Redshifts of the Gravitational Lenses MG 0414+0534 and MG 0751+2716

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Abstract
We report redshifts in two gravitational lens systems, MG 0414+0534 and MG 0751+2716. The lens galaxy in MG 0414+0534 lies at zl = 0.9584 ± 0.0002. The luminosity and extreme red color of the lens are thus typical of a passively evolving early-type ~2L* 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 zl = 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 zs = 3.200 ± 0.001 radio quasar. For flat universes with Ω0 = 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.
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