Polarization of 3C 273 at 1365 MHz with 2 arcsec resolution. The plotted E-vectors show the orientation of the plane of linear polarization, their lengths are proportional to the degree of polarization. The observed pattern shows that the projected magnetic field is along the jet, and wraps around the end. This pattern, with the B-field aligned with the edges of the emission, is the general rule for synchrotron-emitting extragalactic radio sources. The extended emission to the SE of the jet is polarized at a level at or less than 15%.
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