Faraday Rotation and Depolarization in AGN Jets

3C 273, epoch 1999.37
Total intensity, “B” vectors
(derotated EVPA vectors +90 o ),
and RM distribution.
The “B” field is mostly parallel to the
jet (except at U4 which looks like a
shock).
We infer that B torroidal
is not larger in
magnitude than the B field in the
synchrotron emitting region.
In U8 (v app
=11.7 c), the standard
calculation yields B = 8 x 10 -3 G
(critical angle to the line of sight,
equipartition, γ min
= 1). This is in the
jet frame.