8-12 juin, 2014

Résumé

Quantifying polarized thermal emission from Galactic dust using Planck: a boon for Galactic science and cosmology

Peter Martin (CITA/Dunlap Institute, U. Toronto)

Planck Collaboration

Planck has mapped polarized thermal emission from Galactic dust in the submillimetre over the entire sky. Direct quantitative comparisons with optical interstellar polarization on the same lines of sight reveal the need for revised dust models even in the diffuse interstellar medium. From the orientation of the polarization, both the large-scale pattern of the Galactic magnetic field and its fluctuations induced by turbulence are revealed. Planck’s original scientific objectives regarding primordial B-modes in the CMB are ambitious. Polarized dust emission is an unwanted foreground but various properties directly measured by Planck, including the power spectrum in the submillimetre and the frequency dependence, can help to mitigate contamination of the cosmological B-mode signal.
(doit être confirmé par le SOC)