The Lensing Galaxy in MG1549+3047
  We have measured a velocity dispersion for the foreground galaxy in this gravitationally lensed system. Our dispersion confirms the prediction from lens models, provided that the source is distant enough ($z_{_S}>0.2$). Current interpretations of lensing statistics depend sensitively on how the optical and mass dispersions are related. For $z_{_S}>0.5$, our observations favor $\sigma_{mass}/\sigma_{opt}\simeq1$, but our uncertainties prevent us from clearly distinguishing between dynamical models. We could not obtain a unique mass profile from lensing constraints, but models with a constant mass-to-light ratio are possible. We also found unusual rotation in the lensing galaxy, and confirmed its redshift. 
J.Lehar (CfA), A.J.Cooke (ROE Edinburgh), C.R.Lawrence (JPL)   A.D.Silber (U.Washington), G.I.Langston (NRAO Greenbank)