The redshift of the Einstein ring in MG 1549+305
T. TreuCalifornia Institute of Technology , Astronomy , Mail code 105-24 , Pasadena , CA 91125 , USAL. V. E. KoopmansCalifornia Institute of Technology , Theoretical Astrophysics , Mail code 130-33 , Pasadena , CA 91125 , USA
2003en
ABI
Abstract
A deep spectrum taken with the Echelle Spectrograph and Imager (ESI) at the Keck II Telescope as part of the Lenses Structure and Dynamics (LSD) Survey reveals the redshifts of the extremely red source of the radio Einstein ring in the gravitational lens system MG 1549+305 (zs= 1.170 ± 0.001) and an intermediate-redshift lensed spiral galaxy (zG2= 0.604 ± 0.001). The source redshift allows us to determine the mass of the SB0 lens galaxy enclosed by the Einstein radius (RE= 1.15 ± 0.05 arcsec): ME≡M(
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