Stergios Amarantidis
Instituto de Astrofisica e Ciencias do Espaço

Abstract
A persistent challenge in extragalactic astronomy revolves around formulating a model that unifies the various types of Active Galactic Nuclei (AGN). Current research commonly link optical AGN emission to the mechanical power of radio jets, assuming that both arise from the same episode of mass accretion onto a Super Massive Black Hole (SMBH). However, since accretion-rate variability is expected to occur on timescales shorter than a million years, the accretion disk responsible for launching the radio jets may differ significantly from the disk currently producing the observed optical emission. In this context, I have recently carried out the first systematic investigation of the observational consequences of the asynchronicity between optical (current) and radio (past) emission, prompting a critical re-assessment of the prevailing AGN unification framework. In this seminar, I will present this work and facilitate a discussion on its broader implications and future directions.

2026 March 20, 13:30

IA/U.Lisboa
Faculdade de Ciências da Universidade de Lisboa (C8.2.03)
Campo Grande, 1749-016 Lisboa