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    Modelling and mitigating refractive propagation effects in precision pulsar timing observations

    Access Status
    Fulltext not available
    Authors
    Shannon, Ryan
    Cordes, J.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Shannon, R. and Cordes, J. 2017. Modelling and mitigating refractive propagation effects in precision pulsar timing observations. Monthly Notices of the Royal Astronomical Society. 464 (2): pp. 2075-2089.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stw2449
    ISSN
    0035-8711
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/62483
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 The Authors. To obtain the most accurate pulse arrival times from radio pulsars, it is necessary to correct or mitigate the effects of the propagation of radio waves through the warm and ionized interstellar medium. We examine both the strength of propagation effects associated with large-scale electron-density variations and the methodology used to estimate infinite frequency arrival times. Using simulations of two-dimensional phase-varying screens, we assess the strength and non-stationarity of timing perturbations associated with large-scale density variations.We identify additional contributions to arrival times that are stochastic in both radio frequency and time and therefore not amenable to correction solely using times of arrival. We attribute this to the frequency dependence of the trajectories of the propagating radio waves. We find that this limits the efficacy of low-frequency (metre-wavelength) observations. Incorporating lowfrequency pulsar observations into precision timing campaigns is increasingly problematic for pulsars with larger dispersion measures.

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