The effects of low temporal frequency modes on minimum variance maps from PLANCK*
Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA
2 Departments of Astronomy & Physics, University of California, Berkeley, CA 94720, USA
Corresponding author: R. Stompor, firstname.lastname@example.org
Accepted: 17 February 2004
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.
Key words: methods: data analysis / cosmology: cosmic microwave background
© ESO, 2004