Intraday Variability in Northern Hemisphere Radio Sources

Details Intraday Variability in Northern Hemisphere Radio Sources Intraday Variability in Northern Hemisphere Radio Sources

2001-11-13

arxiv.org/abs/astro-ph/0111232v1

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, to appear in: `AGN Variability Across the Electromagnetic Spectrum', a conference held at CSIRO, Sydney, 2

Scientific paper

10.1071/AS01085

We summarize results from flux density monitoring campaigns performed with the 100 meter radio-telescope at Effelsberg and the VLA during the past 15 yrs. We briefly discuss some of the statistical properties of the rapid variability from now more than 40 high declination sources, which show Intraday Variability (IDV). In general, IDV is more pronounced for sources with flat radio spectra and compact VLBI structures. The frequency dependence of the variability pattern varies with source and observing time. For 0917+62, we present new VLBI images, which suggest that the variability pattern is modified by the occurrence of new jet components. For 0716+71, we show the first detection of IDV at millimeter wavelengths (32 GHz). For the physical interpretation of the IDV phenomenon, a complex source and frequency dependent superposition of interstellar scintillation and source intrinsic variability should be considered.

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