SEMINÁRIO DO DEPARTAMENTO DE ASTRONOMIA
Ionized Outflows and AGN Feedback across galaxy types: Insights from Red Geysers and High-Redshift Quasars
a talk by Gabriele Ilha (USP/Brasil) - In-Person
Abstract:
Active galactic nucleus (AGN) feedback is a key mechanism in galaxy evolution, but its parameters are still challenging to constrain. In particular, the origin and effects of outflows in different galaxy types remain not fully understood. In this presentation, we bring together results from three studies investigating ionized gas outflows in galaxies hosting low and high-luminosity AGNs, focusing on Red Geysers and quasars at a redshift of approximately two. In the first study, we explored the relationship between radio emission and outflows in three quasars from the SUPER survey. We used VLT/SINFONI data and new radio observations from the VLA. In two of the targets, we detected extended radio structures aligned with the ionized gas, suggesting the presence of jets propagating from the nucleus to larger galactic scales. These results indicate a link between radio jets and ionized outflows in distant AGNs, similar to what is observed in nearby galaxies. In the second study, we analyzed the influence of AGN-driven winds on the oxygen abundance in Red Geysers using integral field spectroscopy from the MaNGA survey. Although these galaxies show higher Hα W80 values, indicative of outflows, compared to control galaxies and other AGNs, we found no correlation between W80 and oxygen abundance. This suggests that the winds in Red Geysers do not significantly change the chemical composition of their central regions. On the other hand, AGNs show a positive correlation between W80 and O/H, which may be related to star formation triggered by the outflows or the shared gas reservoir feeding both the AGN and star formation. In the third, ongoing study, we use high-resolution GMOS-IFU data to characterize ionized gas outflows in Red Geysers. We are estimating outflow rates and kinetic power to better understand the efficiency of low-luminosity AGN feedback and its role in quenching star formation in massive, quiescent galaxies.
Short-Bio:
Gabriele Ilha holds a Ph.D. in Physics (2023) from the Universidade Federal de Santa Maria (UFSM). She specializes in extragalactic astrophysics, with a particular focus on feedback processes from active galactic nuclei (AGN). From 2015 to 2022, she contributed to the MaNGA survey (Mapping Nearby Galaxies at Apache Point Observatory), part of the Sloan Digital Sky Survey. She is currently a postdoctoral researcher at the Universidade de São Paulo (USP) and recently completed a one-year postdoctoral internship at the European Southern Observatory (ESO) in Germany, where she investigated outflows in quasars and low-luminosity AGN.
Google Meet: https://meet.google.com/pcw-gmem-jyi
Link da transmissão: https://www.youtube.com/c/AstronomiaIAGUSP/live