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Title:
Mapping the dark matter with weak gravitational lensing
Authors:
Kaiser, Nick; Squires, Gordon
Affiliation:
AA(Canadian Inst. for Theoretical Astrophysics, Toronto, Canada), AB(Canadian Inst. for Theoretical Astrophysics, Toronto, Canada)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 404, no. 2, p. 441-450. (ApJ Homepage)
Publication Date:
02/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Cosmology, Dark Matter, Galactic Clusters, Gravitational Lenses, Ellipticity, Galactic Mass, Mass Distribution
DOI:
10.1086/172297
Bibliographic Code:
1993ApJ...404..441K

Abstract

We consider the problem of reconstructing the projected mass distribution in clusters from coherent distortions of background galaxies. The ellipticity of a background galaxy provides an estimate of the trace-free components of the tidal field. We present a technique for inverting this problem. The resulting surface density contains a strong, but incoherent, random component arising from the random intrinsic galaxy ellipticities. This can be removed by filtering. Our method is very similar in form to that of Tyson et al. (1990), and the latter is given a rigorous interpretation as a particular implementation of filtering. We present simulations to illustrate the application of the method.

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