Understanding the trends in the Milky Way’s bulge

I demonstrate that all trends in chemistry, age and kinematic spaces of the bulge stellar populations can be understood by a model of the bulge forming purely out of the evolution of the bar with only a ~1% addition of an accreted population. This accreted population is probably the stellar halo of the Milky Way. The trends are driven by a process we refer to as kinematic fractionation, because it separates out populations on the basis of their kinematics at the time of bar formation. I demonstrate some predictions of the model and present early evidence that external galaxies appear to follow similar trends.

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