Discovery of Four Doubly Imaged Quasar Lenses from the Sloan Digital Sky Survey

Abstract

We report the discovery of four doubly imaged quasar lenses. All the four systems are selected as lensed quasar candidates from the Sloan Digital Sky Survey data. We confirm their lensing hypothesis with additional imaging and spectroscopic follow-up observations. The discovered lenses are SDSS J0743+2457 with the source redshift z_s=2.165, the lens redshift z_l=0.381, and the image separation theta=1.034", SDSS J1128+2402 with z_s=1.608 and theta=0.844", SDSS J1405+0959 with z_s=1.810, z_l~0.66, and theta=1.978", and SDSS J1515+1511 with z_s=2.054, z_l=0.742, and theta=1.989". It is difficult to estimate the lens redshift of SDSS J1128+2402 from the current data. Two of the four systems (SDSS J1405+0959 and SDSS J1515+1511) are included in our final statistical lens sample to derive constraints on dark energy and the evolution of massive galaxies.

20 pages, 4 figures, submitted to AJ

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• The 2.5 m Telescope of the Sloan Digital Sky Survey
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• The Spatial Structure of An Accretion Disk
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• Deep and rapid observations of strong-lensing galaxy clusters within the sky localisation of GW170814
• A Search for Gravitationally Lensed Quasars and Quasar Pairs in Pan-STARRS1: Spectroscopy and Sources of Shear in the Diamond 2M1134$-$2103
• New database for a sample of optically bright lensed quasars in the northern hemisphere
• Doubly imaged quasar SDSS J1515+1511: time delay and lensing galaxies
• Adaptive optics observations of the gravitationally lensed quasar SDSS J1405+0959
• High-resolution imaging follow-up of doubly imaged quasars
• Strange Quasar Candidates with Abnormal Astrometric Characteristics from Gaia EDR3 and SDSS (SQUAB-II): Optical Identifications
• Model selection using time-delay lenses
• Multiphase Powerful Outflows Detected in High-z Quasars
• New Dynamical Measurements from a Lensed Quasar Sample: Joint Analysis Constrains the Mass Profile Evolution of Lens Galaxies