Journal article
Redundant-baseline calibration of the hydrogen epoch of reionization array
JS Dillon, M Lee, ZS Ali, AR Parsons, N Orosz, CD Nunhokee, P La Plante, AP Beardsley, NS Kern, Z Abdurashidova, JE Aguirre, P Alexander, Y Balfour, G Bernardi, TS Billings, JD Bowman, RF Bradley, P Bull, J Burba, S Carey Show all
Monthly Notices of the Royal Astronomical Society | OXFORD UNIV PRESS | Published : 2020
Abstract
In 21-cm cosmology, precision calibration is key to the separation of the neutral hydrogen signal from very bright but spectrally smooth astrophysical foregrounds. 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..
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Grants
Awarded by Natural Sciences and Engineering Research Council of Canada
Funding Acknowledgements
[ "Work similar to that presented here appeared previously in unrefereed formats in both public HERA Memos #50 (Parsons & Dillon 2018), #61 (Dillon 2019a), #69 (Dillon 2019b), and #72 (Lee & Dillon 2019), as well as in Zaki Ali's University of California, Berkeley Ph.D. thesis (Ali 2018). This work was enabled by a number of software packages including SCIPY (Virtanen et al. 2020), NUMPY (Oliphant 2006), MATPLOTLIB (Hunter 2007), ASTROPY (Astropy Collaboration et al. 2013; Price-Whelan et al. 2018), and pyuvdata (Hazelton et al. 2017).", "This material is based upon work supported by the National Science Foundation under grants #1636646 and #1836019 and institutional support from theHERAcollaboration partners. This research is funded in part by the Gordon and Betty Moore Foundation. HERA is hosted by the South African Radio Astronomy Observatory, which is a facility of theNationalResearch Foundation, an agency of theDepartment of Science and Innovation. JSD gratefully acknowledges the support of the NSF AAPF award #1701536 and the Berkeley Center for Cosmological Physics. JSD also wishes to acknowledge a helpful discussion with Martin White that led to a number of clarifications to the Algorithm 1 and the surrounding prose. A. Liu acknowledges support from a Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant and a Discovery Launch Supplement, as well as the Canadian Institute forAdvanced Research (CIFAR) Azrieli Global Scholars program. Parts of this research were supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. GB acknowledges funding from the INAF PRIN-SKA 2017 project 1.05.01.88.04 (FORECaST), support from the Ministero degli Affari Esteri della Cooperazione Internazionale -Direzione Generale per la Promozione del Sistema Paese Progetto di Grande Rilevanza ZA18GR02 and the National Research Foundation of South Africa (Grant Number 113121) as part of the ISARP RADIOSKY2020 Joint Research Scheme, from the Royal Society and the Newton Fund under grant NA150184 and from the National Research Foundation of South Africa (Grant No. 103424). MGS acknowledges support from the South African Radio Astronomy Observatory (SARAO) and the National Research Foundation (Grant No. 84156)." ]