Application of beam deconvolution technique to power spectrum estimation for CMB measurements

Show simple item record Keihänen, E. Kiiveri, K. Kurki-Suonio, H. Reinecke, M. 2017-04-24T10:02:02Z 2017-04-24T10:02:02Z 2017-04
dc.identifier.citation Keihänen , E , Kiiveri , K , Kurki-Suonio , H & Reinecke , M 2017 , ' Application of beam deconvolution technique to power spectrum estimation for CMB measurements ' , Monthly Notices of the Royal Astronomical Society , vol. 466 , no. 2 , pp. 1348-1362 .
dc.identifier.other PURE: 83259063
dc.identifier.other PURE UUID: 20391c70-a2c9-4474-9e0c-013ff29cddba
dc.identifier.other WOS: 000398284600005
dc.identifier.other ORCID: /0000-0002-4618-3063/work/32279048
dc.identifier.other ORCID: /0000-0002-3711-3346/work/38545031
dc.identifier.other ORCID: /0000-0003-1804-7715/work/38542607
dc.description.abstract We present two novel methods for the estimation of the angular power spectrum of cosmic microwave background (CMB) anisotropies. We assume an absolute CMB experiment with arbitrary asymmetric beams and arbitrary sky coverage. The methods differ from the earlier ones in that the power spectrum is estimated directly from the time-ordered data, without first compressing the data into a sky map, and they take into account the effect of asymmetric beams. In particular, they correct the beam-induced leakage from temperature to polarization. The methods are applicable to a case where part of the sky has been masked out to remove foreground contamination, leaving a pure CMB signal, but incomplete sky coverage. The first method (deconvolution quadratic maximum likelihood) is derived as the optimal quadratic estimator, which simultaneously yields an unbiased spectrum estimate and minimizes its variance. We successfully apply it to multipoles up to l = 200. The second method is derived as a weak-signal approximation from the first one. It yields an unbiased estimate for the full multipole range, but relaxes the requirement of minimal variance. We validate the methods with simulations for the 70 GHz channel of Planck surveyor, and demonstrate that we are able to correct the beam effects in the TT, EE, BB and TE spectra up to multipole l = 1500. Together, the two methods cover the complete multipole range with no gap in between. en
dc.format.extent 15
dc.language.iso eng
dc.relation.ispartof Monthly Notices of the Royal Astronomical Society
dc.rights unspecified
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject methods: data analysis
dc.subject methods: numerical
dc.subject cosmic background radiation
dc.subject PLANCK
dc.subject STRATEGIES
dc.subject 115 Astronomy, Space science
dc.title Application of beam deconvolution technique to power spectrum estimation for CMB measurements en
dc.type Article
dc.contributor.organization Department of Physics
dc.contributor.organization Helsinki Institute of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.issn 0035-8711
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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