Redshifts of the Gravitational Lenses MG 0414+0534 and MG 0751+2716
Redshifts of the Gravitational Lenses MG 0414+0534 and MG 0751+2716
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引力透镜 MG 0414 0534 和 MG 0751 2716 的红移
DOI：
10.1086/300834
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
C. Kochanek
中科院分区：
文献类型：
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作者：
J. Tonry;C. Kochanek
本文报道了两个引力透镜系统MG 0414+0534和MG 0751+2716的红移。MG 0414+0534中的透镜星系位于zl = 0.9584 ± 0.0002。透镜的亮度和极端的红色因此是典型的被动演化的早期类型的E12L * 星系。银河系不可能有一个显着的全球平均消光没有被过度发光。MG 0751+2716中的透镜星系的红移为zl = 0.3502 ± 0.0003，是一个小星系群的成员。这个星系群包括附近的明亮伴星系，我们确认其红移为z = 0.3501 ± 0.0001，以及附近的发射线星系，z = 0.3505 ± 0.0003。发现z = 0.5216 ± 0.0001的第二个发射线星系几乎叠加在第一个发射线星系上。MG 0751+2716的源是一个zs = 3.200 ± 0.001的射电类星体。对于Ω0 = 1.0（0.3）的平坦宇宙，96%（87%）的透镜（如MG 0414+0534）和7%（3%）的透镜（如MG 0751+2716）预期具有比观测到的更低的透镜红移。
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.