Circular scans for cosmic microwave background anisotropy observation and analysis |
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| Authors: | J Delabrouille K M Górski & E Hivon |
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| Institution: | Institut d'Astrophysique Spatiale, CNRS &38;UniversitéParis XI, bât 121, 91405 Orsay Cedex, France,;Enrico Fermi Institute, University of Chicago, 5460 South Ellis Avenue, Chicago, ILL 60637, USA,;Theoretical Astrophysics Center, Juliane Maries Vej 30, DK-2100, Copenhagen, Denmark,;On leave from Warsaw University Observatory, Warsaw, Poland |
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| Abstract: | A number of experiments for measuring anisotropies of the cosmic microwave background (CMB) use scanning strategies in which temperature fluctuations are measured along circular scans on the sky. It is possible, from a large number of such intersecting circular scans, to build two-dimensional sky maps for subsequent analysis. However, since instrumental effects — especially the excess low-frequency 1/ f noise — project on to such two-dimensional maps in a non-trivial way, we discuss the analysis approach which focuses on information contained in the individual circular scans. This natural way of looking at CMB data from experiments scanning on the circles combines the advantages of elegant simplicity of Fourier series for the computation of statistics useful for constraining cosmological scenarios, and superior efficiency in analysing and quantifying most of the crucial instrumental effects. |
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| Keywords: | methods: data analysis methods: observational cosmic microwave background cosmology: theory |
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