The HERA-19 Commissioning Array: Direction-dependent Effects

SA Kohn; JE Aguirre; P La Plante; TS Billings; PM Chichura; AF Fortino; AS Igarashi; RK Benefo; S Gallardo; ZE Martinot; CD Nunhokee; NS Kern; P Bull; A Liu; P Alexander; ZS Ali; AP Beardsley; G Bernardi; JD Bowman; RF Bradley; CL Carilli; C Cheng; DR Deboer; EDL Acedo; JS Dillon; A Ewall-Wice; G Fadana; N Fagnoni; R Fritz; SR Furlanetto; B Glendenning; B Greig; J Grobbelaar; BJ Hazelton; JN Hewitt; J Hickish; DC Jacobs; A Julius; M Kariseb; M Kolopanis; T Lekalake; A Loots; D Macmahon; L Malan; C Malgas; M Maree; N Mathison; E Matsetela; A Mesinger; MF Morales; AR Neben; B Nikolic; AR Parsons; N Patra; S Pieterse; JC Pober; N Razavi-Ghods; J Ringuette; J Robnett; K Rosie; R Sell; C Smith; A Syce; M Tegmark; N Thyagarajan; PKG Williams; H Zheng

Journal article

The HERA-19 Commissioning Array: Direction-dependent Effects

SA Kohn, JE Aguirre, P La Plante, TS Billings, PM Chichura, AF Fortino, AS Igarashi, RK Benefo, S Gallardo, ZE Martinot, CD Nunhokee, NS Kern, P Bull, A Liu, P Alexander, ZS Ali, AP Beardsley, G Bernardi, JD Bowman, RF Bradley Show all

The Astrophysical Journal: an international review of astronomy and astronomical physics | American Astronomical Society | Published : 2019

DOI: 10.3847/1538-4357/ab2f72

Abstract

Foreground power dominates the measurements of interferometers that seek a statistical detection of highly-redshifted H i emission from the Epoch of Reionization (EoR). The chromaticity of the instrument creates a boundary in the Fourier transform of frequency (proportional to k ∥) between spectrally smooth emission, characteristic of the strong synchrotron foreground (the "wedge"), and the spectrally structured emission from H i in the EoR (the "EoR window"). Faraday rotation can inject spectral structure into otherwise smooth polarized foreground emission, which through instrument effects or miscalibration could possibly pollute the EoR window. For instruments pursuing a "foreground avoida..

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University of Melbourne Researchers

Bradley Greig Author

Related Projects (1)

ARC CENTRE OF EXCELLENCE FOR ALL SKY ASTROPHYSICS IN 3D (ASTRO 3D)

Grants

Awarded by Australian Research Council

Funding Acknowledgements

This material is based upon work supported by the National Science Foundation under grants No. 1440343 and 1636646, the Gordon and Betty Moore Foundation, and institutional support from the HERA collaboration partners.HERA is hosted by the South African Radio Astronomy Observatory, which is a facility of the National Research Foundation, an agency of the Department of Science and Technology.Much of this study was undertaken during the inaugural CAMPARE-HERA Astronomy Minority Partnership (CHAMP), funded under the NSF grants.S.A.K. is supported by a University of Pennsylvania SAS Dissertation Completion Fellowship. J.E.A. acknowledges support from NSF CAREER award #1455151. C.D.N. is supported by the SKA SA scholarship program. A.L. 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 for Advanced Research (CIFAR) Azrieli Global Scholar, Gravity and the Extreme universe Program. G.B. acknowledges support from the Royal Society and the Newton Fund under grant NA150184. This work is based on the research supported in part by the National Research Foundation of South Africa (grant No. 103424). J.S.D. acknowledges the support of the NSF AAPF award #1701536 and the Berkeley Center for Cosmological Physics. M.J.K. is supported by the NSF under project number AST-1613973 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. Computing hardware was provided by funds from the Mt. Cuba Astronomical Foundation.