In simulated Milky Way-like galaxies, either a retrograde merger or an early clumpy star-formation phase suppresses star formation and creates the observed chemical bimodality; only clumpy models also produce old, α-poor disk stars.
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GASTRO library II: Exploring Chemical Bimodalities in Disk Galaxies with GSE-like Mergers and Massive Star-forming Clumps
In simulated Milky Way-like galaxies, either a retrograde merger or an early clumpy star-formation phase suppresses star formation and creates the observed chemical bimodality; only clumpy models also produce old, α-poor disk stars.