Impact of modelling foreground uncertainties on future CMB polarization satellite experiments

Understand

We present an analysis of errors on the tensor-to-scalar ratio due to residual diffuse foregrounds.

• We use simulated observations of a CMB polarization satellite, the Cosmic Origins Explorer, using the specifications of the version proposed to ESA in 2010 (COrE).
• We construct a full pipeline from microwave sky maps to $r$ likelihood, using two models of diffuse Galactic foregrounds with different complexity, and assuming component separation with varying degrees of accuracy.
• Our pipeline uses a linear mixture (Generalized Least Squares) solution for component separation, and a hybrid approach for power spectrum estimation, with a Quadratic Maximum Likelihood estimator at low $\ell$s and a pseudo-$C_{\ell}$ deconvolution at high $\ell$s.