Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 343, Issue 2, Pages L29-L32Publisher
OXFORD UNIV PRESS
DOI: 10.1046/j.1365-8711.2003.06858.x
Keywords
gravitational lensing; galaxies : elliptical and lenticular, cD; galaxies : fundamental parameters; galaxies : kinematics and dynamics; distance scale
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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 (z (s) = 1.170 +/- 0.001) and an intermediate-redshift lensed spiral galaxy (z (G2) = 0.604 +/- 0.001). The source redshift allows us to determine the mass of the SB0 lens galaxy enclosed by the Einstein radius (R (E) = 1.15 +/- 0.05 arcsec): M (E) equivalent toM (
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