Discovery of Four Gravitationally Lensed Quasars from the Sloan Digital Sky Survey

Abstract

We present the discovery of four gravitationally lensed quasars selected from the spectroscopic quasar catalog of the Sloan Digital Sky Survey. We describe imaging and spectroscopic follow-up observations that support the lensing interpretation of the following four quasars: SDSS J0832+0404 (image separation θ=1.98", source redshift z_s=1.115, lens redshift z_l=0.659); SDSS J1216+3529 (θ=1.49", z_s=2.012); SDSS J1322+1052 (θ=2.00", z_s=1.716); and SDSS J1524+4409 (θ=1.67", z_s=1.210, z_l=0.320). Each system has two lensed images. We find that the fainter image component of SDSS J0832+0404 is significantly redder than the brighter component, perhaps because of differential reddening by the lensing galaxy. The lens potential of SDSS J1216+3529 might be complicated by the presence of a secondary galaxy near the main lensing galaxy.

25 pages, 10 figures, 6 tables, accepted for publication in AJ

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• The Sloan Digital Sky Survey Quasar Lens Search. IV. Statistical Lens Sample from the Fifth Data Release
• Five New High-Redshift Quasar Lenses from the Sloan Digital Sky Survey
• Statistics of Galactic-Scale Quasar Pairs at Cosmic Noon
• Streamlined Lensed Quasar Identification in Multiband Images via Ensemble Networks
• TDCOSMO XVII. New time delays in 22 lensed quasars from optical monitoring with the ESO-VST 2.6m and MPG 2.2m telescopes
• Accelerating lensed quasar discovery and modeling with physics-informed variational autoencoders
• Model selection using time-delay lenses
• Milky-Way-like stars in a galaxy core 8 billion years ago revealed by gravitational lensing