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    Observations of intrahour variable quasars: scattering in our Galactic neighbourhood

    Access Status
    Fulltext not available
    Authors
    Bignall, Hayley
    Jauncey, D.
    Lovell, J.
    Tzioumis, A.
    Macquart, Jean-Pierre
    Kedziora-Chudczer, L.
    Date
    2007
    Type
    Journal Article
    
    Metadata
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    Citation
    Bignall, H. and Jauncey, D. and Lovell, J. and Tzioumis, A. and Macquart, J. and Kedziora-Chudczer, L. 2007. Observations of intrahour variable quasars: scattering in our Galactic neighbourhood. Astronomical & Astrophysical Transactions. 26 (6): pp. 567-573.
    Source Title
    Astronomical & Astrophysical Transactions
    ISSN
    1476-3540
    URI
    http://hdl.handle.net/20.500.11937/39113
    Collection
    • Curtin Research Publications
    Abstract

    Interstellar scintillation (ISS) has been established as the cause of the random variations seen at centimetre wavelengths in many compact radio sources on timescales of a day or less. Observations of ISS can be used to probe structure both in the ionized insterstellar medium of the Galaxy and in the extragalactic sources themselves down to µ as scales. A few quasars have been found to show large amplitude scintillations on unusually rapid, intrahour timescales. This has been shownto be due to weak scattering in very local Galactic ‘screens’, within a few tens of parsec of the Sun. The short variability timescales allowdetailed study of the scintillation properties in relatively short observation periods with compact interferometric arrays. The three best-studied ‘intrahour variable’ quasars, PKS 0405-385, J1819+3845 and PKS 1257-326, have been instrumental in establishing ISS as the principal cause of intraday variability at centimetre wavelengths. Here we review the relevant results from observations of these three sources.

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      Bignall, Hayley; Macquart, Jean-Pierre; Jauncey, D.; Lovell, J.; Tzioumis, A.; Kedziora-Chudczer, L. (2006)
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      Bignall, Hayley; Jauncey, D.; Lovell, J.; Tzioumis, A.; Kedziora-Chudczer, L.; Macquart, Jean-pierre; Tingay, Steven; Rayner, D.; Clay, R. (2003)
      Rapid radio intraday variability (IDV) has been discovered in the southern quasar PKS 1257326. Fluxdensity changes of up to 40% in as little as 45 minutes have been observed in this source, making it, along with PKS 0405385 ...
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