Exploring cosmic origins with CORE : Mitigation of systematic effects

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http://hdl.handle.net/10138/308567

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CORE Collaboration , Natoli , P , Kiiveri , K , Lindholm , V , Keihänen , E , Kurki-Suonio , H & Väliviita , J 2018 , ' Exploring cosmic origins with CORE : Mitigation of systematic effects ' , Journal of Cosmology and Astroparticle Physics , no. 4 , 022 . https://doi.org/10.1088/1475-7516/2018/04/022

Title: Exploring cosmic origins with CORE : Mitigation of systematic effects
Author: CORE Collaboration; Natoli, P.; Kiiveri, K.; Lindholm, V.; Keihänen, E.; Kurki-Suonio, H.; Väliviita, J.
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2018-04
Language: eng
Number of pages: 51
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
URI: http://hdl.handle.net/10138/308567
Abstract: We present an analysis of the main systematic effects that could impact the measurement of CMB polarization with the proposed CORE space mission. We employ timeline to-map simulations to verify that the CORE instrumental set-up and scanning strategy allow us to measure sky polarization to a level of accuracy adequate to the mission science goals. We also show how the CORE observations can be processed to mitigate the level of contamination by potentially worrying systematics, including intensity-to-polarization leakage due to bandpass mismatch, asymmetric main beams, pointing errors and correlated noise. We use analysis techniques that are well validated on data from current missions such as Planck to demonstrate how the residual contamination of the measurements by these effects can be brought to a level low enough not to hamper the scientific capability of the mission, nor significantly increase the overall error budget. We also present a prototype of the CORE photometric calibration pipeline, based on that used for Planck, and discuss its robustness to systematics, showing how CORE can achieve its calibration requirements. While a fine-grained assessment of the impact of systematics requires a level of knowledge of the system that can only be achieved in a future study phase, the analysis presented here strongly suggests that the main areas of concern for the CORE mission can be addressed using existing knowledge, techniques and algorithms.
Subject: CMBR experiments
CMBR polarisation
gravitational waves and CMBR polarization
MAP-MAKING ALGORITHM
POLARIZATION MAPS
PLANCK SURVEYOR
CMB EXPERIMENTS
INSTRUMENT
NOISE
LIKELIHOOD
SPECTRA
FLIGHT
115 Astronomy, Space science
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