|The Australia Telescope National Facility Colloquium|
|15:30-16:30 Wed 02 Sep 2009|
ATNF Marsfield Lecture Theatre
(University of Cork)
Magnetic field properties of AGN jets from multi-frequency VLBA polarimetry - Shane O'Sullivan Colloquium
I will present results on multi-frequency (4.6, 5.1, 7.9, 8.9, 12.9, 15.4, 22 and 43 GHz) VLBA polarization observations of the parsec-scale region of several "blazar" jets. Observing across a wide range of frequencies, separated by short and long intervals, enabled reliable determination of the distribution of Faraday rotation on a range of jet scales and hence, the intrinsic jet magnetic field structure. Detection of transverse rotation measure (RM) gradients provided strong evidence for the presence of helical magnetic fields in the magneto-ionic material surrounding the jet. The results also show that the magnitude of the core RM increases systematically with frequency, simply implying that the electron density and/or magnetic field strength is increasing as we get closer to the central engine.
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