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Accepted manuscript

Verifying the Australian MWA EoR pipeline I: 21-cm sky model and correlated measurement density

Published online by Cambridge University Press:  19 April 2024

J. L. B. Line Open the ORCID record for J. L. B. Line [Opens in a new window] ,
C. M. Trott Open the ORCID record for C. M. Trott [Opens in a new window] ,
J. H. Cook ,
B. Greig ,
N. Barry  and
C. H. Jordan Open the ORCID record for C. H. Jordan [Opens in a new window]
J. L. B. Line*
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA 6102, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D)
C. M. Trott
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA 6102, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D)
J. H. Cook
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA 6102, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D)
B. Greig
Affiliation:
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D) School of Physics, University of Melbourne, Parkville, VIC 3010, Australia
N. Barry
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA 6102, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D)
C. H. Jordan
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Perth, WA 6102, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D)
*
Author for correspondence: J. L. B. Line, Email: jack.l.b.line@gmail.com.
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Abstract

We present the first of two papers dedicated to verifying the Australian Epoch of Reionisation pipeline (AusEoRPipe) through simulation. The AusEoRPipe aims to disentangle 21-cm radiation emitted by gas surrounding the very first stars from contaminating foreground astrophysical sources, and has been in development for close to a decade. In this paper, we build an accurate 21-cm sky model that can be used by the WODEN simulation software to create visibilities containing a predictable 21-cm signal. We verify that the power spectrum estimator CHIPS can recover this signal in the absence of foregrounds. We also investigate how measurements in Fourier-space are correlated, and how their gridded density affects the power spectrum. We measure and fit for this effect using Gaussian-noise simulations of the MWA phase I layout. We find a gridding density correction factor of 2.651 appropriate for integrations equal to or greater than 30 minutes of data, which contain observations with multiple primary beam pointings and LSTs. Paper II of this series will use the results of this paper to test the AusEoRPipe in the presence of foregrounds and instrumental effects.

Keywords

Astronomy data analysisReionisationGPU computing
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Accepted manuscript , pp. 1 - 13
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of the Astronomical Society of Australia

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