Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-08-11
Astron.Astrophys.419:565,2004
Astronomy and Astrophysics
Astrophysics
uses aa.cls, 13 pages, 1 figure, preprint, replaced to correct paper layout
Scientific paper
10.1051/0004-6361:20034185
We estimate the effects of low temporal frequency modes in the time stream on sky maps such as expected from the PLANCK experiment -- a satellite mission designed to image the sky in the microwave band. We perform the computations in a semi-analytic way based on a simple model of PLANCK observations, which permits an insight into the structure of noise correlations of PLANCK-like maps, without doing exact, computationally intensive numerical calculations. We show that, for a set of plausible scanning strategies, marginalization over temporal frequency modes with frequencies lower than the spin frequency of the satellite (= 1/60 Hz) causes a nearly negligible deterioration of a quality of the resulting sky maps. We point out that this observation implies that it should be possible to successfully remove effects of long-term time domain parasitic signals from the PLANCK maps during the data analysis stage.
Stompor Radek
White Martin
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