Journal article

Measuring HERA's Primary Beam in Situ: Methodology and First Results

CD Nunhokee, AR Parsons, NS Kern, B Nikolic, JC Pober, G Bernardi, CL Carilli, Z Abdurashidova, JE Aguirre, P Alexander, ZS Ali, Y Balfour, AP Beardsley, TS Billings, JD Bowman, RF Bradley, J Burba, C Cheng, DR Deboer, M Dexter Show all

The Astrophysical Journal: an international review of astronomy and astronomical physics | American Astronomical Society | Published : 2020

Abstract

The central challenge in 21 cm cosmology is isolating the cosmological signal from bright foregrounds. Many separation techniques rely on the accurate knowledge of the sky and the instrumental response, including the antenna primary beam. For drift-scan telescopes, such as the Hydrogen Epoch of Reionization Array (HERA), that do not move, primary beam characterization is particularly challenging because standard beam-calibration routines do not apply (Cornwell et al.) and current techniques require accurate source catalogs at the telescope resolution. We present an extension of the method from Pober et al. where they use beam symmetries to create a network of overlapping source tracks that b..

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University of Melbourne Researchers

Grants

Awarded by National Science Foundation


Awarded by Australian Research Council Centre of Excellence


Awarded by INAF PRIN-SKA 2017 project


Awarded by Ministero degli Affari Esteri della Cooperazione Internazionale-Direzione Generale per la Promozione del Sistema Paese Progetto di Grande Rilevanza


Awarded by National Research Foundation of South Africa


Awarded by Newton Fund


Funding Acknowledgements

This material is based upon work supported by the National Science Foundation under grant Nos. 1636646 and 1836019, and institutional support from the HERA collaboration partners. This research is funded in part by the Gordon and Betty Moore Foundation. 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. 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 Innovation. G.B. acknowledges funding from the INAF PRIN-SKA 2017 project 1.05.01.88.04 (FORE-CaST), 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 No. 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).