2007/08/31 by Masamune Oguri, Naohisa Inada, Alejandro Clocchiatti +9 · 2 citations
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Astrophysics #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gravitational lens #Lens (geology) #Optics #Physics #Quasar #Redshift #Sky #astro-ph
paper · pdf · doi:10.1088/0004-6256/135/2/520
published as Astron.J.135:520-526,2008 · 25 pages, 10 figures, 6 tables, accepted for publication in AJ
arxiv created 2007/11/25 · openalex publication_date 2008/01/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present the discovery of four gravitationally lensed quasars selected from the spectroscopic quasar catalog of the Sloan Digital Sky Survey (SDSS). 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.