Jetted radio-quiet quasars at z>5
Tullia Sbarrato, Gabriele Ghisellini, Gabriele Giovannini, Marcello, Giroletti

TL;DR
This study uses JVLA observations to reveal that many high-redshift, radio-quiet quasars host powerful relativistic jets, suggesting jets are more common in early massive black holes than previously thought, impacting our understanding of black hole growth.
Contribution
It demonstrates that radio-quiet high-redshift quasars can harbor powerful jets, challenging the traditional classification and implying a higher prevalence of jetted AGN in the early Universe.
Findings
Radio-quiet quasars can host powerful relativistic jets.
The density of jetted AGN at high redshift is comparable to the overall AGN population.
Jets may significantly influence the rapid growth of massive black holes.
Abstract
We report on the JVLA observations of three high redshift Active Galactic Nuclei (AGN), having a black hole mass estimated to be among the largest known. Two of them, SDSS J0100+2802 and SDSS J0306+1853 at redshift 6.326 and 5.363 respectively, are radio-quiet AGN according to the classic definition, while the third (B2 1023+25 at z=5.284) is a powerful blazar. The JVLA data clearly show a radio structure in the first source, and a radio emission with a relatively steep radio spectrum in the second one, demonstrating the presence of a radio jet and a diffuse component. Therefore, being radio-quiet does not exclude the presence of a powerful relativistic jet with important consequences on the population studies and on the ratio between jetted and non-jetted AGN. We can estimate the viewing angle of these jets, and this allows us to find, albeit with some uncertainty, the density of black…
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