Speaker
Description
Firstly, I will present our work on linking the radio-AGN life-cycle with feedback on the ionized gas. By combining the LOFAR survey LoTSS with other large radio surveys like FIRST and VLASS, we identified a sample of 5,700 radio-AGN at various evolutionary stages and ~150 restarted AGN. We characterized the [OIII] kinematics of the sample and found a significant correlation between the feedback on ionized gas and the evolutionary stages of the radio-AGN. Our findings show that feedback is strongest (~3 times more likely) when the radio-AGN (and the jets) are young, and becomes much gentler at later evolutionary stages. Additionally, using the sample of restarted AGN selected with the high sensitivity of LOFAR, we discovered that the impact on ionized gas is linked only to the most recent phase of jet activity.
Furthermore, I will present results from our study combining LoTSS and MaNGA (optical IFU survey) to investigate the relationship between the spatial extent of disturbed gas and radio luminosity in AGN in the local Universe. While such relationships have been studied for optical luminosity in Seyferts and Quasars, none has been found with radio luminosity. We find that the spatial extent of the most disturbed ionized gas increases with radio luminosity, with the gas being disturbed up to 0.75$\times R_{eff}$ (effective radius) of the galaxy. This indicates that radio-AGN impact is typically strongest in the central region, beyond which different power sources do not significantly disturb the gas.
Through these studies, I aim to demonstrate the immense value of LOFAR surveys and their capability to enhance our understanding of galaxy evolution when combined with surveys at other frequencies.
| What is your career stage? | Non-tenured scientist (post PhD) |
|---|---|
| Which telescopes do you use / are you affiliated with? | VLA, LOFAR, GMRT |
