in radio surveys for gravitational lenses
• SDSS J133401.39+331534.3: A New Subarcsecond Gravitationally Lensed Quasar

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• The Southern Stellar Stream Spectroscopic Survey ($S^5$): Overview, Target Selection, Data Reduction, Validation, and Early Science
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• Euclid: Early Release Observations -- Overview of the Perseus cluster and analysis of its luminosity and stellar mass functions
• Identification of Galaxy-Galaxy Strong Lens Candidates in the DECam Local Volume Exploration Survey Using Machine Learning
• HOLISMOKES -- IX. Neural network inference of strong-lens parameters and uncertainties from ground-based images
• Discovering Strongly-lensed QSOs From Unresolved Light Curves
• Lensed quasar search via time variability with the HSC transient survey
• Gaia GraL II - Gaia DR2 Gravitational Lens Systems: The Known Multiply Imaged Quasars
• Spectroscopic classification of a complete sample of astrometrically-selected quasar candidates using Gaia DR2
• Varstrometry Selected Radio-Loud Candidates of Dual and Off-Nucleus Quasars at Sub-kpc Scales
• Optimality of the Maximum Likelihood estimator in Astrometry
• Gaia: the Galaxy in six (and more) dimensions
• Strongly lensed candidates from the HSC transient survey
• Strange Quasar Candidates with Abnormal Astrometric Characteristics from Gaia EDR3 and SDSS (SQUAB-II): Optical Identifications
• Image Flux Ratios of Gravitationally Lensed HS 0810+2554 with High Resolution Infrared Imaging
• Search for Quasar Pairs with $Gaia$ Astrometric Data. I. Method and Candidates
• Finding Lensed Radio Sources with the VLA Sky Survey
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• Fast, dust-poor outflows in the local candidate dual AGN MCG-03-34-64 observed with VLT/ERIS
• The Contribution of Faint, Failed and Defunct Stars to the "Stellar" Masses of Galaxies