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    On rapid interstellar scintillation of quasars: PKS 1257-326 revisited

    190025_73153_Bignall___2__download.pdf (254.6Kb)
    Access Status
    Open access
    Authors
    Bignall, Hayley
    Hodgson, J.
    Date
    2012
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Bignall, Hayley E. and Hodgson, Jeffery A. 2012. On rapid interstellar scintillation of quasars: PKS 1257-326 revisited, in Griffin R.E., Hanisch R.J., Seaman, R.L. (ed), 285th Symposium of the International-Astronomical-Union, Sep 19 2011, pp. 129-132. St Catherine's College, Oxford, England: Cambridge University Press.
    Source Title
    New Horizons in Time-Domain Astronomy
    Source Conference
    285th Symposium of the International-Astronomical-Union
    DOI
    10.1017/S1743921312000439
    ISSN
    1743-9213
    Remarks

    Published in Proceedings of the International Astronomical Union 2012

    URI
    http://hdl.handle.net/20.500.11937/7455
    Collection
    • Curtin Research Publications
    Abstract

    The line of sight towards the compact, radio loud quasar PKS 1257-326 passesthrough a patch of scattering plasma in the local Galactic ISM that causes large and rapid,intra-hour variations in the received flux density at centimetre wavelengths. This rapid interstellarscintillation (SS) has been occurring for at least 15 years, implying that the scattering“screen” is at least 100 AU in physical extent. Through observations of the ISS we have measuredmicroarcsecond-scale “core shifts” in PKS 1257-326, corresponding to changing opacityduring an intrinsic outburst. Recent analysis of VLA data of a sample of 128 quasars found 6sources scintillating with a characteristic time-scale of < 2 hours, suggesting that nearby scatteringscreens in the ISM may have a covering fraction of a few percent. That is an importantconsideration for proposed surveys of the transient and variable radio sky

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