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(abridged) We present Gemini integral-field unit (IFU) spectroscopy and Hubble Space Telescope (HST) F435W- and F814W-band images of a new four-image gravitational lens, SDSSJ140228. 22+632133. 3, obtained as part of an HST Snapshot program designed to expand the sample of known gravitational lenses amenable to detailed photometric, lensing, and dynamical studies. The lens is a smooth elliptical galaxy at a redshift of zₗ = 0. 2046 +/- 0. 0001 with a Sloan r-band magnitude of 17. 00 +/- 0. 05 and a stellar velocity dispersion of 267 +/- 17 km s^-1, obtained from its SDSS spectrum. Multiple emission lines place the quadruply-imaged source at a redshift of zₛ = 0. 4814 +/- 0. 0001. The best-fitting singular isothermal ellipsoid lens model gives an Einstein radius b = 1. 35" +/- 0. 05" (or 4. 9 +/- 0. 2 h₆5^-1 kpc), corresponding to a total mass of (30. 9 +/- 2. 3) x 10¹0 h₆5^-1 Mₛun within the critical curve. In combination with HST photometry this gives a rest-frame B-band mass-to-light ratio of (8. 1 +/- 0. 7) h₆5 times solar within the same region. The lens model predicts a luminosity-weighted stellar dispersion within the 3"-diameter SDSS aperture of sigma_* ~= 270 km s^-1, in good agreement with the observed value. Using the model to de-lens the four lensed images yields a source with a smooth, monotonically-decreasing brightness distribution.
Bolton et al. (Tue,) studied this question.