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Title:
Detection of weak gravitational lensing distortions of distant galaxies by cosmic dark matter at large scales
Authors:
Wittman, David M.; Tyson, J. Anthony; Kirkman, David; Dell'Antonio, Ian; Bernstein, Gary
Affiliation:
AA(Bell Laboratories, Lucent Technologies , Murray Hill, New Jersey, 07574, USA), AB(Kitt Peak National Observatory, NOAO , Tucson, Arizona 85726, USA), AC(Astronomy Department, University of Michigan, Ann Arbor, Michigan 48109, USA), AD(Kitt Peak National Observatory, NOAO , Tucson, Arizona 85726, USA), AE(Astronomy Department, University of Michigan, Ann Arbor, Michigan 48109, USA)
Publication:
Nature, Volume 405, Issue 6783, pp. 143-148 (2000). (Nature Homepage)
Publication Date:
05/2000
Origin:
NATURE
Bibliographic Code:
2000Natur.405..143W

Abstract

Most of the matter in the Universe is not luminous, and can be observed only through its gravitational influence on the appearance of luminous matter. Weak gravitational lensing is a technique that uses the distortions of the images of distant galaxies as a tracer of dark matter: such distortions are induced as the light passes through large-scale distributions of dark matter in the foreground. The patterns of the induced distortions reflect the density of mass along the line of sight and its distribution, and the resulting `cosmic shear' can be used to distinguish between alternative cosmologies. But previous attempts to measure this effect have been inconclusive. Here we report the detection of cosmic shear on angular scales of up to half a degree using 145,000 galaxies and along three separate lines of sight. We find that the dark matter is distributed in a manner consistent with either an open universe, or a flat universe that is dominated by a cosmological constant. Our results are inconsistent with the standard cold-dark-matter model.
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