Improved Galactic Foreground Removal for B-Modes Detection with Clustering Methods

Abstract

Characterizing the sub-mm Galactic emission has become increasingly critical especially in identifying and removing its polarized contribution from the one emitted by the Cosmic Microwave Background (CMB). In this work, we present a parametric foreground removal performed onto sub-patches identified in the celestial sphere by means of spectral clustering. Our approach takes into account efficiently both the geometrical affinity and the similarity induced by the measurements and the accompanying errors. The optimal partition is then used to parametrically separate the Galactic emission encoding thermal dust and synchrotron from the CMB one applied on two nominal observations of forthcoming experiments from the ground and from the space. Performing the parametric fit singularly on each of the clustering derived regions results in an overall improvement: both controlling the bias and the uncertainties in the CMB $B-$mode recovered maps. We finally apply this technique using the map of the number of clouds along the line of sight, ${\mathcal{N}}_c$, as estimated from HI emission data and perform parametric fitting onto patches derived by clustering on this map. We show that adopting the ${\mathcal{N}}_c$ map as a tracer for the patches related to the thermal dust emission, results in reducing the $B-$mode residuals post-component separation. The code is made publicly available.

References in corpus (51)

• Planck 2015 results. XIII. Cosmological parameters
• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
• HI4PI: A full-sky HI survey based on EBHIS and GASS
• The Simons Observatory: Science goals and forecasts
• Planck 2018 results. IV. Diffuse component separation
• A unified pseudo-$C_{\ell }$ framework
• Joint Bayesian component separation and CMB power spectrum estimation
• Planck 2013 results. XII. Component separation
• Planck 2015 results. IX. Diffuse component separation: CMB maps
• The Atacama Cosmology Telescope: A Measurement of the Cosmic Microwave Background Power Spectra at 98 and 150 GHz
• Component separation methods for the Planck mission
• The Python Sky Model: software for simulating the Galactic microwave sky
• Planck Early Results XXIV: Dust in the diffuse interstellar medium and the Galactic halo
• Separation of anomalous and synchrotron emissions using WMAP polarization data
• Multi-Detector Multi-Component spectral matching and applications for CMB data analysis
• Planck constraints on the tensor-to-scalar ratio
• CMB component separation by parameter estimation
• A Measurement of the Cosmic Microwave Background $B$-Mode Polarization Power Spectrum at Sub-Degree Scales from 2 years of POLARBEAR Data
• Rethinking CMB foregrounds: systematic extension of foreground parameterizations
• Maximum Likelihood algorithm for parametric component separation in CMB experiments
• A needlet ILC analysis of WMAP 7-year data: estimation of CMB temperature map and power spectrum
• Constraints on Cosmological Parameters from the 500 deg${}^2$ SPTpol Lensing Power Spectrum
• CMBPol Mission Concept Study: Prospects for polarized foreground removal
• Updated design of the CMB polarization experiment satellite LiteBIRD
• SZ and CMB reconstruction using Generalized Morphological Component Analysis
• Exploring Cosmic Origins with CORE: B-mode Component Separation
• A Measurement of the Degree Scale CMB B-mode Angular Power Spectrum with POLARBEAR
• Foreground Subtraction of Cosmic Microwave Background Maps using WI-FIT (Wavelet based hIgh resolution Fitting of Internal Templates)
• Forecasting performance of CMB experiments in the presence of complex foreground contaminations
• Evidence for Line-of-Sight Frequency Decorrelation of Polarized Dust Emission in $Planck$ Data
• All-sky component separation in the presence of anisotropic noise and dust temperature variations
• A new probe of line-of-sight magnetic field tangling
• A minimal power-spectrum-based moment expansion for CMB B-mode searches
• Characterizing bias on large scale CMB $B$-modes after galactic foregrounds cleaning
• Simulated forecasts for primordial B-mode searches in ground-based experiments
• CMB signal in WMAP 3yr data with FastICA
• Dust moments: towards a new modelling of the galactic dust emission for CMB B-modes analysis
• Framework for performance forecasting and optimization of CMB B-mode observations in presence of astrophysical foregrounds
• Maps of the number of HI clouds along the line of sight at high galactic latitude
• A 3D model for CO molecular line emission as a potential CMB polarization contaminant
• Determining thermal dust emission from Planck HFI data using a sparse, parametric technique
• Exact heat kernel on a hypersphere and its applications in kernel SVM
• Hierarchical Bayesian CMB Component Separation with the No-U-Turn Sampler
• A Novel CMB Component Separation Method: Hierarchical Generalized Morphological Component Analysis
• Linearized iterative least-squares (LIL): A parameter fitting algorithm for component separation in multifrequency CMB experiments such as Planck
• Accelerating Cosmic Microwave Background map-making procedure through preconditioning
• Iterative map-making with two-level preconditioning for polarized Cosmic Microwave Background data sets
• Data driven foreground clustering approach to component separation in multifrequency CMB experiments: A new Planck CMB map
• Removal of Galactic foregrounds for the Simons Observatory primordial gravitational wave search
• Image Segmentation Based on Multiscale Fast Spectral Clustering

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• QUIJOTE scientific results -- VIII. Diffuse polarized foregrounds from component separation with QUIJOTE-MFI
• Characterising cosmic birefringence in the presence of galactic foregrounds and instrumental systematic effects
• A hybrid map-$C_{\ell }$ component separation method for primordial CMB $B$-mode searches
• How bad could it be? Modelling the 3D complexity of the polarised dust signal using moment expansion
• New probe of inflationary gravitational waves: cross-correlations of lensed primary CMB B-modes with large-scale structure
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