The Cosmic Microwave Background, instrumentation and data analysis

le 9 septembre 2022, 11h à 13h, Louise Mousset, salle Jules Verne, OMP

Resumé: The measurement of the B-mode polarization of the Cosmic Microwave Background (CMB) is one of the major challenges of observational cosmology. The signal is expected to be of the order of a few tens of nK, prone to instrumental systematic effects and polluted by various astrophysical foregrounds, making this measurement very challenging from the point of view of instrumentation and data analysis. In this seminar, I will first recall what is CMB and why B-modes are a main goal to test cosmic inflation. Then, I will present the main characteristics of a CMB telescope, detector type, cryogeny, polarimetry… Finally I will briefly present the main steps of data analysis that allow to make sky maps from temporal data.