Radio Galaxies in the Chandra Era

Physics

Scientific paper

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Scientific paper

Pc-scale rotation measures have been obtained with the Very Long Baseline Array for a number of radio bright, beamed AGNs, but the plane-of-sky radio galaxies have typically remained undetected in polarized light. We present the results of our VLBA polarization experiment at three frequencies for the FRI radio galaxies 3C66B, 3C78 and 3C264, including pc-scale rotation measures for 3C78 and 3C264. A clear gradient in the Faraday rotation measure is detected across the jet of 3C78, suggesting the presence of a helical magnetic field associated with this jet. The similarity in the pc-scale rotation measures of the few FRI and FRII jets studied so far, could be reflective of a common origin. We discuss our results in the wider context of the nature of FRI and FRII jets.

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