Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.0808l&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #08.08; Bulletin of the American Astronomical Society, V
Other
3
Scientific paper
The MOJAVE program is currently studying relativistic jet phenomena in nearly two hundred of the brightest AGN in the northern sky. By obtaining regularly-spaced, milliarcsecond-resolution full polarization images with the VLBA, we are the first study to investigate the structural evolution of AGN jets on decade-long timescales. Our sample is complete with respect to compact radio flux density, and consists mainly of highly beamed blazars in which the jet is pointing nearly directly at us. In our sample we have found several sources in which successive bright jet features travel outwards at superluminal speed after emerging from the base of the jet, but along distinctly different position angles. In some cases the ejection direction oscillates with time, as might be expected for a precessing jet nozzle. We discuss how these variations can lead to apparently curved jet morphologies, and how these differ from other jets in which features appear to accelerate along curved trajectories.
The MOJAVE project is supported under National Science Foundation grant 0406923-AST and a grant from the Purdue Research Foundation.
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