BICEP / Keck XVI: Characterizing Dust Polarization through Correlations with Neutral Hydrogen

Abstract

We characterize Galactic dust filaments by correlating BICEP/Keck and Planck data with polarization templates based on neutral hydrogen (H I) observations. Dust polarization is important for both our understanding of astrophysical processes in the interstellar medium (ISM) and the search for primordial gravitational waves in the cosmic microwave background (CMB). In the diffuse ISM, H I is strongly correlated with the dust and partly organized into filaments that are aligned with the local magnetic field. We analyze the deep BICEP/Keck data at 95, 150, and 220 GHz, over the low-column-density region of sky where BICEP/Keck has set the best limits on primordial gravitational waves. We separate the H I emission into distinct velocity components and detect dust polarization correlated with the local Galactic H I but not with the H I associated with Magellanic Stream I. We present a robust, multifrequency detection of polarized dust emission correlated with the filamentary H I morphology template down to 95 GHz. For assessing its utility for foreground cleaning, we report that the H I morphology template correlates in B modes at a $\sim$10-65$\%$ level over the multipole range $20<\ell <200$ with the BICEP/Keck maps, which contain contributions from dust, CMB, and noise components. We measure the spectral index of the filamentary dust component spectral energy distribution to be $\beta =1.54\pm 0.13$. We find no evidence for decorrelation in this region between the filaments and the rest of the dust field or from the inclusion of dust associated with the intermediate velocity H I. Finally, we explore the morphological parameter space in the H I-based filamentary model.

arXiv comment27 pages, 12 figures

References in corpus (51)

• Astropy: A Community Python Package for Astronomy
• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• HI4PI: A full-sky HI survey based on EBHIS and GASS
• A Joint Analysis of BICEP2/Keck Array and Planck Data
• Signature of Gravity Waves in Polarization of the Microwave Background
• BICEP / Keck XIII: Improved Constraints on Primordial Gravitational Waves using Planck, WMAP, and BICEP/Keck Observations through the 2018 Observing Season
• A Probe of Primordial Gravity Waves and Vorticity
• Planck 2013 results. XI. All-sky model of thermal dust emission
• Cobaya: Code for Bayesian Analysis of hierarchical physical models
• Extrapolation of Galactic Dust Emission at 100 Microns to CMBR Frequencies Using FIRAS
• Gaseous Galaxy Halos
• Planck intermediate results. XIX. An overview of the polarized thermal emission from Galactic dust
• GASS: The Parkes Galactic All-Sky Survey. I. Survey Description, Goals, and Initial Data Release
• Distances and Metallicities of High- and Intermediate-Velocity Clouds
• Planck intermediate results. LVII. Joint Planck LFI and HFI data processing
• Toward an Understanding of Foreground Emission in the BICEP2 Region
• CMB-S4: Forecasting Constraints on Primordial Gravitational Waves
• Measuring Polarization In Cosmic Microwave Background
• Magnetically Aligned HI Fibers and the Rolling Hough Transform
• Planck Early Results XXIV: Dust in the diffuse interstellar medium and the Galactic halo
• A FUSE Survey of Interstellar Molecular Hydrogen in the Small and Large Magellanic Clouds
• The Effelsberg-Bonn HI Survey: Milky Way gas. First data release
• The Magellanic Stream: Circumnavigating the Galaxy
• A new, large-scale map of interstellar reddening derived from HI emission
• Robust forecasts on fundamental physics from the foreground-obscured, gravitationally-lensed CMB polarization
• Three-dimensional extinction maps: Inverting inter-calibrated extinction catalogues
• Neutral hydrogen structures trace dust polarization angle: Implications for cosmic microwave background foregrounds
• Rethinking CMB foregrounds: systematic extension of foreground parameterizations
• Mapping the Magnetic Interstellar Medium in Three Dimensions Over the Full Sky with Neutral Hydrogen
• Infrared Excess and Molecular Clouds: A comparison of new suerveys of far-infrared and H I 21-cm emission at high galactic latitudes
• CCAT-prime Collaboration: Science Goals and Forecasts with Prime-Cam on the Fred Young Submillimeter Telescope
• GASKAP -- The Galactic ASKAP Survey
• A new all-sky map of Galactic high-velocity clouds from the 21-cm HI4PI survey
• CMBPol Mission Concept Study: Prospects for polarized foreground removal
• The Origin of Parity Violation in Polarized Dust Emission and Implications for Cosmic Birefringence
• The Physical Nature of Neutral Hydrogen Intensity Structure
• The Magellanic Stream at 20 kpc: A New Orbital History for the Magellanic Clouds
• Extragalactic Imprints in Galactic Dust Maps
• Evidence for Line-of-Sight Frequency Decorrelation of Polarized Dust Emission in $Planck$ Data
• Three-Dimensional Distribution of the Interstellar Dust in the Milky Way
• Mitigating Complex Dust Foregrounds in Future CMB Polarization Experiments
• A new probe of line-of-sight magnetic field tangling
• The Power Spectra of Polarized, Dusty Filaments
• HI filaments are cold and associated with dark molecular gas. HI4PI based estimates of the local diffuse CO-dark H2 distribution
• Detection of a Coherent Magnetic Field in the Magellanic Bridge through Faraday Rotation
• Chemical Abundances in the Leading Arm of the Magellanic Stream
• The Simons Observatory: Galactic Science Goals and Forecasts
• Maps of the number of HI clouds along the line of sight at high galactic latitude
• BICEP2 / Keck Array VII: Matrix based E/B Separation applied to BICEP2 and the Keck Array
• Dust polarization spectral dependence from Planck HFI data. Turning point on CMB polarization foregrounds modelling

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• Modeling parity-violating spectra in Galactic dust polarization with filaments and its applications to cosmic birefringence searches
• Impact of Galactic dust non-Gaussianity on searches for B-modes from inflation
• Analysis of Polarized Dust Emission Using Data from the First Flight of SPIDER
• New probe of inflationary gravitational waves: cross-correlations of lensed primary CMB B-modes with large-scale structure
• The Simons Observatory: Assessing the Impact of Dust Complexity on the Recovery of Primordial $B$-modes