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    Dispersion measure variations and their effect on precision pulsar timing

    Access Status
    Open access via publisher
    Authors
    You, X.
    Hobbs, G.
    Coles, W.
    Manchester, R.
    Edwards, R.
    Bailes, M.
    Sarkissian, J.
    Verbiest, J.
    van Straten, W.
    Hotan, Aidan
    Ord, Stephen
    Jenet, F.
    Bhat, N.
    teoh, A.
    Date
    2007
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    You, X. and Hobbs, G. and Coles, W. and Manchester, R. and Edwards, R. and Bailes, M. and Sarkissian, J. et al. 2007. Dispersion measure variations and their effect on precision pulsar timing. Monthly Notices of the Royal Astronomical Society. 378 (2): pp. 493-506.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1111/j.1365-2966.2007.11617.x
    ISSN
    1365-2966
    URI
    http://hdl.handle.net/20.500.11937/30716
    Collection
    • Curtin Research Publications
    Abstract

    We present an analysis of the variations seen in the dispersion measures (DMs) of 20-ms pulsars observed as part of the Parkes Pulsar Timing Array project.We carry out a statistically rigorous structure function analysis for each pulsar and show that the variations seen for most pulsars are consistent with those expected for an interstellar medium characterized by a Kolmogorov turbulence spectrum. The structure functions for PSRs J1045-4509 and J1909-3744 provide the first clear evidence for a large inner scale, possibly due to ion–neutral damping. We also show the effect of the solar wind on the DMs and show that the simple models presently implemented into pulsar timing packages cannot reliably correct for this effect. For the first time we clearly show how DM variations affect pulsar timing residuals and how they can be corrected in order to obtain the highest possible timing precision. Even with our presently limited data span, the residuals (and all parameters derived from the timing) for six of our pulsars have been significantly improved by correcting for the DM variations.

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