A model for the gravitational lens system 2237+0305

We construct a mass model for the lensing spiral galaxy (z~0.039) in the 2237+0305 system that successfully accounts for most of the known properties of the four QSO (z~1.7) images. Both a de Vaucouleurs law and a King profile mass distribution work well in reproducing the observed image positions. The fluxes are not as well fit, but the observed fluxes should be affected by extinction within the foreground spiral galaxy, and may be affected by microlensing as well. The galaxy scale length and velocity dispersion for both models are consistent with the observed properties of other nearby spiral galaxies of similar morphological type. We recompute the a priority probability of serendipitously discovering a lensed QSO in the spectrum of a nearby galaxy to be less than 1%.

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