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A Redshift for the First Einstein Ring, MG 1131+0456

8 Jul 2020, 16:00 UTC
A Redshift for the First Einstein Ring, MG 1131+0456
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Daniel Stern and Dominic J. Walton 2020 ApJL 895 L38
Archival Keck data are used to identify for the first time, from a detected emission line, the spectroscopic redshift for the source gravitationally lensed into the first Einstein ring ever detected: MG 1131+0456.

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