Giuseppe Cimò, L. Fuhrmann, T. P. Krichbaum, T. Beckert, A. Kraus, A. Witzel, J. A. Zensus
Published 2002-07-01Version 1
Intraday variability (IDV) of compact extragalactic radio sources is a complex phenomenon and shows a wavelength dependent mixture of refractive interstellar scintillation (RISS) (dominant at long cm-wavelengths) and source-intrinsic effects (dominant at shorter wavelengths). Detailed investigations of individual sources and new high frequency observations suggest a source-intrinsic contribution to the IDV pattern at least in some sources. However, the sizes of intraday variable sources at cm-wavelength are typically smaller than the scattering size set by the ISM in our galaxy and scintillation must be present, too. We present new IDV observations in different regimes (from cm to sub-mm wavelengths) and show how such multi-frequency study can be used as powerful instrument to describe different aspects of IDV.
Comments: 4 pages. Proceedings of the 6th European VLBI Network Symposium. Ros E., Porcas R.W., Lobanov A.P. and Zensus J.A. (eds.). June 25th-28th 2002, Bonn, Germany
Environment of compact extragalactic radio sources
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A Multi-Frequency Study of 3C309.1
