Removing real-world foregrounds from CMB maps

Details Removing real-world foregrounds from CMB maps Removing real-world foregrounds from CMB maps

1997-12-03

arxiv.org/abs/astro-ph/9712038v2

ApJ, 502, 1-6 (1998)

Astronomy and Astrophysics

Astrophysics

Expanded with wavelet discussion. Matches accepted ApJ version. 6 pages, with 3 figs included. Color figures and links at ht

Scientific paper

10.1086/305905

Most work on foreground removal has treated the case where the frequency dependence of all components is perfectly known and independent of position. In contrast, real-world foregrounds are generally not perfectly correlated between frequencies, with the spectral index varying slightly with position and (in the case of some radio sources) with time. A method incorporating this complication in presented, and illustrated with an application to the upcoming satellite missions MAP and Planck. We find that even spectral index variations as small as 0.1 can have a substantial impact on how channels should be combined and on attainable accuracy.

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