Weizhe Liu (University of Maryland): "Exploring AGN Feedback in Dwarf Galaxies and Ultraluminous Infrared Galaxies"

Title: Exploring AGN Feedback in Dwarf Galaxies and Ultraluminous Infrared Galaxies

Abstract: AGN feedback may play a vital role in regulating the galaxy evolution and black hole growth. Powerful, AGN-driven outflow is believed to be one of the most import form of such feedback. In this talk, I will present our research on probing the fast outflows in a sample of nearby dwarf galaxies with AGN through optical integral field spectroscopy, and far-ultraviolet (FUV) spectroscopy. These outflows are primarily AGN-driven, and may have an impact on their host galaxies similar to that in the host galaxies of more luminous AGN. Next, I will introduce our project to explore AGN winds in ultraluminous infrared galaxies (ULIRGs) with FUV spectroscopy through O VI and N V absorptions where more and faster winds are found in X-ray weak sources, and through blueshifted Lyman alpha emission that are likely related to the fast winds. Finally, I will briefly describe the X-ray imaging of the metal-enriched halo extending ~40 kpc in a nearby ULIRG, which is probably affected by multiple AGN- and/or starburst-driven outflows over time.