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

Byrne, Ruby L. and Morales, Miguel F. and Hazelton, Bryna and Sullivan, Ian and Barry, Nichole (2022) The FHD polarised imaging pipeline: A new approach to widefield interferometric polarimetry. Publications of the Astronomical Society of Australia, 39 . Art. No. e023. ISSN 1323-3580. doi:10.1017/pasa.2022.21. https://resolver.caltech.edu/CaltechAUTHORS:20220428-212301062

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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).


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1017/pasa.2022.21DOIArticle
https://arxiv.org/abs/2201.10653arXivDiscussion Paper
ORCID:
AuthorORCID
Byrne, Ruby L.0000-0003-4980-2736
Hazelton, Bryna0000-0001-7532-645X
Sullivan, Ian0000-0003-0632-4607
Barry, Nichole0000-0003-2064-6979
Alternate Title:The FHD Polarized Imaging Pipeline: A New Approach to Widefield Interferometric Polarimetry
Additional Information:© The Author(s), 2022. Published by Cambridge University Press on behalf of the Astronomical Society of Australia. Received 25 January 2022; revised 30 March 2022; accepted 13 April 2022. Published online by Cambridge University Press: 13 May 2022. We would like to thank James Aguirre, Zachary Martinot, and Daniel Mitchell for conversations that contributed to this work. Thank you to Yuping Huang for assisting with revision of this paper. This work was directly supported by National Science Foundation (NSF) grant 1613855.
Funders:
Funding AgencyGrant Number
NSFAST-1613855
Subject Keywords:techniques: interferometric – techniques: polarimetric – methods: data analysis
DOI:10.1017/pasa.2022.21
Record Number:CaltechAUTHORS:20220428-212301062
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20220428-212301062
Official Citation:Byrne, R., Morales, M., Hazelton, B., Sullivan, I., & Barry, N. (2022). The fhd polarised imaging pipeline: A new approach to widefield interferometric polarimetry. Publications of the Astronomical Society of Australia, 39, E023. doi:10.1017/pasa.2022.21
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:114518
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:28 Apr 2022 22:34
Last Modified:20 Jul 2022 16:38

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