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The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis

Published online by Cambridge University Press:  04 November 2020

Zheng Zhang*
Affiliation:
Department of Physics, Brown University, Providence, RI02912, USA
Jonathan C. Pober
Affiliation:
Department of Physics, Brown University, Providence, RI02912, USA
Wenyang Li
Affiliation:
Department of Physics, Brown University, Providence, RI02912, USA
Bryna J. Hazelton
Affiliation:
Department of Physics, University of Washington, Seattle, WA98195, USA eScience Institute, University of Washington, Seattle, WA98195, USA
Miguel F. Morales
Affiliation:
Department of Physics, University of Washington, Seattle, WA98195, USA
Cathryn M. Trott
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA6845, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D)
Christopher H. Jordan
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA6845, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D)
Ronniy C. Joseph
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA6845, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D)
Adam Beardsley
Affiliation:
School of Earth and Space Exploration, Arizona State University, Tempe, AZ85287, USA
Nichole Barry
Affiliation:
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D) School of Physics, The University of Melbourne, Parkville, VIC3010, Australia
Ruby Byrne
Affiliation:
Department of Physics, University of Washington, Seattle, WA98195, USA
Steven J. Tingay
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA6845, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D)
Aman Chokshi
Affiliation:
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D) School of Physics, The University of Melbourne, Parkville, VIC3010, Australia
Kenji Hasegawa
Affiliation:
Graduate School of Science, Nagoya University, Nagoya, Japan
Daniel C. Jacobs
Affiliation:
School of Earth and Space Exploration, Arizona State University, Tempe, AZ85287, USA
Adam Lanman
Affiliation:
Department of Physics, Brown University, Providence, RI02912, USA
Jack L. B. Line
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA6845, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D)
Christene Lynch
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA6845, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D)
Benjamin McKinley
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA6845, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D)
Daniel A. Mitchell
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA6845, Australia CSIRO Astronomy and Space Science (CASS), PO Box 76, Epping, NSW1710, Australia
Steven Murray
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA6845, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D)
Bart Pindor
Affiliation:
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D) School of Physics, The University of Melbourne, Parkville, VIC3010, Australia
Mahsa Rahimi
Affiliation:
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D) School of Physics, The University of Melbourne, Parkville, VIC3010, Australia
Keitaro Takahashi
Affiliation:
Faculty of Science, Kumamoto University, 2-39-1 Kurokami, Kumamoto860-8555, Japan International Research Organization for Advanced Science and Technology, Kumamoto University, Kumamoto860-8555, Japan
Randall B. Wayth
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA6845, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D)
Rachel L. Webster
Affiliation:
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D) School of Physics, The University of Melbourne, Parkville, VIC3010, Australia
Michael Wilensky
Affiliation:
Department of Physics, University of Washington, Seattle, WA98195, USA
Shintaro Yoshiura
Affiliation:
School of Physics, The University of Melbourne, Parkville, VIC3010, Australia
Qian Zheng
Affiliation:
Shanghai Astronomical Observatory, Shanghai, China
*
Author for correspondence: Zheng Zhang, E-mail: zheng_zhang1@alumni.brown.edu

Abstract

Precise instrumental calibration is of crucial importance to 21-cm cosmology experiments. The Murchison Widefield Array’s (MWA) Phase II compact configuration offers us opportunities for both redundant calibration and sky-based calibration algorithms; using the two in tandem is a potential approach to mitigate calibration errors caused by inaccurate sky models. The MWA Epoch of Reionization (EoR) experiment targets three patches of the sky (dubbed EoR0, EoR1, and EoR2) with deep observations. Previous work in Li et al. (2018) and (2019) studied the effect of tandem calibration on the EoR0 field and found that it yielded no significant improvement in the power spectrum (PS) over sky-based calibration alone. In this work, we apply similar techniques to the EoR1 field and find a distinct result: the improvements in the PS from tandem calibration are significant. To understand this result, we analyse both the calibration solutions themselves and the effects on the PS over three nights of EoR1 observations. We conclude that the presence of the bright radio galaxy Fornax A in EoR1 degrades the performance of sky-based calibration, which in turn enables redundant calibration to have a larger impact. These results suggest that redundant calibration can indeed mitigate some level of model incompleteness error.

Type
Research Article
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of the Astronomical Society of Australia

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The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis
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