A rapid early collapse followed by a delayed, lower-efficiency second gas infall best reproduces the Milky Way bulge's metallicity, alpha-element, and age patterns.
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The Two-infall Model Revisited: Constraints on Milky Way Bulge Assembly from >30,000 Galactic Chemical Evolution Models and Machine Learning
A rapid early collapse followed by a delayed, lower-efficiency second gas infall best reproduces the Milky Way bulge's metallicity, alpha-element, and age patterns.