A Gravitationally Lensed Quasar Discovered in OGLE

Abstract

We report the discovery of a new gravitationally lensed quasar (double) from the Optical Gravitational Lensing Experiment (OGLE) identified inside the $\sim$670 sq. deg area encompassing the Magellanic Clouds. The source was selected as one of $\sim$60 "red W1-W2" mid-IR objects from WISE and having a significant amount of variability in OGLE for both two (or more) nearby sources. This is the first detection of a gravitational lens, where the discovery is made "the other way around", meaning we first measured the time delay between the two lensed quasar images of $-132<t_{\mathrm{AB}}<-76$ days (90% CL), with the median $t_{\mathrm{AB}}\approx -102$ days (in the observer frame), and where the fainter image B lags image A. The system consists of the two quasar images separated by 1.5" on the sky, with $I\approx 20.0$ mag and $I\approx 19.6$ mag, respectively, and a lensing galaxy that becomes detectable as $I\approx 21.5$ mag source, 1.0" from image A, after subtracting the two lensed images. Both quasar images show clear AGN broad emission lines at $z=2.16$ in the NTT spectra. The SED fitting with the fixed source redshift provided the estimate of the lensing galaxy redshift of $z\approx 0.9\pm 0.2$ (90% CL), while its type is more likely to be elliptical (the SED-inferred and lens-model stellar mass is more likely present in ellipticals) than spiral (preferred redshift by the lens model).

arXiv commentAccepted by MNRAS

References in corpus (68)

