Evolution of the Dark Matter Distribution with 3-D Weak Lensing
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.
Cite
@article{arxiv.astro-ph/0403384,
title = {Evolution of the Dark Matter Distribution with 3-D Weak Lensing},
author = {D. J. Bacon and A. N. Taylor and M. L. Brown and M. E. Gray and C. Wolf and K. Meisenheimer and S. Dye and L. Wisotzki and A. Borch and M. Kleinheinrich},
journal= {arXiv preprint arXiv:astro-ph/0403384},
year = {2009}
}
Comments
11 pages, 4 figures; submitted to MNRAS