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    Calibration and 21-cm power spectrum estimation in the presence of antenna beam variations

    91391.pdf (1.105Mb)
    Access Status
    Open access
    Authors
    Joseph, R.C.
    Trott, Cathryn
    Wayth, Randall
    Nasirudin, A.
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Joseph, R.C. and Trott, C.M. and Wayth, R.B. and Nasirudin, A. 2020. Calibration and 21-cm power spectrum estimation in the presence of antenna beam variations. Monthly Notices of the Royal Astronomical Society. 492 (2): pp. 2017-2028.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stz3375
    ISSN
    0035-8711
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/CE170100013
    http://purl.org/au-research/grants/arc/FT180100321
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/91567
    Collection
    • Curtin Research Publications
    Abstract

    Detecting a signal from the Epoch of Reionization (EoR) requires an exquisite understanding of Galactic and extragalactic foregrounds, low-frequency radio instruments, instrumental calibration, and data analysis pipelines. In this work, we build upon existing work that aims to understand the impact of calibration errors on 21-cm power spectrum (PS) measurements. It is well established that calibration errors have the potential to inhibit EoR detections by introducing additional spectral features that mimic the structure of EoR signals. We present a straightforward way to estimate the impact of a wide variety of modelling residuals in EoR PS estimation. We apply this framework to the specific case of broken dipoles in Murchison Widefield Array (MWA) to understand its effect and estimate its impact on PS estimation. Combining an estimate of the percentage of MWA tiles that have at least one broken dipole (15-40 per cent) with an analytic description of beam errors induced by such dipoles, we compute the residuals of the foregrounds after calibration and source subtraction. We find that that incorrect beam modelling introduces bias in the 2D-PS on the order of ∼ 103 mK2 h−3 Mpc3. Although this is three orders of magnitude lower than current lowest limits, it is two orders of magnitude higher than the expected signal. Determining the accuracy of both current beam models and direction-dependent calibration pipelines is therefore crucial in our search for an EoR signal.

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