Circular Polarization in the Blazar PKS 1127-145

Radio image of the quasar PKS 1127-145 obtained at a wavelength of 4 cm with the VLBA. This object has a bright core (bottom right) and a bent jet extending to the west. Depicted in greyscale is the faint circular polarization signal detected on the core.
Credit: D.C. Homan and J.F.C. Wardle.