Beating Lensing Cosmic Variance with Galaxy Tomography
摘要
I discuss the use of cross correlations between galaxies with distance information and projected weak lensing dark matter maps to obtain a fully three dimensional dark matter map and power spectrum. On large scales l<100 one expects the galaxies to be biased, but not stochastic. I show that this allows a simultaneous solution of the full 3-D evolving galaxy bias and the dark matter power spectrum simultaneously. Within the photo-z information of the CFH lensing legacy survey, this allows a threefold reduction of statistical error, while a cross correlation with CLAR or other deep spectroscopic surveys allows a tenfold improvement in dark matter power accuracy on linear scales. This makes lensing surveys more sensitive to the cosmic equation of state and the neutrino masses.
关键词
引用
@article{arxiv.astro-ph/0402008,
title = {Beating Lensing Cosmic Variance with Galaxy Tomography},
author = {Ue-Li Pen},
journal= {arXiv preprint arXiv:astro-ph/0402008},
year = {2009}
}
备注
minor revisions resulting in larger error bars, 5 pages, 1 figure