Removing non-physical structure in fitted Faraday rotated signals: Non-parametric QU-fitting

Author:

Pratley LukeORCID,Johnston-Hollitt Melanie,Gaensler Bryan M.ORCID

Abstract

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 with the observed data, but would be impossible or difficult to measure. We construct a convex non-parametric QU-fitting algorithm to constrain the flux at negative wavelengths squared to be zero. This allows the algorithm to recover structures that are limited in complexity to the observable region in wavelength squared. We verify this approach on simulated broadband data sets where we show that it has a lower root mean square error and that it can change the scientific conclusions for real observations. We advise using this prior in next-generation broadband surveys that aim to uncover complex Faraday depth structures. We provide a public Python implementation of the algorithm at https://github.com/Luke-Pratley/Faraday-Dreams.

Publisher

Cambridge University Press (CUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Full resolution deconvolution of complex Faraday spectra;Monthly Notices of the Royal Astronomical Society;2023-04-13

2. CS-ROMER: a novel compressed sensing framework for Faraday depth reconstruction;Monthly Notices of the Royal Astronomical Society;2022-11-22

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