Redshifts of the Gravitational Lenses MG 1131+0456 and B1938+666

Open Access

1 March 2000

journal article
research article
Published by American Astronomical Society in The Astronomical Journal

Vol. 119 (3) , 1078-1082
https://doi.org/10.1086/301273

Abstract

The redshifts of the gravitational lens galaxies in MG 1131+0456 and B1938+666 are 0.844 and 0.881, respectively. Both are early-type galaxies lying at the redshifts predicted by assuming that they are early-type galaxies with old stellar populations lying on the fundamental plane. We also find evidence for a foreground group of galaxies at z = 0.343 near MG 1131+0456. The source redshifts are predicted to be 1.8 in both systems, but they are so red that infrared spectra will be required to determine their redshifts.

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