Abstract Details

Name: Silpa Sasikumar
Affiliation: NCRA-TIFR
Conference ID: ASI2021_299
Title : A radio polarization study of III Zw 2 revealing a composite jet and wind outflow
Authors and Co-Authors : Silpa S. (NCRA-TIFR), P. Kharb (NCRA-TIFR), C. M. Harrison (Newcastle University), L. C. Ho (KIAA-PKU), M. E. Jarvis (MPA/ESO/LMU), C. H. Ishwara-Chandra (NCRA-TIFR), B. Sebastian (NCRA-TIFR)
Abstract Type : Oral
Abstract Category : Extragalactic Astronomy
Abstract : The origin of radio emission in radio-intermediate quasars (RIQs) is poorly understood. Radio polarization observations can help to distinguish between the possible contenders such as winds (starburst-driven or AGN-driven) and AGN jets, based on the differences in their degree of polarization, magnetic (B-) field structures and rotation measures. We will be presenting the results from our multi-frequency radio polarization study of the RIQ, III Zw 2, with the uGMRT at 685 MHz and the VLA at 5 and 34 GHz. We detect a kpc-scale outflow in III Zw 2, harbouring toroidal B-fields. The outflow in III Zw 2 appears to be a combination of an AGN jet and a magnetically-driven AGN wind. Both uGMRT and EVLA images of III Zw 2 reveal B-fields to be aligned with the edges of the lobe, consistent with B-field amplification due to shock compression, similar to radio-loud quasars. The bow-shock-like morphology of the jet terminal regions is consistent with restarted jet activity in III Zw 2, which is in turn consistent with its "sputtering" nature.