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    The effect of interplanetary scintillation on epoch of reionization power spectra

    235439_235439.pdf (1.306Mb)
    Access Status
    Open access
    Authors
    Trott, Cathryn
    Tingay, Steven
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Trott, C. and Tingay, S. 2015. The effect of interplanetary scintillation on epoch of reionization power spectra. Astrophysical Journal. 814: 27.
    Source Title
    Astrophysical Journal
    DOI
    10.1088/0004-637X/814/1/27
    ISSN
    0004-637X
    School
    Curtin Institute of Radio Astronomy (Physics)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DE140100316
    Remarks

    Copyright © 2015 The American Astronomical Society. Reproduced by permission of the AAS

    URI
    http://hdl.handle.net/20.500.11937/10429
    Collection
    • Curtin Research Publications
    Abstract

    © 2015. The American Astronomical Society. All rights reserved. Interplanetary Scintillation (IPS) induces intensity fluctuations in small angular size astronomical radio sources via the distortive effects of spatially and temporally varying electron density associated with outflows from the Sun. These radio sources are a potential foreground contaminant signal for redshifted HI emission from the Epoch of Reionization (EoR) because they yield time-dependent flux density variations in bright extragalactic point sources. Contamination from foreground continuum sources complicates efforts to discriminate the cosmological signal from other sources in the sky. In IPS, at large angles from the Sun applicable to EoR observations, weak scattering induces spatially and temporally correlated fluctuations in the measured flux density of sources in the field, potentially affecting the detectability of the EoR signal by inducing non-static variations in the signal strength. In this work, we explore the impact of interplanetary weak scintillation on EoR power spectrum measurements, accounting for the instrumental spatial and temporal sampling. We use published power spectra of electron density fluctuations and parameters of EoR experiments to derive the IPS power spectrum in the wavenumber phase space of EoR power spectrum measurements. The contrast of IPS power to expected cosmological power is used as a metric to assess the impact of IPS. We show that IPS has a spectral structure different from power from foregrounds alone, but the additional leakage into the EoR observation parameter space is negligible under typical IPS conditions, unless data are used from deep within the foreground contamination region.

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