Strong and weak lensing united

Details Strong and weak lensing united Strong and weak lensing united

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...437...39b&link_type=abstract

Astronomy and Astrophysics, Volume 437, Issue 1, July I 2005, pp.39-48

Astronomy and Astrophysics

Astrophysics

35

Cosmology: Dark, Matter, Galaxies: Clusters: General, Gravitational Lensing

Scientific paper

Weak gravitational lensing is considered to be one of the
most powerful tools to study the mass and the mass distribution of
galaxy clusters. However, the mass-sheet degeneracy transformation
has limited its success. We present a novel method for a cluster
mass reconstruction which combines weak and strong lensing
information on common scales and can, as a consequence, break the
mass-sheet degeneracy. We extend the weak lensing formalism to the
inner parts of the cluster and combine it with the constraints from
multiple image systems. We demonstrate the feasibility of the method
with simulations, finding an excellent agreement between the input
and reconstructed mass also on scales within and beyond the Einstein
radius. Using a single multiple image system and photometric
redshift information of the background sources used for weak and
strong lensing analysis, we find that we are effectively able to
break the mass-sheet degeneracy, therefore removing one of the
main limitations on cluster mass estimates. We conclude that with
high resolution (e.g. HST) imaging data the method can more
accurately reconstruct cluster masses and their profiles than
currently existing lensing techniques.

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