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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 358701.0, MPI für Astronomie / Publikationen_mpia
Cosmological constraints from COMBO-17 using 3D weak lensing
Authors:Kitching, T. D.; Heavens, A. F.; Taylor, A. N.; Brown, M. L.; Meisenheimer, K.; Wolf, C.; Gray, M. E.; Bacon, D. J.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:Monthly Notices of the Royal Astronomical Society
Start Page:771
End Page:778
Audience:Not Specified
Abstract / Description:We present the first application of the 3D cosmic shear method developed in Heavens, Kitching & Taylor and the geometric shear-ratio analysis developed in Taylor et al., to the COMBO-17 data set. 3D cosmic shear has been used to analyse galaxies with redshift estimates from two random COMBO-17 fields covering 0.52 deg2 in total, providing a conditional constraint in the (sigma8, Omegam) plane as well as a conditional constraint on the equation of state of dark energy, parametrized by a constant w ≡ pde/rhodec2. The (sigma8, Omegam) plane analysis constrained the relation between sigma8 and Omegam to be sigma8(Omegam/0.3)0.57+/-0.19 = 1.06+0.17-0.16, in agreement with a 2D cosmic shear analysis of COMBO-17. The 3D cosmic shear conditional constraint on w using the two random fields is w = -1.27+0.64-0.70. The geometric shear-ratio analysis has been applied to the A901/2 field, which contains three small galaxy clusters. Combining the analysis from the A901/2 field, using the geometric shear-ratio analysis, and the two random fields, using 3D cosmic shear, w is conditionally constrained to w = -1.08+0.63-0.58. The errors presented in this paper are shown to agree with Fisher matrix predictions made in Heavens, Kitching & Taylor and Taylor et al. When these methods are applied to large data sets, as expected soon from surveys such as Pan-STARRS and VST-KIDS, the dark energy equation of state could be constrained to an unprecedented degree of accuracy.
Free Keywords:gravitational lensing ; cosmology: observations
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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