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Examples of Extreme Intraday Variability

  • Lucyna Kedziora-Chudczer (a1) (a2), David L. Jauncey (a2), Mark A. Wieringa (a2), Anastasios K. Tzioumis (a2) and Hayley E. Bignall (a3)...

Abstract

We present results of the ATCA IDV Survey of southern extragalactic radio sources. We discuss briefly the properties of the 22 new intraday variable sources discovered in the Survey. The follow-up observations of a few extreme examples of strong intraday variability are presented. We find that the characteristics of the total flux density fluctuations at different wavelengths are consistent with intersteller scintillations (ISS) of the microarcsecondsize soorten components. However, the scintillating components of a few extreme IDVs are characterized by the brightness temperatures far exceeding the TB = 1012 K limit. The relativistic beaming invoked in such sources would require Doppler factors up to as high as δ ~ 103.

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References

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Duncan, R.A., White, G.L., Wark, R., Reynolds, J.E., Jauncey, D.L., Norris, R.P. and Taaffe, L.: 1993, Proc. ASA 10, 310P.
Kcdziora-Chudczer, L.L., Jauncey, D.L., Wieringa, M.H., Reynolds, J.E. and Tzioumis, A.K.: 2000, MNRAS, submitted.
Kedziora-Chudczer, L.L., Jauncey, D.L., Wieringa, M.H., Walker, M.A., Nicolson, G.D., Reynolds, J.E. and Tzioumis, A.K.: 1997 ApJL 490, L9.
Macquart, J.-P, Kedziora-Chudczer, L., Jauncey, D.L. and Rayner, D.P.: 2000, to appear in ApJ 538.
Rickett, B.J., Quirrenbach, A., Wegner, R., Krichbaum, T.P. and Witzel, A.: 1995, A&A 293, 479P.
Wagner, S.J. and Witzel, A.: 1995, ARA&A 33, 163P.
Witzel, A., Heeschen, D.S., Schalinski, C.J. and Krichbaum, T.P.: 1986, Mitt. Astron. Ges. 65, 239P.

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