Journal article
The necessity of individually validated beam models for an interferometric epoch of reionization detection
A Chokshi, N Barry, JLB Line, CH Jordan, B Pindor, RL Webster
Monthly Notices of the Royal Astronomical Society | Oxford University Press | Published : 2024
Abstract
A first statistical detection of the 21-cm Epoch of Reionization (EoR) is on the horizon, as cosmological volumes of the Universe become accessible via the adoption of low-frequency interferometers. We explore the impact which non-identical instrumental beam responses can have on the calibrated power spectrum and a future EoR detection. All-sky satellite measurements of Murchison Widefield Array (MWA) beams have revealed significant sidelobe deviations from cutting-edge electromagnetic simulations at the zenith power level. By generating physically motivated deformed beam models, we emulate real measurements of the MWA which inherently encode the imprints of varied beams. We explore two cali..
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Grants
Awarded by Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)
Awarded by Australian Research Council Discovery Early Career Researcher Award (DECRA)
Funding Acknowledgements
We are grateful to Miguel F. Morales for insightful discussions.This research was supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. Part of this work was supported by the Melbourne Research Scholarship from the University of Melbourne. Part of this work was supported by the Australian Research Council Discovery Early Career Researcher Award (DECRA) through project number DE240101377. This work was supported by resources awarded under Astronomy Australia Ltd's merit allocation scheme on the OzSTAR national facility at Swinburne University of Technology. OzSTAR is funded by Swinburne University of Technology and the National Collaborative Research Infrastructure Strategy (NCRIS). This work was supported by resources provided by the Pawsey Supercomputing Centre with funding from the Australian Government and the Government of Western Australia. This scientific work makes use of the Inyarrimanha Ilgari Bundara Murchison Radio-Astronomy Observatory, operated by CSIRO. We acknowledge the Wajarri Yamatji people as the traditional owners of the observatory site. The International Centre for Radio Astronomy Research (ICRAR) is a joint venture of Curtin University and The University of Western Australia, funded by the Western Australian State government.