Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-04-15
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
accepted by Astronomy&Astrophysics
Scientific paper
The High Frequency Instrument of Planck will map the entire sky in the millimeter and sub-millimeter domain from 100 to 857 GHz with unprecedented sensitivity to polarization ($\Delta P/T_{\tiny cmb} \sim 4\cdot 10^{-6}$) at 100, 143, 217 and 353 GHz. It will lead to major improvements in our understanding of the Cosmic Microwave Background anisotropies and polarized foreground signals. Planck will make high resolution measurements of the $E$-mode spectrum (up to $\ell \sim 1500$) and will also play a prominent role in the search for the faint imprint of primordial gravitational waves on the CMB polarization. This paper addresses the effects of calibration of both temperature (gain) and polarization (polarization efficiency and detector orientation) on polarization measurements. The specific requirements on the polarization parameters of the instrument are set and we report on their pre-flight measurement on HFI bolometers. We present a semi-analytical method that exactly accounts for the scanning strategy of the instrument as well as the combination of different detectors. We use this method to propagate errors through to the CMB angular power spectra in the particular case of Planck-HFI, and to derive constraints on polarization parameters. We show that in order to limit the systematic error to 10% of the cosmic variance of the $E$-mode power spectrum, uncertainties in gain, polarization efficiency and detector orientation must be below 0.15%, 0.3% and 1\deg\ respectively. Pre-launch ground measurements reported in this paper already fulfill these requirements.
Ade Peter
Catalano Andrea
Conversi Luca
Couchot Francois
Crill Brendan P.
No associations
LandOfFree
Planck pre-launch status: High Frequency Instrument polarization calibration does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Planck pre-launch status: High Frequency Instrument polarization calibration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Planck pre-launch status: High Frequency Instrument polarization calibration will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-379852