Fast quadratic power spectrum estimators and the E–B decomposition |
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Authors: | Anthony Challinor Gayoung Chon Eric Hivon Simon Prunet Istvn Szapudi |
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Institution: | a Astrophysics Group, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, UK;b Infrared Processing and Analysis Center, Caltech, 770 South Wilson Avenue, Pasadena, CA 91125, USA;c Institut d’Astrophysique de Paris, 98bis, Boulevard Arago, 75014, Paris, France;d Institute for Astronomy, University of Hawaii, 2680 Woodlawn Dr, Honolulu, HI 96822, USA |
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Abstract: | We describe a fast, quadratic power spectrum estimator for cosmic microwave background polarization fields, based on heuristically-weighted correlation functions. The method can handle real-world effects such as inhomogeneous or correlated noise, and arbitrary sky cuts. A significant feature is that the electric and magnetic polarization powers are separated exactly in the mean, even for observations covering only a small region of the sky, and with a negligible increase in computational cost. The method is illustrated with simulations for a large-area survey, and a future, deep magnetic-polarization survey. |
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