Statistical properties of galactic CMB foregrounds: dust and synchrotron

Abstract

Recent Planck observations have revealed some of the important statistical properties of synchrotron and dust polarisation, namely, the $B$ to $E$ mode power and temperature-$E$ (TE) mode cross-correlation. In this paper, we extend our analysis in Kandel et al. (2017) that studied $B$ to $E$ mode power ratio for polarised dust emission to include TE cross-correlation and develop an analogous formalism for synchrotron signal, all using a realistic model of magnetohydrodynamical (MHD) turbulence. Our results suggest that the Planck results for both synchrotron and dust polarisation can be understood if the turbulence in the Galaxy is sufficiently sub-Alfvénic. We also show how $B$ to $E$ ratio as well as the TE cross-correlation can be used to study media magnetisation, compressibility, and level of density-magnetic field correlation.

11 pages, 4 figures, Submitted to MNRAS

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Cited by in corpus (20)

• Planck 2018 results. XI. Polarized dust foregrounds
• IMAGINE: A comprehensive view of the interstellar medium, Galactic magnetic fields and cosmic rays
• Role of Cosmic Ray Streaming and Turbulent Damping in Driving Galactic Winds
• Gradients of Synchrotron Polarization: Tracing 3D distribution of magnetic fields
• Ubiquitous Instabilities of Dust Moving in Magnetized Gas
• Dust Polarization Maps from TIGRESS: E/B power asymmetry and TE correlation
• Magnetic field strength from turbulence theory (I): Using differential measure approach (DMA)
• The bispectrum of polarized galactic foregrounds
• The Power Spectra of Polarized, Dusty Filaments
• Producing Synthetic Maps of Dust Polarization using Velocity Channel Gradient Technique
• Frequency dependence of the thermal dust $E/B$ ratio and $EB$ correlation: insights from the spin-moment expansion
• Is there a left-handed magnetic field in the solar neighborhood? Exploring helical magnetic fields in the interstellar medium through dust polarization power spectra
• Dust polarization modeling at large-scale over the Northern Galactic cap using EBHIS and Planck data
• hammurabi X: Simulating Galactic Synchrotron Emission with Random Magnetic Fields
• The link between E-B polarization modes and gas column density from interstellar dust emission
• Statistical properties of polarized CMB foreground maps
• Polarization power spectra and dust cloud morphology
• Statistical properties of Galactic synchrotron temperature and polarization maps -- a multi-frequency comparison
• Statistical signatures of interstellar turbulence in dust polarization maps
• Obtaining strength of magnetic field from E and B modes of dust polarization