报告题目：A link between wet major mergers and the formation of galactic discs

报 告 人：Prof. Athanassoulas Olymbie (LAM)

报告时间：Thursday, June 21, 2018, 02:00pm

报告地点：蒙民伟科技南楼S727

报告摘要：Using high resolution numerical simulations -- addressing dynamics, star formation, and chemical evolution -- we follow the formation of disc galaxies during wet major mergers in which each protogalaxy is embedded in a hot gaseous halo. We witness the destruction of the discs of the protogalaxies and the inside-out formation of a new disc, which is both massive and extended. This creates disc galaxies including both a thin and a thick disc component, with different kinematics and chemical structure. The thick disc does not form spirals, but does form a bar, with an elliptical shape, no ansae, much fatter than that of the thin disc and more metal poor. This provides a plausible explanation for the formation of a lens component. Last but not least, we will present results on metallicity and make comparisons with observations in the bar/bulge regions of our Galaxy.