| Abstract : | I will present the results from the current study of the kiloparsec scale radio polarimetric observations of 24 quasars and BL Lacs belonging to the Palomar-Green (PG) sample. EVLA and uGMRT polarimetric data show extensive polarization structures in cores, jets, lobes and hotspots of the radio-loud quasars. A large fraction of the PG quasars show restarted, distorted (S- or X-shaped), or hybrid Fanaroff-Riley (FR) morphology. We attribute this to the optical/UV selection criteria of the PG sample that remains unbiased at radio frequencies. Preliminary results indicate that B-fields in the quasar jets are poloidal whereas BL Lacs show toroidal B-fields extending up to kpc scales. This is consistent with the Very long baseline interferometry (VLBI) observations of blazars that have found the same corresponding division in the magnetic field structures at parsec scales. These results suggest that both intrinsic (central-engine-related) as well extrinsic (environment-related) factors play a crucial role in the creation of the blazar subclasses. |
