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Unformatted text preview: Tracking the features within small-scale jets has revealed interesting complications. The paths are not always radial to the nucleus, usually taken as the source with the flattest spectrum in ambiguous cases. This is based on the general principle that synchrotron spectra are flattened at lower frequencies by self-absorption, so the densest plasma will have a flat or inverted spectrum. An interesting case is 3C 345, in which emission features repeatedly appear off the core and follow fairly consistent nonradial paths.This can be seen in Fig. 1 of Zensus et al. (1995 ApJ 443, 35, courtesy of the AAS) in which a new component appears in late 1985, brightens, and moves outward changing its relative position angle in the process: Such motions, and the pronounced wrapped filamentary structure seen in nearby jets such as M87 and Centaurus A, suggest an important role for motion in helical patterns. This is easier to understand if much of what we see isn't physical blobs but enhancements in particle emission...
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- Fall '10