Abstract
Intra-day variability (IDV) of active galactic nuclei (AGN) has been detected from gamma-rayenergies to radio wavelengths. At high energies, such variability appears to be intrinsic to thesources themselves. However, at radio wavelengths, brightness temperatures as high as 1018 to1021 K are encountered if the mv is intrinsic to the source. We discuss here the accumulating evidenceshowing that, at radio wavelengths where the highest brightness temperatures are encountered,interstellar scintillation (ISS) is the principal mechanism causing IDV. While ISS reduces the impliedbrightness temperatures, they still remain uncomfortably high.
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Jauncey, D.L. et al. (2001). Radio Intra-Day Variability: Answers and Questions. In: Strom, R., Bo, P., Walker, M., Rendong, N. (eds) Sources and Scintillations. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-1001-6_16
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DOI: https://doi.org/10.1007/978-94-010-1001-6_16
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