In a previous paper , we outlined a new Bayesian method for inferring the properties of extended gravitational lenses , given data in the form of resolved images .
This method holds the most promise for optimally extracting information from the observed image , whilst providing reliable uncertainties in all parameters .
Here , we apply the method to the well studied optical Einstein ring 0047-2808 .
Our results are in broad agreement with previous studies , showing that the density profile of the lensing galaxy is aligned within a few degrees of the light profile , and suggesting that the source galaxy ( at redshift 3.6 ) is a binary system , although its size is only of order 1-2 kpc .
We also find that the mass of the elliptical lensing galaxy enclosed by the image is ( 2.91 \pm 0.01 ) \times 10 ^ { 11 } M _ { \sun } .
Our method is able to achieve improved resolution for the source reconstructions , although we also find that some of the uncertainties are greater than has been found in previous analyses , due to the inclusion of extra pixels and a more general lens model .