Looking at radio-quiet AGN with radio polarimetry

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Published: Mar 14, 2022
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DOI: https://doi.org/10.31059/aat.vol3.iss1.pp17-22

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Sasikumar Silpa
National Centre for Radio Astrophysics – Tata Institute of Fundamental Research, S. P. Pune University Campus, Ganeshkhind, Pune 411007, India
Preeti Kharb
National Centre for Radio Astrophysics – Tata Institute of Fundamental Research, S. P. Pune University Campus, Ganeshkhind, Pune 411007, India

Abstract

The dominant radio emission mechanism in radio-quiet quasars (RQQs) is an open question. Primary contenders include: low-power radio jets, winds, star-formation and coronal emission. Our work suggests that radio polarization and emission-line studies can help to distinguish between these scenarios and determine the primary contributor. Our multi-frequency, multi-scale radio polarization study has revealed a composite jet and "wind" radio outflow in the radio-intermediate quasar, III Zw 2, as well as in the BALQSO, Mrk 231. Our radio polarization study in conjunction with the [O III] emission-line study of five type 2 RQQs have provided insights on the interplay of jets/winds and emission-line gas. These sources reveal an anti-correlation between polarized radio emission and [O III] emission. This is similar to that observed in some radio-loud active galactic nuclei (AGN) in the literature and suggests that the radio emission could be depolarized by the emission-line gas. Overall, our work suggests that a close interaction between the radio outflow and the surrounding gaseous environment is likely to be responsible for their stunted form in RQ and RI AGN.

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How to Cite
Silpa S. , Kharb P., 2022. Acta Astrophysica Taurica, vol. 3, no. 1, pp. 17–22. DOI: 10.31059/aat.vol3.iss1.pp17-22
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Vol. 3 No. 1 (2022)
Section
Crimean-2021 AGN Conference proceedings
Copyright and publishing rights for texts published in Acta Astrophysica Taurica is retained by the authors, with first publication rights granted to the journal.Texts are free to use with proper attribution and link to the licensing (Creative Commons Attribution 4.0 International).

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