A Polarization Study of 3 Blazars using the uGMRT at ~600 MHz
  We present results from our radio polarimetric study with the upgraded Giant
Metrewave Radio Telescope (uGMRT) at Band 4 (550-850 MHz) of 3 blazars:
radio-loud quasars 3C390.3, 4C71.07 and BL Lac object 1ES 2344+514. The aim of
this study was (i) to carry out a feasibility study for Band 4 polarization
with the uGMRT, and (ii) to compare and contrast the kpc-scale polarization
properties between the blazar sub-classes. We have detected linear polarization
in all the three sources. The degree of linear polarization in the cores of the
two quasars is higher than in the BL Lac object, consistent with similar
differences observed on parsec-scales in blazars. The highest fractional
polarization of 15% is observed in the hotspot region of 3C390.3, which also
shows extended polarized lobe structures. 1ES 2344+514 shows a core-halo
structure whereas 4C71.07 remains unresolved. A rotation of polarization
electric vectors along the northern hotspot of 3C390.3, and the core of 1ES
2344+514, suggest jet bending. Greater depolarization in the southern lobe of
3C390.3 compared to the northern lobe indicates the presence of the
`Laing-Garrington effect'. Multi-frequency uGMRT polarimetric data are underway
to study the kpc-scale rotation measures across these sources in order to look
for differences in the surrounding media.
