Speaker
Description
AGN in the local universe exhibit an inverse correlation between radio-loudness and Eddington ratio. Furthermore, the radio emission in local radio-loud AGN is typically dominated by a large scale jet. I will present the results of a very long baseline interferometry study of eROSITA Final Equatorial Depth Survey J084222.9+001000, a super-Eddington ($\lambda_{\rm Edd, UV}$ = 1.4 and $\lambda_{\rm Edd,X-ray}$ = 12.8) quasar at z = 3.4 with a radio-loudness ratio of $R_{\rm obs}$ = 3.0. The radio morphology is composed of an unresolved core and a collimated jet extending $\gtrsim$ 745 pc. The jet has a relativistic speed of $v \gtrsim 0.19c$ and a viewing angle of $\phi \lesssim 79^\circ$ to the line of sight. The radio emission from the compact, flat-spectrum core dominates over that of the jet by over an order of magnitude. These properties differ significantly from low-z AGN, suggesting that this source maybe a member of a distinct, high-z AGN population which, in turn, has implications for AGN feedback and SMBH-galaxy co-evolution in the early universe.