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The fhd polarised imaging pipeline: A new approach to widefield interferometric polarimetry

Published online by Cambridge University Press:  13 May 2022

Ruby L. Byrne*
Affiliation:
Astronomy Department, California Institute of Technology, 1200 E California Blvd, Pasadena, CA 91125, USA
Miguel F. Morales
Affiliation:
Physics Department, University of Washington, 3910 15th Ave NE, Seattle, WA 98195, USA
Bryna Hazelton
Affiliation:
Physics Department, University of Washington, 3910 15th Ave NE, Seattle, WA 98195, USA eScience Institute, University of Washington, 3910 15th Ave NE, Seattle, WA 98195, USA
Ian Sullivan
Affiliation:
Astronomy Department, University of Washington, 3910 15th Ave NE, Seattle, WA 98195, USA
Nichole Barry
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA 6845, Australia Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Australia
*
Corresponding author: Ruby L. Byrne, email: rbyrne@caltech.edu.

Abstract

We describe a new polarised 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 polarisation modes. We discuss the formalism behind the pipeline’s polarised analysis, describing equivalent representations of the polarised beam response, or Jones matrix. We show that, for arrays where antennas have uniform polarisation alignments, defining a non-orthogonal instrumental polarisation basis enables accurate and efficient image reconstruction. Finally, we present a new calibration approach that leverages widefield effects to perform fully polarised calibration. This analysis pipeline underlies the analysis of Murchison Widefield Array data in Byrne et al. (2022, MNRAS, 510, 2011).

Type
Research Article
Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of the Astronomical Society of Australia

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