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Examples of Extreme Intraday Variability

  • Lucyna Kedziora-Chudczer
  • David L. Jauncey
  • Mark A. Wieringa
  • Anastasios K. Tzioumis
  • Hayley E. Bignall
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Abstract

We present results of the ATCA IDV Survey of southern extragalactic radio sources. Wediscuss briefly the properties of the 22 new intraday variable sources discovered in the Survey. Thefollow-up observations of a few extreme examples of strong intraday variability are presented. Wefind that the characteristics of the total flux density fluctuations at different wavelengths are consistentwith intersteller scintillations (ISS) of the microarcsecondsize soorten components. However, thescintillating components of a few extreme IDV s are characterized by the brightness temperatures farexceeding the T B = 1012 K limit. The relativistic beaming invoked in such sources would requireDoppler factors up to as high as ´ ~ 103.

Keywords

Brightness Temperature Radio Source Coherent Emission Doppler Factor Inverted Spectrum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 2001

Authors and Affiliations

  • Lucyna Kedziora-Chudczer
    • 1
    • 2
  • David L. Jauncey
    • 2
  • Mark A. Wieringa
    • 2
  • Anastasios K. Tzioumis
    • 2
  • Hayley E. Bignall
    • 3
  1. 1.Anglo-Australian ObservatoryAustralia
  2. 2.Australia Telescope National FacilityAustralia
  3. 3.University of AdelaideAustralia

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