1998/09/05 by John L. Tonry, J. Tonry, C. S. Kochanek +1 · 5 citations
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Extinction (optical mineralogy) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gravitational lens #Luminosity #Optics #Physics #Quasar #Redshift #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/300834
9 pages, AASTeX Latex, including 5 Postscript figures, submitted to Astronomical Journal
arxiv created 1998/09/05 · openalex publication_date 1999/05/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report redshifts in two gravitational lens systems, MG 0414+0534 and MG 0751+2716. The lens galaxy in MG 0414+0534 lies at z l = 0.9584 ± 0.0002. The luminosity and extreme red color of the lens are thus typical of a passively evolving early-type ∼2 L * galaxy. The galaxy cannot have a significant global mean extinction without being anomalously luminous. The lens galaxy in MG 0751+2716 has a redshift of z l = 0.3502 ± 0.0003, and it is a member of a small group. The group includes the nearby bright companion galaxy whose redshift we confirmed to be z = 0.3501 ± 0.0001 and a nearby emission-line galaxy with z = 0.3505 ± 0.0003. A second emission-line galaxy with z = 0.5216 ± 0.0001 was found nearly superposed on the first emission-line galaxy. The source in MG 0751+2716 is a z s = 3.200 ± 0.001 radio quasar. For flat universes with Ω 0 = 1.0 (0.3), 96% (87%) of lenses like MG 0414+0534 and 7% (3%) of lenses like MG 0751+2716 are expected to have lower lens redshifts than observed.