Bulgeless galaxies in TNG50 form later, maintain high disc fractions since z~1, and preferentially experience gas-rich coplanar mergers that preserve discs, unlike bulge-dominated galaxies.
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Bulgeless Evolution And the Rise of Discs (BEARD) II. The role of mergers in shaping the Milky Way analogues in TNG50
Bulgeless galaxies in TNG50 form later, maintain high disc fractions since z~1, and preferentially experience gas-rich coplanar mergers that preserve discs, unlike bulge-dominated galaxies.