Power spectrum from weak-shear data

• Verfasst von: Bartelmann, Matthias [VerfasserIn]
• Verfasst von: Schneider, Peter [VerfasserIn]
• Titel: Power spectrum from weak-shear data
• Verf.angabe: Matthias Bartelmann and Peter Schneider
• E-Jahr: 1999
• Jahr: 10 Feb 1999
• Umfang: 4 S.
• Fussnoten: Gesehen am 28.09.2017
• Titel Quelle: Enthalten in: De.arxiv.org
• Ort Quelle: [S.l.] : Arxiv.org, 1991
• Jahr Quelle: 1999
• Band/Heft Quelle: (1999) Artikel-Nummer 9902152, 4 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Astrophysics
• K10plus-PPN: 156389159X

Abstract

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.