No CrossRef data available.
Published online by Cambridge University Press: 14 August 2015
The polarized optical and centimetric fluxes from BL Lac have their maxima at position angles which are roughly orthogonal. A similar tendency is found in other QSOs. If these fluxes are of synchrotron radiation then the magnetic fields associated with the optical and centimetric radiation are likely to be highly inclined with respect to each other. The implications of this are discussed.