Issue EAS Publications Series Volume 20, 2006 Mass Profiles and Shapes of Cosmological Structures Page(s) 149 - 152 DOI 10.1051/eas:2006062 Published online 19 May 2006

Mass Profiles and Shapes of Cosmological Structures
G.A. Mamon, F. Combes, C. Deffayet and B. Fort (eds)
EAS Publications Series, 20 (2006) 149-152
DOI: 10.1051/eas:2006062

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

D. Valls-Gabaud¹, R. Cabanac¹, C. Lidman², J.M. Diego³ and P. Saha<sup>4

1</sup>  Canada-France-Hawaii Telescope, Kamuela, Hawaii 96743, USA
²  European Southern Observatory, Santiago 19001, Chile
³  MIT Kavli Institute for Astrophysics, MIT, Cambridge, MA 02139, USA
⁴  Astronomy Unit, Queen Mary College, University of London, London E1 4NS, UK

Abstract
The serendipitous discovery of a gravitational lens system formed by an elliptical galaxy at and a post-starburst galaxy at 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.

© EAS, EDP Sciences 2006

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