Pure pseudo-C_l estimators for CMB B-modes

Details Pure pseudo-C_l estimators for CMB B-modes Pure pseudo-C_l estimators for CMB B-modes

2006-08-30

arxiv.org/abs/astro-ph/0608662v1

New Astron.Rev.50:1025-1029,2006

Astronomy and Astrophysics

Astrophysics

9 pages and 3 figures; Proceedings of the Fundamental Physics With CMB workshop, UC Irvine, March 23-25, 2006, to be published

Scientific paper

10.1016/j.newar.2006.09.015

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.

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