Matches in SemOpenAlex for { <https://semopenalex.org/work/W2048804865> ?p ?o ?g. }
- W2048804865 abstract "Most analysis of cosmic microwave background spherical harmonic coefficients ${a}_{ensuremath{ell}m}$ has focused on estimating the power spectrum ${C}_{ensuremath{ell}}=⟨|{a}_{ensuremath{ell}m}{|}^{2}⟩$ rather than the coefficients themselves. We present a minimum-variance method for measuring ${a}_{ensuremath{ell}m}$ given anisotropic noise, incomplete sky coverage and foreground contamination, and apply it to the Wilkinson Microwave Anisotropy Probe (WMAP) data. Our method is shown to constitute lossless data compression in the sense that the widely used quadratic estimators of the power spectrum ${C}_{ensuremath{ell}}$ can be computed directly from our ${a}_{ensuremath{ell}m}$-estimators. As the Galactic cut is increased, the error bars $ensuremath{Delta}{a}_{ensuremath{ell}m}$ on low multipoles go from being dominated by foregrounds to being dominated by leakage from other multipoles, with the intervening minimum defining the optimal cut. Applying our method to the WMAP quadrupole and octopole as an illustration, we investigate the robustness of the previously reported ``axis of evil'' alignment to Galactic cut and foreground contamination." @default.
- W2048804865 created "2016-06-24" @default.
- W2048804865 creator A5039767956 @default.
- W2048804865 creator A5091601455 @default.
- W2048804865 date "2006-07-13" @default.
- W2048804865 modified "2023-09-27" @default.
- W2048804865 title "CMB multipole measurements in the presence of foregrounds" @default.
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- W2048804865 doi "https://doi.org/10.1103/physrevd.74.023005" @default.
- W2048804865 hasPublicationYear "2006" @default.
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