Lunch talk on Dec. 25, 2023

AGN feedback in Dwarf Galaxies

Speaker: Weizhe Liu (University of Arizona)

Venue: Video Conference

Time: 12:30 PM, Monday, Dec. 25, 2023

Abstract: 

Feedback processes likely play a vital role in the evolution of dwarf galaxies, given their shallow potential well. While stellar processes have long been considered the primary source of feedback, it is still debated whether such stellar feedback is effective enough to reproduce the properties of dwarf galaxies we see today. Given the increasing number of AGN detected in dwarf galaxies, it is crucial to also evaluate the impact of AGN feedback in dwarf galaxies. In this talk, I will present our exploration of AGN feedback in dwarf galaxies, by observing the fast outflows in a sample of nearby dwarf galaxies with AGN through optical integral field spectroscopy and far-ultraviolet spectroscopy. These outflows are faster than those observed in star-forming galaxies with similar star formation rates. They are mainly photoionized by the AGN, and a portion of them may escape the galaxies. They are primarily AGN-driven and may have an impact on their host galaxies similar to those taking place in the more luminous AGN with more massive hosts.

Report PPT:  SWIFAR_Weizhe Liu.pdf