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    Emergence and disappearance of microarcsecond structure in the scintillating quasar J1819+3845

    Access Status
    Open access via publisher
    Authors
    Macquart, Jean-pierre
    de Bruyn, A.
    Date
    2007
    Type
    Journal Article
    
    Metadata
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    Citation
    Macquart, Jean-pierre and de Bruyn, A. 2007. Emergence and disappearance of microarcsecond structure in the scintillating quasar J1819+3845. Monthly Notices of the Royal Astronomical Society. 380 (1): pp. L20-L24.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1111/j.1745-3933.2007.00341.x
    ISSN
    0035-8711
    Faculty
    Faculty of Science and Engineering
    Curtin Institute of Radio Astronomy
    URI
    http://hdl.handle.net/20.500.11937/41593
    Collection
    • Curtin Research Publications
    Abstract

    The 4.8-GHz light curves of the scintillating intraday variable quasar J1819+3845 during 2004-2005 exhibit sharp structure, down to a time-scale of 15 min, that was absent from lightcurves taken prior to this period and from the 2006 light curves. Analysis of the light curve powerspectra show that the variations must be due to the emergence of new structure in the source.The power spectra yield a scattering screen distance of 3.8 0.3 pc for a best-fitting vISS = 59 0.5 km s-1 or 2.0 0.3 pc for the scintillation velocity reported by Dennett-Thorpe & de Bruyn. The scattering medium is required to be exceptionally turbulent, with C2N 0.7L-1 pc m-20/3 for scattering material of thickness Lpc pc along the ray path. The 2004 power spectrum can be explained in terms of a double source with a component separation 240 15 as in 2004.

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