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Title

Weak gravitational lensing in different cosmologies, using an algorithm for shear in three dimensions

Author(s)

Barber, Andrew J.;  Thomas, Peter A.;  Couchman, M. P.;  Fluke, C. J.

Abstract

We present the results of weak gravitational lensing statistics in four different cosmological N-body simulations. The data have been generated using an algorithm for the three-dimensional shear, which makes use of a variable softening facility for the N-body particle masses, and enables a physical interpretation for the large-scale structure to be made. Working in three dimensions also allows the correct use of the appropriate angular diameter distances. Our results are presented on the basis of the filled-beam approximation in view of the variable particle softening scheme in our algorithm. The importance of the smoothness of matter in the Universe for the weak lensing results is discussed in some detail. The low-density cosmology with a cosmological constant appears to give the broadest distributions for all the statistics computed for sources at high redshifts. In particular, the range in magnification values for this cosmology has implications for the determination of the cosmological parameters from high-redshift type Ia supernovae. The possibility of determining the density parameter from the non-Gaussianity in the probability distribution for the convergence is discussed.

Publication type

Journal article

Research centre

Swinburne University of Technology. Centre for Astrophysics and Supercomputing

Source

Monthly Notices of the Royal Astronomical Society, Vol. 319, no. 1 (Nov 2000), pp. 267-288

Publication year

2000

Keyword(s)

Cluster galaxies;  Cosmology;  Gravitational lensing;  Large-scale structure of Universe;  Numerical methods

Publisher

Blackwell

ISSN

0035-8711

Publisher URL

http://dx.doi.org/10.1046/j.1365-8711.2000.03864.x

Copyright

Copyright © 2000 The Royal Astronomical Society. The accepted manuscript of the paper is reproduced here in accordance with the copyright policy of the publisher. The definitive version is available at www.interscience.wiley.com.

Full text

Peer reviewed