Decomposition of the visible and dark matter in the Einstein ring 0047-2808 by semilinear inversion

We measure the mass density profile of the lens galaxy in the Einstein ring system 0047 - 2808 using our semilinear inversion method developed in an earlier paper. By introducing an adaptively gridded source plane, we are able to eliminate the need for regularization of the inversion. This removes the problem of a poorly defined number of degrees of freedom, encountered by inversion methods that employ regularization, and so allows a proper statistical comparison between models. We confirm previous results indicating that the source is double and that a power-law model gives a significantly better fit than the singular isothermal ellipsoid model. We measure a slope alpha = 2.11 +/- 0.04. We find, furthermore, that a dual-component constant M/L baryonic + dark halo model gives a significantly better fit than the power-law model, at the 99.7% confidence level. The inner logarithmic slope of the dark halo profile is found to be 0.87(-0.61)(+0.69) (95% CL), consistent with the predictions of cold dark matter simulations of structure formation. We determine an unevolved B-band mass-to-light ratio for the baryons ( only) of 3.05(-0.90)(+0.53) h(65) M-./ L-B. (95% CL). This is the first measurement of the baryonic M/L of a single galaxy by purely gravitational lens methods. The baryons account for 65(-18)(+10)% ( 95% CL) of the total projected mass, or, assuming spherical symmetry, 84(-24)(+12)% ( 95% CL) of the total three-dimensional mass within the mean radius of 1.'' 16 (7.5 h(65)(-1) kpc) traced by the ring. Finally, at the level of > 3 sigma, we find that the halo mass is rounder than the baryonic distribution and that the two components are offset in orientation from one another.