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

Understand

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.