Destriping CMB temperature and polarization maps

¹ University of Helsinki, Department of Physics, PO Box 64, 00014 Helsinki, Finland e-mail: hannu.kurki-suonio@helsinki.fi
² Helsinki Institute of Physics, PO Box 64, 00014 Helsinki, Finland
³ Metsähovi Radio Observatory, Helsinki University of Technology, Metsähovintie 114, 02540 Kylmälä, Finland
⁴ Dipartimento di Fisica, Universitá di Milano, via Celoria 16, 20131, Milano, Italy
⁵ INAF/IASF-BO, Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna, via Gobetti 101, 40129, Bologna, Italy
⁶ Dipartimento di Fisica, Università degli Studi di Ferrara, via Saragat 1, 44100 Ferrara, Italy

Received: 21 April 2009
Accepted: 14 August 2009

Abstract

We study destriping as a map-making method for temperature-and-polarization data for cosmic microwave background observations. We present a particular implementation of destriping and study the residual error in output maps, using simulated data corresponding to the 70 GHz channel of the Planck satellite, but assuming idealized detector and beam properties. The relevant residual map is the difference between the output map and a binned map obtained from the signal + white noise part of the data stream. For destriping it can be divided into six components: unmodeled correlated noise, white noise reference baselines, reference baselines of the pixelization noise from the signal, and baseline errors from correlated noise, white noise, and signal. These six components contribute differently to the different angular scales in the maps. We derive analytical results for the first three components. This study is related to Planck LFI activities.