Dust polarization spectral dependence from Planck HFI data. Turning point on CMB polarization foregrounds modelling

Abstract

The search for the primordial B-modes of the cosmic microwave background (CMB) relies on the separation from the brighter foreground dust signal. In this context, the characterisation of the spectral energy distribution (SED) of thermal dust in polarization has become a critical subject of study. We present a power-spectra analysis of Planck data, which improves on previous studies by using the newly released SRoll2 maps that correct residual data systematics, and by extending the analysis to regions near the Galactic plane. Our analysis focuses on the lowest multipoles between l=4 and 32, and three sky areas with sky fractions of fsky = 80%, 90%, and 97%. The mean dust SED for polarization and the 353 GHz Q and U maps are used to compute residual maps at 100, 143 and 217 GHz, highlighting spatial variations of the dust polarization SED. Residuals are detected at the three frequencies for the three sky areas. We show that models based on total intensity data are underestimating by a significant factor the complexity of dust polarized CMB foreground. Our analysis emphasizes the need to include variations of polarization angles of the dust polarized CMB foreground. The frequency dependence of the EE and BB power spectra of the residual maps yields further insight. We find that the moments expansion to the first order of the modified black-body (MBB) spectrum provides a good fit to the EE power-spectra. This result suggests that the residuals could follow mainly from variations of dust MBB spectral parameters. However, this conclusion is challenged by cross-spectra showing that the residuals maps at the three frequencies are not fully correlated, and the fact that the BB power-spectra do not match the first order moment expansion of a MBB SED. This work sets new requirements for simulations of the dust polarized foreground and component separation methods (abridged)

arXiv comment13 pages, 13 figures, Accepted for publication in the Cosmology section of A&A journal

References in corpus (39)

• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Final Maps and Results
• The Simons Observatory: Science goals and forecasts
• Planck 2018 results. V. CMB power spectra and likelihoods
• Planck 2013 results. XI. All-sky model of thermal dust emission
• Planck 2018 results. IV. Diffuse component separation
• Planck intermediate results. XLVI. Reduction of large-scale systematic effects in HFI polarization maps and estimation of the reionization optical depth
• Planck 2018 results. III. High Frequency Instrument data processing and frequency maps
• The Quest for B Modes from Inflationary Gravitational Waves
• Planck 2015 results. VIII. High Frequency Instrument data processing: Calibration and maps
• The Python Sky Model: software for simulating the Galactic microwave sky
• Fast estimation of polarization power spectra using correlation functions
• Planck intermediate results. XXX. The angular power spectrum of polarized dust emission at intermediate and high Galactic latitudes
• Planck 2018 results. XI. Polarized dust foregrounds
• Planck early results: first assessment of the High Frequency Instrument in-flight performance
• Planck intermediate results. XXII. Frequency dependence of thermal emission from Galactic dust in intensity and polarization
• Planck 2013 results. IX. HFI spectral response
• Planck intermediate results. XVII. Emission of dust in the diffuse interstellar medium from the far-infrared to microwave frequencies
• Planck early results. III. First assessment of the Low Frequency Instrument in-flight performance
• Rethinking CMB foregrounds: systematic extension of foreground parameterizations
• Planck pre-launch status: High Frequency Instrument polarization calibration
• Dust models compatible with Planck intensity and polarization data in translucent lines of sight
• The S-PASS view of polarized Galactic Synchrotron at 2.3 GHz as a contaminant to CMB observations
• SRoll2: an improved mapmaking approach to reduce large-scale systematic effects in the Planck High Frequency Instrument legacy maps
• Planck intermediate results. L. Evidence for spatial variation of the polarized thermal dust spectral energy distribution and implications for CMB $B$-mode analysis
• Evidence for Line-of-Sight Frequency Decorrelation of Polarized Dust Emission in $Planck$ Data
• Mitigating Complex Dust Foregrounds in Future CMB Polarization Experiments
• A minimal power-spectrum-based moment expansion for CMB B-mode searches
• TEASING: a fast and accurate approximation for the low multipole likelihood of the Cosmic Microwave Background temperature
• First Observation of the Submillimeter Polarization Spectrum in a Translucent Molecular Cloud
• Foreground-Induced Biases in CMB Polarimeter Self-Calibration
• Dust moments: towards a new modelling of the galactic dust emission for CMB B-modes analysis
• High precision modeling of polarized signals: Moment expansion method generalized to spin-2 fields
• Characterization of the polarized synchrotron emission from Planck and WMAP data
• A 3D model for CO molecular line emission as a potential CMB polarization contaminant
• Polarized Synchrotron Foreground Assessment for CMB Experiments
• The Interstellar Dust Emission Spectrum, Going beyond the single temperature greybody
• Limits on Polarized Dust Spectral Index Variations for CMB Foreground Analysis
• The Python Sky Model 3 software

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• BICEP / Keck XVI: Characterizing Dust Polarization through Correlations with Neutral Hydrogen
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• Absolute reference for microwave polarization experiments -- The COSMOCal project and its proof of concept
• Impact of Galactic dust non-Gaussianity on searches for B-modes from inflation
• How bad could it be? Modelling the 3D complexity of the polarised dust signal using moment expansion
• Identifying frequency decorrelated dust residuals in B-mode maps by exploiting the spectral capability of bolometric interferometry
• The Simons Observatory: Assessing the Impact of Dust Complexity on the Recovery of Primordial $B$-modes
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