Speaker
Description
Understanding the life cycle of radio emission in active galaxies remains a central challenge in extragalactic astrophysics. In our study, we aim to bridge the compact and giant phases of radio galaxy evolution by investigating the incidence of remnant and restarting activity across different evolutionary stages. In this talk, I will first focus on the first evolutionary stages and present a comprehensive multi-frequency spectral study of Compact Steep Spectrum (CSS) sources from the B3–VLA sample, combining new and archival observations from the Very Long Baseline Array (VLBA) and the Very Large Array (VLA). I will then move to the giant phase, reporting a spectral ageing analysis of three Giant Radio Galaxies (GRGs) in the COSMOS field using MeerKAT UHF- and L-band observations from the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) survey. Overall, these results provide new constraints on the duty cycle of radio-loud AGN and offer insights into the physical processes driving the growth, ageing, and recurrent activity of radio galaxies across cosmic time.