Orateur
Description
One of the main scientific goals of the Simons Observatory (SO) Small Aperture Telescopes (SATs) is to measure traces of inflation in the primordial B-modes in the CMB polarization. This signal is expected to be extremely faint. Its detection therefore depends on the removal of contaminating signals emitted by Galactic foregrounds and an exquisite control of systematic effects, such as the impact that filtering spurious signals out of the data has on the reconstructed maps.
I will present the parametric map-based method that we are developing as one of the pipelines for foreground cleaning in the SATs. This approach allows us to handle complex foregrounds, inhomogeneous noise, and has been used in previous SO forecasts (Wolz et al. 2024). To manage the filtering, we are adapting it by using an observation matrix-based technique (Ade et al. 2016), which is directly incorporated into the foreground cleaning. For a survey as large as SO and observing from Chile, this matrix will be large and complex. This method has never been used under such conditions, necessitating the development of new algorithms to handle it.
