Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-03-27
Astronomy and Astrophysics
Astrophysics
10 pages, 4 figures, Accepted for publication in The Astrophysical Journal (corrected typos in previous version)
Scientific paper
10.1086/321568
We present circular polarization results from a 5 GHz survey of the parsec-scale polarization properties of 40 AGN made with the VLBA. We find 11 circular polarization detections at the 3 sigma level or higher. This nearly quadruples the number of sources detected in circular polarization at VLBI resolution. We find no correlation between fractional linear and circular polarization across our sample. A likely explanation is external Faraday depolarization in the cores of AGN which reduces linear polarization but leaves circular polarization unchanged. In comparing ours and other recent results to observations made 20 years ago, we find that, in five of six cases, sources have the same sign of circular polarization today as they did 20 years ago. This suggests the presence of a long term property of the jets, such as the polarity of a net magnetic flux, which is stable on time-scales much longer than those of individual outbursts.
Attridge Joanne M.
Homan Daniel C.
Wardle John F. C.
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