Abstract Details
| Name: Janhavi Baghel Affiliation: National Centre for Radio Astrophysics - Tata Institute of Fundamental Research, Pune Conference ID: ASI2024_796 Title : EVLA and uGMRT polarimetric study of the Palomar Green blazars Authors and Co-Authors : Janhavi Baghel 1, P. Kharb 1, T. Hovatta 2,3, E. Lindfors 2, Luis C. Ho 4,5, C. M. Harrison 6, Silpa S. 1, S. Gulati 1,7 Abstract Type : Poster Abstract Category : Galaxies and Cosmology Abstract : We will present the results of our ongoing study of the magnetic environments at kiloparsec scales of blazars in the Palomar-Green (PG) survey. Using the EVLA and uGMRT, we conducted radio polarimetric measurements of the 24 quasars and BL Lacs in the PG survey and found widespread polarization in the diffuse emission and in jets, lobes, hotspots, and cores. Within the framework of the blazar divide, we found that radio-loud quasars exhibited kiloparsec scale polarization in their radio cores parallel to the direction of their VLBI jets, while BL Lac objects did not exhibit any particular preference in orientation. This, along with other indications, suggests that unlike quasars, whose jet directions are essentially stable, several jet reorientations are taking place between parsec to kiloparsec scales in the case of BL Lac objects. Additionally, we have discovered a remarkable diversity in the radio morphologies of our optically chosen sample of radio-loud PG quasars, which is further supported by low-frequency, high-sensitivity radio surveys with less stringent selection effects than earlier research. This points to a more complex extended source population that might contain large numbers of hybrid radio galaxies, restarting and remnant radio galaxies. High-sensitivity kiloparsec-scale radio polarimetry allows us to study the jet-medium interactions and improve our understanding of the Fanaroff-Riley dichotomy and blazar divide in radio-loud AGN. |