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Paper: Relativistic Jets in Blazars: Where the Action Is
Volume: 300, Radio Astronomy at the Fringe
Page: 133
Authors: Marscher, A.P.
Abstract: I discuss detailed multi-waveband monitoring of several compact extragalactic radio sources. X-ray dips followed by superluminal ejections in 3C 120 support the super-massive black hole accretion model and place the core of the radio jet at least 0.3 pc from the central engine. The relative timing of radio, optical, X-ray, and γ-ray events in blazars implies that the high-frequency emission occurs at or downstream of the radio core rather than closer to the central engine. Apparent speeds of radio knots are as high as ∼ 40c. I relate these observations to the brightness temperature problem and conclude that relativistic beaming—sometimes extreme—is the most likely solution for the majority of blazars. In general, incoherent synchrotron and inverse Compton radiation in relativistic jets explains the observations well.
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