Power spectrum from weak-shear data

Details Power spectrum from weak-shear data Power spectrum from weak-shear data

1999-02-10

arxiv.org/abs/astro-ph/9902152v1

Astronomy and Astrophysics

Astrophysics

4 pages including 4 figures. Accepted for publication in Astronomy & Astrophysics

Scientific paper

We demonstrate that the aperture mass as a measure for cosmic shear closely approximates (to better than ~5%) the scaled and shifted power spectrum of the projected mass density. This cosmological weak-lensing information can thus be used to directly infer the projected matter power spectrum with high accuracy. As an application, we show that aperture-mass observations can be used to constrain the cosmic density parameter and the power-spectrum amplitude. We show that, for a particular example, it should be possible to constrain Omega_0 to within ~ +/- 27%, and sigma_8 to within ~ +/- 8% using weak-shear data on a square-shaped field of 8 degrees side length.

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