Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714247a&link_type=abstract
American Astronomical Society, AAS Meeting #217, #142.47; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We have monitored a group of bright AGN at 14.5, 8.0 and 4.8 GHz with the University of Michigan 26-meter telescope to better define the variability of these active sources in Stokes V. The stability in the sign of the circular polarization has implications for the mechanism believed to be responsible for the emission: specifically tests of the proposed links between the Black Hole - accretion disk and the radio jet. The only source in which we find a stable sign over many years at all three frequencies is OV-236. This polarity is maintained throughout several outbursts in both linear and circular polarization. In other sources we typically find evidence for a preferred polarity for an extended period intermixed with well-defined flips in sign for durations of months to a few years. A good example of this behavior is exhibited by 3C 279. In several sources we also observe differences in polarity between the three frequencies at a single epoch. This work is supported by NSF grant AST-0607523.
Aller Hugh D.
Aller Margo
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