Issue |
A&A
Volume 419, Number 2, May IV 2004
|
|
---|---|---|
Page(s) | 783 - 792 | |
Section | Astronomical instrumentation | |
DOI | https://doi.org/10.1051/0004-6361:20034185 | |
Published online | 03 May 2004 |
The effects of low temporal frequency modes on minimum variance maps from PLANCK*
1
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, radek@cfpa.berkeley.edu
Received:
12
August
2003
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
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