PLANCK: Systematic effects induced by periodic fluctuations of arbitrary shape

Abstract

Abstract.A fundamental requirement in the new generation of high resolution Cosmic Microwave Background imaging experiments is a strict control of systematic errors that must be kept at µK level in the final maps. Some of these errors are of celestial origin, while others will be generated by periodic fluctuations of the satellite environment. These environment instabilities will cause fluctuations in the measured signal output thus generating correlated effects in the reconstructed maps. In this paper we present an analytical study of the impact of periodic signal fluctuations on the measured sky maps produced by the Planck survey. In particular we show how it is possible to estimate analytically the damping factor of the peak-to-peak amplitude of the fluctuation at the instrument output after the projection in the final maps.

Planckpre-launch status: Low Frequency Instrument calibration and expected scientific performance

“…Fluctuations at the interface between the sorption cooler and the LFI were measured to be about 100 mK peak-to-peak. Using methods described in Mennella et al (2002), we infer that the effect of these fluctuations will be less than 1 μK per pixel in the maps, in line with the scientific requirements outlined in Bersanelli et al (2010).…”

Effect of Fourier filters in removing periodic systematic effects from CMB data

“…Further details about this analytical description and a comparison with simulations performed in the context of Planck can be found in Mennella et al (2002).…”

Planckpre-launch status: Design and description of the Low Frequency Instrument

“…Spin synchronous (0.016 Hz) components are not damped by scanning redundancy, and impose the most stringent limits on systematic effects. Periodic fluctuations on time scales other than the satellite spin are damped with an efficiency that depends on the characteristic time scale of the effect (see Mennella et al 2002a, for quantitative analysis). For 1/ f and thermal non-spin-synchronous fluctuations, affecting long time scales, we set the acceptable limits on systematic effects assuming that a consolidated destriping algorithm is applied to the data (Maino et al 1999(Maino et al , 2002.…”

“…Based on these transfer functions and on the topology of the LFI receiver discussed above, we developed a detailed analytical description of the receiver and evaluated its susceptibility to systematic effects by studying the impact of deviation from ideal radiometer behaviour on the differenced output (Seiffert et al 2002;Mennella et al 2002a). In addition to the analytical treatment, a numerical model of the RCA signals has been developed ).…”