An Inversion Method for Measuring Beta in Large Redshift Surveys
摘要
A precision method for determining the value of Beta= Omega_m^{0.6}/b, where b is the galaxy bias parameter, is presented. In contrast to other existing techniques that focus on estimating this quantity by measuring distortions in the redshift space galaxy-galaxy correlation function or power spectrum, this method removes the distortions by reconstructing the real space density field and determining the value of Beta that results in a symmetric signal. To remove the distortions, the method modifies the amplitudes of a Fourier plane-wave expansion of the survey data parameterized by Beta. This technique is not dependent on the small-angle/plane-parallel approximation and can make full use of large redshift survey data. It has been tested using simulations with four different cosmologies and returns the value of Beta to +/- 0.031, over a factor of two improvement over existing techniques.
引用
@article{arxiv.astro-ph/0204499,
title = {An Inversion Method for Measuring Beta in Large Redshift Surveys},
author = {Stephen D. Landy and Alexander S. Szalay},
journal= {arXiv preprint arXiv:astro-ph/0204499},
year = {2009}
}
备注
16 pages including 6 figures Submitted to The Astrophysical Journal