Formation and Evolution of Galactic Center Bubbles: Insights from MHD Simulations

Philipp Girichidis

Wednesday, Dec. 4th, 14:30CET

The discovery of eRosita bubbles emerging from the Galactic center has raised significant questions about their origin and triggering mechanisms. To investigate this, we conduct magnetohydrodynamic (MHD) simulations of Milky Way-type galaxies, incorporating a detailed gravitational potential model of the galactic bar. This bar structure funnels gas into the central region, leading to concentrated episodes of star formation. The resulting stellar feedback drives strong bursts of energy, ultimately producing large-scale bubbles. Our study compares the resulting gas dynamics, gamma-ray, and X-ray emissions from these simulations with observational data of the Fermi/eRosita bubbles in the Milky Way. We explore the processes responsible for the formation and growth of these structures, providing new insights into the interaction between stellar feedback and galactic dynamics. Our results suggest that these bubbles are comparable to those observed, and we present a comprehensive illustration of their formation and evolution.