Non-parametric mass profiles of a unique elliptical galaxy at a redshift of 1

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Valls-Gabaud, D.
Cabanac, R.
Lidman, C.
Diego, J. M.
Saha, P.

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The serendipitous discovery of a gravitational lens system formed by an elliptical galaxy at z ∼ 1 and a post-starburst galaxy at z ∼ 3.8 brings a unique opportunity to study in detail the mass profile of a massive and relaxed object at a look back time of half the age of the universe. We sketch here a comparison of different methods to reconstruct the mass of the lens, both parametrically and non-parametrically, highlighting their advantanges and limitations.

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