Volume 534, October 2011
|Number of page(s)||19|
|Published online||10 October 2011|
Iterative destriping and photometric calibration for Planck-HFI, polarized, multi-detector map-making
Laboratoire de l’Accélérateur Linéaire, Université Paris-Sud, CNRS/IN2P3, 91898 Orsay, France
2 Laboratoire Astroparticule et Cosmologie, Université Paris-7 Denis Diderot, CNRS/IN2P3, Paris, France
Received: 11 March 2011
Accepted: 20 July 2011
We present an iterative scheme designed to recover calibrated I, Q, and U maps from Planck-HFI data using the orbital dipole due to the satellite motion with respect to the Solar System frame. It combines a map reconstruction, based on a destriping technique, juxtaposed with an absolute calibration algorithm. We evaluate systematic and statistical uncertainties incurred during both these steps with the help of realistic, Planck-like simulations containing CMB, foreground components and instrumental noise, and assess the accuracy of the sky map reconstruction by considering the maps of the residuals and their spectra. In particular, we discuss destriping residuals for polarization sensitive detectors similar to those of Planck-HFI under different noise hypotheses and show that these residuals are negligible (for intensity maps) or smaller than the white noise level (for Q and U Stokes maps), for ℓ > 50. We also demonstrate that the combined level of residuals of this scheme remains comparable to those of the destriping-only case except at very low ℓ where residuals from the calibration appear. For all the considered noise hypotheses, the relative calibration precision is on the order of a few 10-4, with a systematic bias of the same order of magnitude.
Key words: cosmology: observations / cosmic background radiation / techniques: photometric / methods: data analysis / techniques: polarimetric
© ESO, 2011
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