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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/9129

Title: Non-parametric strong lens inversion of Cl 0024+1654: illustrating the monopole degeneracy
Authors: LIESENBORGS, Jori
BEKAERT, Philippe
DE RIJCKE, Sven
DEJONGHE, Herwig
Issue Date: 2008
Publisher: WILEY-BLACKWELL PUBLISHING, INC, COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
Citation: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 389(1). p. 415-422
Abstract: The cluster lens Cl 0024+1654 is undoubtedly one of the most beautiful examples of strong gravitational lensing, providing five large images of a single source with well-resolved substructure. Using the information contained in the positions and the shapes of the images, combined with the null space information, a non-parametric technique is used to infer the strong lensing mass map of the central region of this cluster. This yields a strong lensing mass of 1.60 x 10(14) M-circle dot within a 0.5 arcmin radius around the cluster centre. This mass distribution is then used as a case study of the monopole degeneracy, which may be one of the most important degeneracies in gravitational lensing Studies and which is extremely hard to break. We illustrate the monopole degeneracy by adding circularly symmetric density distributions with zero total mass to the original mass map of Cl 0024+1654. These redistribute mass in certain areas of the mass map without affecting the observed images in any way. We show that the monopole degeneracy and the mass-sheet degeneracy together lie at the heart of the discrepancies between different gravitational lens reconstructions that can be found in the literature for a given object, and that many images/sources, with an overall high image density in the lens plane, are required to construct an accurate, high-resolution mass map based on strong lensing data.
Notes: Addresses: 1. Univ Hasselt, Expertisectr Digitale Media, B-3590 Diepenbeek, Belgium 2. Univ Ghent, Sterrenkundig Observ, B-9000 Ghent, Belgium E-mail Addresses: jori.liesenborgs@uhasselt.be
URI: http://hdl.handle.net/1942/9129
ISI #: 000270677800042
ISSN: 0035-8711
Category: A1
Type: Journal Contribution
Validation: ecoom, 2010
Appears in Collections: Research publications

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