Speaker
Description
Hyper-luminous QSOs (HyLQSOs, i.e. $L_{bol}>10^{47}$ erg/s), are powered by the most massive, highly-accreting supermassive black holes (SMBHs, i.e. $M_{BH} >$ 10$^{9}$ $M_{\odot}$). Following the nowadays consensus view on SMBH-host galaxy co-evolution, the huge amount of energy released by highly-accreting SMBHs in HyLQSOs is able to strongly affect the evolution of the host galaxy by heating and expelling the interstellar medium (ISM) (the so-called ``AGN feedback" mechanism). The radio band can provide us with fundamental information on the presence of jets, their interplay with winds, and in general on the presence of a possible young radio phase at cosmic noon, and the long-standing questions about the radio-loud/radio-quiet dichotomy across cosmic epochs.
To this purpose, between 2022 and 2025, we realized a radio multiwavelenght survey of the WISSH sample with the uGMRT and JVLA. This, along with the LoTSS archival data, allowed us to cover a wide range of frequencies, spanning from 0.15 to 12 GHz. In particular, we managed to reach a sensitivity threshold of $\sim$30 $\mu$Jy, an order of magnitude below past or current radio surveys. This allowed us to reveal faint radio emission from the cosmic noon quasars, reaching a detection rate of $\sim$74\% at 3 GHz. This will enable us to extend the study of the radio-optical and radio-X-ray correlations at their brightest end.
These sources represent an optimal testing ground for SKAO. While SKAO alone will cover the whole frequency range of our survey, its sensitivity will allow us to go deeper by an order of magnitude, giving us the opportunity to explore even more the radio properties of this class of faint quasars.
In this talk I will give an overview of the results obtained with our survey and explore the new possibilities with the income of the SKAO.
| Topics | Galaxy Evolution & AGN |
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