EDP Sciences
Free access
Issue
A&A
Volume 419, Number 2, May IV 2004
Page(s) 783 - 792
Section Instruments, observational techniques, and data processing
DOI http://dx.doi.org/10.1051/0004-6361:20034185


A&A 419, 783-792 (2004)
DOI: 10.1051/0004-6361:20034185

The effects of low temporal frequency modes on minimum variance maps from PLANCK

R. Stompor1 and M. White2

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

(Received 12 August 2003 / Accepted 17 February 2004)

Abstract
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 ( $\simeq $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

Offprint request: R. Stompor, radek@cfpa.berkeley.edu




© ESO 2004