• emcee: The MCMC Hammer
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• Mid-Infrared Selection of AGN with the Wide-Field Infrared Survey Explorer. I. Characterizing WISE-Selected AGN in COSMOS
• Are the Variations in Quasar Optical Flux Driven by Thermal Fluctuations?
• Spitzer Survey of the Large Magellanic Cloud, Surveying the Agents of a Galaxy's Evolution (SAGE) I: Overview and Initial Results
• The Green Valley is a Red Herring: Galaxy Zoo reveals two evolutionary pathways towards quenching of star formation in early- and late-type galaxies
• Modeling the Time Variability of SDSS Stripe 82 Quasars as a Damped Random Walk
• Direct Detection of CDM Substructure
• The Sloan Lens ACS Survey. X. Stellar, Dynamical, and Total Mass Correlations of Massive Early-type Galaxies
• The Sloan Lens ACS Survey. III - The Structure and Formation of Early-type Galaxies and their Evolution since z~1
• H0LiCOW V. New COSMOGRAIL time delays of HE0435-1223: $H_0$ to 3.8% precision from strong lensing in a flat $\Lambda$CDM model
• Dissecting the Gravitational Lens B1608+656. II. Precision Measurements of the Hubble Constant, Spatial Curvature, and the Dark Energy Equation of State
• Gravitationally lensed quasars and supernovae in future wide-field optical imaging surveys
• Mid-Infrared Selection of Active Galactic Nuclei with the Wide-Field Infrared Survey Explorer. II. Properties of WISE-Selected Active Galactic Nuclei in the NDWFS Boötes Field
• GROND - a 7-channel imager
• Quantifying Quasar Variability As Part of a General Approach To Classifying Continuously Varying Sources
• H0LiCOW I. $H_0$ Lenses in COSMOGRAIL's Wellspring: Program Overview
• An Alternative Approach To Measuring Reverberation Lags in Active Galactic Nuclei
• Is Quasar Optical Variability a Damped Random Walk?
• Low Resolution Spectral Templates For AGNs and Galaxies From 0.03 -- 30 microns
• Detection of a Dark Substructure through Gravitational Imaging
• Quantitative Interpretation of Quasar Microlensing Light Curves
• Flexible and Scalable Methods for Quantifying Stochastic Variability in the Era of Massive Time-Domain Astronomical Data Sets
• Quasar Microlensing at High Magnification and the Role of Dark Matter: Enhanced Fluctuations and Suppressed Saddlepoints
• Cosmology from gravitational lens time delays and Planck data
• The Sizes of the X-ray and Optical Emission Regions of RXJ1131-1231
• Surveying the Agents of Galaxy Evolution in the Tidally-Stripped, Low Metallicity Small Magellanic Cloud (SAGE-SMC). I. Overview
• Tests for Substructure in Gravitational Lenses
• Inference of the Cold Dark Matter substructure mass function at z=0.2 using strong gravitational lenses
• What Do Gravitational Lens Time Delays Measure?
• The Time Delays of Gravitational Lens HE0435-1223: An Early-Type Galaxy With a Rising Rotation Curve
• The Sloan Digital Sky Survey Quasar Lens Search. I. Candidate Selection Algorithm
• The SL2S Galaxy-scale Lens Sample. V. Dark Matter Halos and Stellar IMF of Massive Early-type Galaxies out to Redshift 0.8
• The Spatial Structure of An Accretion Disk
• Revisiting Stochastic Variability of AGNs with Structure Functions
• The Structure of the X-ray and Optical Emitting Regions of the Lensed Quasar Q 2237+0305
• Further Evidence that Quasar X-Ray Emitting Regions Are Compact: X-Ray and Optical Microlensing in the Lensed Quasar Q J0158-4325
• H0LiCOW III. Quantifying the effect of mass along the line of sight to the gravitational lens HE 0435-1223 through weighted galaxy counts
• Microlensing Makes Lensed Quasar Time Delays Significantly Time Variable
• The Sloan Digital Sky Survey Quasar Lens Search. II. Statistical Lens Sample from the Third Data Release
• A calibration of the stellar mass fundamental plane at z ~ 0.5 using the micro-lensing induced flux ratio anomalies of macro-lensed quasars
• A microlensing study of the accretion disc in the quasar MG 0414+0534
• Microlensing of Quasar Broad Emission Lines: Constraints on Broad Line Region Size
• Application of Stochastic Modeling to Analysis of Photometric Reverberation Mapping Data
• The Average Size and Temperature Profile of Quasar Accretion Disks
• 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
• The Dark-Matter Fraction in the Elliptical Galaxy Lensing the Quasar PG1115+080
• A Consistent Picture Emerges: A Compact X-ray Continuum Emission Region in the Gravitationally Lensed Quasar SDSS J0924+0219
• Constraining the dark energy equation of state with double source plane strong lenses
• The Magellanic Quasars Survey. III. Spectroscopic Confirmation of 758 AGNs Behind the Magellanic Clouds
• Discovery of two gravitationally lensed quasars in the Dark Energy Survey
• A Simple Method To Find All Lensed Quasars
• A microlensing measurement of dark matter fractions in three lensing galaxies
• Red nuggets grow inside-out: evidence from gravitational lensing
• First lensed quasar systems from the VST-ATLAS survey: one quad, two doubles and two pairs of lensless twins
• Microlensing of the broad-line region in the quadruply imaged quasar HE0435-1223
• Cosmological Parameters from Multiple-arc Gravitational Lensing Systems I: smooth lensing potentials
• The Magellanic Quasars Survey. II. Confirmation of 144 New Active Galactic Nuclei Behind the Southern Edge of the Large Magellanic Cloud
• Discovery of the Lensed Quasar System DES J0408-5354
• Gravitational Lensing Statistics as a Probe of Dark Energy
• Discovery of the first quadruple gravitationally lensed quasar candidate with Pan-STARRS
• Smooth matter and source size in microlensing simulations of gravitationally lensed quasars
• Cosmological Microlensing Statistics: Variability rates for Quasars and GRB Afterglows, and implications for macrolensing magnification bias and flux ratios
• The different origins of high- and low-ionization broad emission lines revealed by gravitational microlensing in the Einstein cross
• The evolution of late-type galaxies from CASSOWARY lensing systems
• Difference Imaging of Lensed Quasar Candidates in the SDSS Supernova Survey Region

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