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dc.contributor.authorWilliams, Joel; email: christopher.williams-4@manchester.ac.uk
dc.contributor.authorMcCallum, Nialh; email: nialh.mccallum@manchester.ac.uk
dc.contributor.authorRotti, Aditya; email: aditya.rotti@manchester.ac.uk
dc.contributor.authorThomas, Daniel B.; email: daniel.thomas-2@manchester.ac.uk
dc.contributor.authorBattye, Richard; email: richard.battye@manchester.ac.uk
dc.contributor.authorBrown, Michael L.; email: m.l.brown@manchester.ac.uk
dc.date.accessioned2021-07-09T14:40:32Z
dc.date.available2021-07-09T14:40:32Z
dc.date.issued2021-07-09
dc.date.submitted2021-01-25
dc.identifierhttps://chesterrep.openrepository.com/bitstream/handle/10034/625201/metadata.xml?sequence=2
dc.identifierhttps://chesterrep.openrepository.com/bitstream/handle/10034/625201/pdf.pdf?sequence=3
dc.identifier.citationJournal of Cosmology and Astroparticle Physics, volume 2021, issue 07, page 016
dc.identifier.urihttp://hdl.handle.net/10034/625201
dc.descriptionFrom IOP Publishing via Jisc Publications Router
dc.descriptionHistory: received 2021-01-25, accepted 2021-06-09, ppub 2021-07, epub 2021-07-09, open-access 2021-07-09
dc.descriptionPublication status: Published
dc.description.abstractAbstract: We present the first detailed case study using quadratic estimators (QE) to diagnose and remove systematics present in observed Cosmic Microwave Background (CMB) maps. In this work we focus on the temperature to polarization leakage. We use an iterative QE analysis to remove systematics, in analogy to de-lensing, recovering the primordial B-mode signal and the systematic maps. We introduce a new Gaussian filtering scheme crucial to stable convergence of the iterative cleaning procedure and validate with comparisons to semi-analytical forecasts. We study the limitations of this method by examining its performance both on idealized simulations and on more realistic, non-ideal simulations, where we assume varying de-lensing efficiencies. Finally, we quantify the systematic cleaning efficiency by presenting a likelihood analysis on the tensor to scalar ratio, r, and demonstrate that the blind cleaning results in an un-biased measurement of r, reducing the systematic induced B-mode power by nearly two orders of magnitude.
dc.languageen
dc.publisherIOP Publishing
dc.rightsLicence for this article: http://creativecommons.org/licenses/by/4.0/
dc.sourceeissn: 1475-7516
dc.subjectpaper
dc.subjectCMBR detectors
dc.subjectCMBR experiments
dc.subjectCMBR polarisation
dc.subjectgravitational waves and CMBR polarization
dc.titleBlind map level systematics cleaning: a quadratic estimator approach
dc.typearticle
dc.date.updated2021-07-09T14:40:32Z
dc.date.accepted2021-06-09


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