用无线电偏振测量法观察无线电宁静AGN
Looking at Radio-Quiet AGN with Radio Polarimetry
摘要：
射电宁静类星体的主要射电辐射机制是一个悬而未决的问题。主要的竞争者包括：低功率无线电喷流，风，恒星形成和日冕发射。我们的工作表明，无线电极化和发射线的研究可以帮助区分这些情况，并确定主要的贡献者。我们的多频率，多尺度的无线电极化研究揭示了一个复合喷流和“风”无线电流出的无线电中间类星体，III Zw 2，以及在BALQSO，Mrk 231。我们的无线电极化研究结合[O III]发射线研究的5个2型RQQs提供了见解的喷流/风和发射线气体的相互作用。这些来源揭示了极化无线电发射和[O III]发射之间的反相关性。这与文献中某些射电强活动星系核的观测结果相似，表明射电辐射可能被发射线气体去极化。总的来说，我们的工作表明，无线电外流和周围的气体环境之间的密切相互作用可能是负责他们的发育不良的形式在RQ和RI AGN。
英文摘要：
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 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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