Institute of Astronomy

AGN-driven outflows in simulated dwarf galaxies

SpeakerTalk DateTalk Series
Sophie Koudmani6 March 2019Institute of Astronomy Seminars

Abstract

The systematic analysis of optical large-scale surveys has revealed a population of dwarf galaxies hosting AGN, which have been confirmed by X-ray follow-up observations. Recently, the MaNGA survey identified six dwarf galaxies that appear to have an AGN that is preventing on-going star formation. This discovery challenges the canonical picture of quenching mechanisms where it is assumed that stellar feedback channels are solely responsible for regulating star formation in low-mass galaxies. It is therefore timely to study the physical properties of dwarf galaxies, in particular whether the presence of an AGN can affect their evolution. Using the moving mesh code AREPO, I have investigated different models of AGN activity, ranging from simple energy-driven spherical winds to collimated, mass-loaded, bipolar outflows in high resolution isolated simulations of dwarf galaxies hosting an active black hole. The simulations also include a novel implementation of star formation and mechanical supernova feedback. Here I will present the results from these simulations, focussing on the impact of AGN activity on star formation and outflow properties, and I will compare the outflow kinematics to observations from MaNGA.

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