VLBI observations of extragalactic TeV gamma-ray sources

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Scientific paper

With the current sensitivity of TeV gamma ray telescopes only a handful of extragalactic sources have been detected. The size of the emission region implied by the hour-scale variability observed in the TeV emission from Mkn421 and Mkn501 is typically 100 times smaller than than probed by Very Long Baseline Interferometry observations. However, VLBI parsec-scale imaging provides the only direct information on the jet being ejected from the core. Here we describe VLBI and space-VLBI observations of TeV gamma-ray sources and the inferences that can be drawn on the jet behaviour between the TeV variability-scale and the VLBI milliarcsecond-scale.

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