Radio Emission as a Tracer of AGN Feedback Across Cosmic Time

AGN feedback is a key ingredient in models of galaxy evolution, regulating star formation and driving the observed correlations between supermassive black holes and their host galaxies. In this context, the role of radio-quiet AGN, much more common than their jet-dominated radio-loud counterpart, has become progressively more recognised. The radio emission in these sources can arise from coronal activity, star-formation activity, winds and weak jets, providing a unique window into feedback processes. In particular, understanding the impact of low-power radio jets and winds on the host galaxy and their relation with outflows in different gas phases is now urgent for our comprehension of AGN feedback and galaxy evolution. In this talk I will emphasise the value of both single-object and statistical studies on the origin of the radio emission in radio-quiet AGN. I will show key results from the X-ray-selected radio-quiet AGN of SUBWAYS (z ~0.1–0.5, Lbol~10^(45–46)), where ultra-fast outflows have been detected in the X-rays. Radio follow-up observations hint at a connection between the latter and outflows traced by the extended radio emission. I will also present some preliminary results on XID2028, an obscured quasar at z=1.59, where the combination of VLA, MIRI, NIRspec and ALMA data provides stronger constraints on the nature of the outflows, and their impact on the host galaxy. These results confirm that low-power jets or winds can play a relevant role in AGN feedback.