Evolution of the Dark Matter Distribution with 3-D 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

doi:10.1111/j.1365-2966.2005.09420.x

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arXiv · astro-ph/0403384

Evolution of the Dark Matter Distribution with 3-D 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

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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 0.25 square degree 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 3-D 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 7.7 sigma level given minimal priors, and measure the rate of evolution for 0<z<1. We also fit correlation functions to our 3-D data as a function of cosmological parameters sigma_8 and Omega_Lambda. We find joint constraints on Omega_Lambda and sigma_8, demonstrating an improvement in accuracy by a factor of 2 over that available from 2D weak lensing for the same area.

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D. J. Bacon, A. N. Taylor, M. L. Brown, M. E. Gray, C. Wolf, K. Meisenheimer, S. Dye, L. Wisotzki, A. Borch, M. Kleinheinrich. 2004-03-16. Evolution of the Dark Matter Distribution with 3-D Weak Lensing. https://doi.org/10.1111/j.1365-2966.2005.09420.x

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