An Investigation of Local Bubble Analogues in ECOGAL Galaxies

Shuyu Tan

Wednesday, Dec. 4th, 9:40CET

Our Sun is currently located near the centre of the Local Bubble, a superbubble whose origin, while still uncertain, is commonly believed to result from multiple supernova explosions in a young star cluster around ten million years ago. Superbubble shells transfer concentrated energy and momentum from supernovae to the surrounding interstellar medium (ISM) and are believed to trigger localised star formation. Leveraging high-quantity observations of the rich structures in the local ISM and precious Gaia astrometry, we perform high-resolution zoom-in hydrodynamical simulations of Milky Way-like galaxies, incorporating a realistic Galactic potential, environment and star formation processes using the moving-mesh code Arepo, to examine reliable analogues of the Local Bubble. This allows us, for the first time at this level of detail, to investigate its likely origin, evolutionary history, and associated star formation. In our initial results, we identified a variety of superbubbles with sizes and ages similar to those observed in the Local Bubble, providing new insights into its unresolved origin. We also explored the physical conditions and the associated star formation activities within these superbubbles.