EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 458/2 Article
Free access article

Issue A&A
Volume 458, Number 2, November I 2006
Page(s) 349 - 356
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361:20054582



A&A 458, 349-356 (2006)
DOI: 10.1051/0004-6361:20054582

Combining weak and strong lensing in cluster potential reconstruction

M. Cacciato1, 2, M. Bartelmann3, M. Meneghetti3 and L. Moscardini1, 4

1  Dipartimento di Astronomia, Università di Bologna, via Ranzani 1, 40127 Bologna, Italy
    e-mail: marcello.cacciato@studio.unibo.it
2  Max-Planck-Institut für Astronomie, Königstuhl  17, 69117 Heidelberg, Germany
3  Zentrum für Astronomie, ITA, Universität Heidelberg, Albert-Überle-Str. 2, 69120 Heidelberg, Germany
4  INFN, Sezione di Bologna, Italy

(Received 24 November 2005 / Accepted 2 August 2006)

Abstract
We propose a method for recovering the two-dimensional gravitational potential of galaxy clusters which combines data from weak and strong gravitational lensing. A first estimate of the potential from weak lensing is improved at the approximate locations of critical curves. The method can be fully linearised and does not rely on the existence and identification of multiple images. We use simulations to show that it recovers the surface-mass density profiles and distributions very accurately,even if critical curves are only partially known and if their location is realistically uncertain. We further describe how arcs at different redshifts can be combined, and how deviations from weak lensing can be included.


Key words: gravitational lensing -- galaxies: clusters: general -- cosmology: theory



© ESO 2006


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.