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Redundant-Baseline Calibration of the Hydrogen Epoch of Reionization Array | | Joshua S. Dillon
; Max Lee
; Zaki S. Ali
; Aaron R. Parsons
; Naomi Orosz
; Chuneeta Devi Nunhokee
; Paul La Plante
; Adam P. Beardsley
; Nicholas S. Kern
; Zara Abdurashidova
; James E. Aguirre
; Paul Alexander
; Yanga Balfour
; Gianni Bernardi
; Tashalee S. Billings
; Judd D. Bowman
; Richard F. Bradley
; Phil Bull
; Jacob Burba
; Steve Carey
; Chris L. Carilli
; Carina Cheng
; David R. DeBoer
; Matt Dexter
; Eloy de Lera Acedo
; John Ely
; Aaron Ewall-Wice
; Nicolas Fagnoni
; Randall Fritz
; Steven R. Furlanetto
; Kingsley Gale-Sides
; Brian Glendenning
; Deepthi Gorthi
; Bradley Greig
; Jasper Grobbelaar
; Ziyaad Halday
; Bryna J. Hazelton
; Jacqueline N. Hewitt
; Jack Hickish
; Daniel C. Jacobs
; Austin Julius
; Joshua Kerrigan
; Piyanat Kittiwisit
; Saul A. Kohn
; Matthew Kolopanis
; Adam Lanman
; Telalo Lekalake
; David Lewis
; Adrian Liu
; Yin-Zhe Ma
; David MacMahon
; Lourence Malan
; Cresshim Malgas
; Matthys Maree
; Zachary E. Martinot
; Eunice Matsetela
; Andrei Mesinger
; Mathakane Molewa
; Miguel F. Morales
; Tshegofalang Mosiane
; Steven Murray
; Abraham R. Neben
; Bojan Nikolic
; Robert Pascua
; Nipanjana Patra
; Samantha Pieterse
; Jonathan C. Pober
; Nima Razavi-Ghods
; Jon Ringuette
; James Robnett
; Kathryn Rosie
; Mario G. Santos
; Peter Sims
; Craig Smith
; Angelo Syce
; Max Tegmark
; Nithyanandan Thyagarajan
; Peter K. G. Williams
; Haoxuan Zheng
; | | Date: |
18 Mar 2020 | | Abstract: | In 21 cm cosmology, precision calibration is key to the separation of the
neutral hydrogen signal from bright astrophysical foregrounds. If not properly
calibrated, each antenna element’s complex gain can impart spectral structure
on otherwise spectrally-smooth foregrounds, complicating that statistical
separation. The Hydrogen Epoch of Reionization Array (HERA), an interferometer
specialized for 21 cm cosmology and now under construction in South Africa, was
designed to be largely calibrated using the self-consistency of repeated
measurements of the same interferometric modes. This technique, known as
redundant-baseline calibration resolves most of the internal degrees of freedom
in the calibration problem. It assumes, however, on antenna elements with
identical primary beams placed precisely on a redundant grid. In this work, we
review the detailed implementation of the algorithms enabling
redundant-baseline calibration and report results with HERA data. We quantify
the effects of real-world non-redundancy and how they compare to the idealized
scenario in which redundant measurements differ only in their noise
realizations. Finally, we study how non-redundancy can produce spurious
temporal structure in our calibration solutions---both in data and in
simulations---and present strategies for mitigating that structure. | | Source: | arXiv, 2003.8399 | | Services: | Forum | Review | PDF | Favorites | |
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