Joint 3D modelling of the polarized Galactic synchrotron and thermal dust foreground diffuse emission

Abstract

We present for the first time a coherent model of the polarized Galactic synchrotron and thermal dust emissions which are the main diffuse foreground for the measurement of the polarized power spectra of the CMB fluctuations with the Planck satellite mission. We produce 3D models of the Galactic magnetic field including regular and turbulent components, and of the distribution of matter in the Galaxy, relativistic electrons and dust grains. By integrating along the line of sight we construct maps of the polarized Galactic synchrotron and thermal dust emission for each of these models and compare them to currently available data. We consider the 408 MHz all-sky continuum survey, the 23 GHz band of the Wilkinson Microwave Anisotropy Probe and the 353 GHz Archeops data.}{The best-fit parameters obtained are consistent with previous estimates in the literature based only on synchrotron emission and pulsar rotation measurements. They allows us to reproduce the large scale structures observed on the data. Poorly understood local Galactic structures and turbulence make difficult an accurate reconstruction of the observations in the Galactic plane. Finally, using the best-fit model we are able to estimate the expected polarized foreground contamination at the Planck frequency bands. For the CMB bands, 70, 100, 143 and 217 GHz, at high Galactic latitudes although the CMB signal dominates in general, a significant foreground contribution is expected at large angular scales. In particular, this contribution will dominate the CMB signal for the B modes expected from realistic models of a background of primordial gravitational waves.

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• Galactic synchrotron emission with cosmic ray propagation models
• Magnetic Fields in the Milky Way
• New constraints on modelling the random magnetic field of the MW
• Bi-layer Kinetic Inductance Detectors for space observations between 80-120 GHz
• Comparing Polarised Synchrotron and Thermal Dust Emission in the Galactic Plane
• A 3-D model of polarised dust emission in the Milky Way
• Practical Modeling of Large-Scale Galactic Magnetic Fields: Status and Prospects
• Loops and spurs: The angular power spectrum of the Galactic synchrotron background
• Toward a hybrid dynamo model for the Milky Way
• Planck intermediate results. XLII. Large-scale Galactic magnetic fields
• Simulating the Galactic Multi-messenger Emissions with HERMES
• Local Bubble contribution to the 353-GHz dust polarized emission
• $B$-mode forecast of CMB-Bh$\overline{a}$rat
• A Model For Polarised Microwave Foreground Emission From Interstellar Dust
• Three-Dimensional Structure of the Magnetic Field in the Disk of the Milky Way
• Planck intermediate results. XLIV. The structure of the Galactic magnetic field from dust polarization maps of the southern Galactic cap
• Full-sky, arcminute-scale, 3D models of Galactic microwave foreground dust emission based on filaments
• The Galaxy in circular polarization: all-sky radio prediction, detection strategy, and the charge of the leptonic cosmic rays
• Expected constraints on the Galactic magnetic field using PLANCK data
• Three-dimensional magnetic fields of molecular clouds
• Fingerprint of Galactic Loop I on polarized microwave foregrounds
• A more detailed look at Galactic magnetic field models: using free-free absorption in HII regions
• Model of the polarized foreground diffuse Galactic emissions from 33 to 353 GHz
• A new approach of estimating the Galactic thermal dust and synchrotron polarized emission template in the microwave bands
• Simulating a full-sky high resolution Galactic synchrotron spectral index map using neural networks