Pure pseudo-C_l estimators for CMB B-modes
Astrophysics
2011-04-11 v1
Abstract
Fast heuristically weighted, or pseudo-C_l, estimators are a frequently used method for estimating power spectra in CMB surveys with large numbers of pixels. Recently, Challinor & Chon showed that the E-B mixing in these estimators can become a dominant contaminant at low noise levels, ultimately limiting the gravity wave signal which can be detected on a finite patch of sky. We define a modified version of the estimators which eliminates E-B mixing and is near-optimal at all noise levels.
Keywords
Cite
@article{arxiv.astro-ph/0608662,
title = {Pure pseudo-C_l estimators for CMB B-modes},
author = {Kendrick M. Smith},
journal= {arXiv preprint arXiv:astro-ph/0608662},
year = {2011}
}
Comments
9 pages and 3 figures; Proceedings of the Fundamental Physics With CMB workshop, UC Irvine, March 23-25, 2006, to be published in New Astronomy Reviews