Removing non-physical structure in fitted Faraday rotated signals: Non-parametric QU-fitting
Removing non-physical structure in fitted Faraday rotated signals: Non-parametric QU-fitting
Abstract Next-generation spectro-polarimetric broadband surveys will probe cosmic magnetic fields in unprecedented detail, using the magneto-optical effect known as Faraday rotation. However, non-parametric methods such as RMCLEAN can introduce non-observable linearly polarised flux into a fitted model at negative wavelengths squared. This leads to Faraday rotation structures that are consistent …