Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    First results from MASIV: The microarcsecond scintillation-induced variability survey

    Access Status
    Open access via publisher
    Authors
    Lovell, J.
    Jauncey, D.
    Bignall, Hayley
    Kedziora-Chudczer, L.
    Macquart, Jean-Pierre
    Rickett, B.J.
    Tzioumis, A.
    Date
    2003
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Lovell, J.E.J. and Jauncey, D.L. and Bignall, H.E. and Kedziora-Chudczer, L. and Macquart, J.-P. and Rickett, B.J. and Tzioumis, A.K. 2003. First results from MASIV: The microarcsecond scintillation-induced variability survey. The Astronomical Journal 126: pp. 1699-1706.
    Source Title
    The Astronomical Journal
    DOI
    10.1086/378053
    ISSN
    0004-6256
    URI
    http://hdl.handle.net/20.500.11937/22903
    Collection
    • Curtin Research Publications
    Abstract

    We are undertaking a large-scale, microarcsecond scintillation-induced variability survey, MASIV, of the northern sky (decl. > 0°) at 4.9 GHz with the VLA. Our objective is to construct a sample of 100 to 150 scintillating extragalactic sources with which to examine both the microarcsecond structure and the parent populations of these sources, and to probe the turbulent interstellar medium responsible for the scintillation. We report on our first epoch of observations, which revealed variability on timescales ranging from hours to days in 85 of 710 compact flat-spectrum sources. The number of highly variable sources, those with rms flux density variations greater than 4% of the mean, increases with decreasing source flux density, but rapid, large amplitude variables such as J1819+3845 are very rare. When compared with a model for the scintillation due to irregularities in an electron layer 500 pc thick, our preliminary results indicate maximum brightness temperatures 1012 K, similar to those obtained from VLBI surveys even though interstellar scintillation is not subject to the same angular resolution limit.

    Related items

    Showing items related by title, author, creator and subject.

    • Rapid interstellar scintillation of PKS 1257-326: Two-station pattern time delays and constraints on scattering and microarcsecond source structure
      Bignall, Hayley; Macquart, Jean-Pierre; Jauncey, D.; Lovell, J.; Tzioumis, A.; Kedziora-Chudczer, L. (2006)
      We report measurements of time delays of up to 8 minutes in the centimeter-wavelength variability patterns of the intrahour scintillating quasar PKS 1257326, as observed between the VLA and the ATCA on three separate ...
    • Diffractive interstellar scintillation of the quasar J1819+3845 at 21 cm*
      Macquart, Jean-pierre; de Bruyn, A. (2009)
      We report the discovery of fast, frequency-dependent intensity variations from the scintillating intra-day variable quasar J1819+3845 at 21 cm which resemble diffractive interstellar scintillations observed in pulsars. ...
    • Interstellar and intergalactic scattering as astrophysical probes
      Koay, Jun Yi (2012)
      The scattering of radio waves and multipath propagation in the interstellar medium (ISM) of our Galaxy produces various observable phenomena such as the interstellar scintillation (ISS) and angular broadening of compact ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.