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    The intra-hour variable quasar J1819+3845: 13-year evolution, jet polarization structure and interstellar scattering screen properties

    193849_193849.pdf (1.633Mb)
    Access Status
    Open access
    Authors
    de Bruyn, A.
    Macquart, Jean-Pierre
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    de Bruyn, A.G. and Macquart, J.-P. 2015. The intra-hour variable quasar J1819+3845: 13-year evolution, jet polarization structure and interstellar scattering screen properties. Astronomy and Astrophysics. 574: A125.
    Source Title
    Astronomy and Astrophysics
    DOI
    10.1051/0004-6361/201220522
    ISSN
    0004-6361
    Remarks

    Copyright © 2013 The European Southern Observatory (ESO). Reproduced with permission from Astronomy & Astrophysics (2014)

    URI
    http://hdl.handle.net/20.500.11937/7954
    Collection
    • Curtin Research Publications
    Abstract

    We examine the long-term evolution of the intra-hour variable quasar, J1819+3845, whose variations have been attributed to interstellar scintillation by extremely local turbulent plasma, located only 1–3 pc from Earth. The variations in this source ceased some time in the period between June 2006 and February 2007. The evolution of the source spectrum and the long-term lightcurve, and the persistent compactness of the source VLBI structure indicate that the cessation of rapid variability was associated with the passage of the scattering material out of the line of sight to the quasar. We present an extensive analysis on the linear polarization variations and their relation to total intensity variations. The proper motion of polarized features in the quasar jet is found to be sub-luminal. Systematic time delays between Stokes I, Q and U, in combination with the structure of the source obtained from 8.4 GHz VLBI data confirm the estimate of the screen distance: 1–2 pc, making the screen one of the nearest objects to the Solar system.

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