The FHD Polarized Imaging Pipeline: A New Approach to Widefield Interferometric Polarimetry

Abstract

We describe a new polarized imaging pipeline implemented in the FHD software package. The pipeline is based on the optimal mapmaking imaging approach and performs horizon-to-horizon image reconstruction in all polarization modes. We discuss the formalism behind the pipeline's polarized analysis, describing equivalent representations of the polarized beam response, or Jones matrix. We show that, for arrays where antennas have uniform polarization alignments, defining a non-orthogonal instrumental polarization basis enables accurate and efficient image reconstruction. Finally, we present a new calibration approach that leverages widefield effects to perform fully-polarized calibration. This analysis pipeline underlies the analysis of Murchison Widefield Array (MWA) data in Byrne et al. (2022, MNRAS, 510, 2011).

Published in PASA. The updated version includes an example of image reconstruction of a simulated polarized source

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Cited by in corpus (4)

• Delay-Weighted Calibration: Precision Calibration for 21 cm Cosmology with Resilience to Sky Model Error
• 21 cm Intensity Mapping with the DSA-2000
• A Formalism for Calibrating the Instrumental Polarization of Radio Interferometric Arrays at Meter Wavelengths using Unpolarized Sky: A Demonstration using the MWA Observations
• An Introduction to Single-Antenna Radio Astronomical Polarimetry