Evolution of the dark matter distribution with three-dimensional weak lensing

D. J. Bacon*, A. N. Taylor, M. L. Brown, M. E. Gray, C. Wolf, K. Meisenheimer, S. Dye, L. Wisotzki, A. Borch, M. Kleinheinrich

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We present a direct detection of the growth of large-scale structure, using weak gravitational lensing and photometric redshift data from the COMBO-17 survey. We use deep R-band imaging of two 0.5 × 0.5 deg 2 fields, affording shear estimates for over 52000 galaxies; we combine these with photometric redshift estimates from our 17-band survey, in order to obtain a 3D shear field. We find theoretical models for evolving matter power spectra and correlation functions, and fit the corresponding shear correlation functions to the data as a function of redshift. We detect the evolution of the power at the 4.7σ level given reasonable priors, and measure the rate of evolution for 0 < z < 1. We also fit correlation functions to our 3D data as a function of cosmological parameters σ 8 and ΩΛ- We find joint constraints on ΩΛ and σ 8, demonstrating an improvement in accuracy by ≃40 per cent over that available from 2D weak lensing for the same area.

Original languageEnglish
Pages (from-to)723-733
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume363
Issue number3
DOIs
Publication statusPublished - 1 Nov 2005

Keywords

  • Cosmological parameters
  • Dark matter
  • Gravitational lensing
  • Large-scale structure of Universe

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