Galaxy mergers and the mass-metallicity relation: Evidence for nuclear metal dilution and flattened gradients from numerical simulations
Recent results comparing interacting galaxies to the mass-metallicity relation show that their nuclear oxygen abundances are unexpectedly low. We present analysis of N-body/smoothed-particle hydrodynamics numerical simulations of equal-mass mergers that confirm the hypothesis that these underabundances are accounted for by radial inflow of low-metallicity gas from the outskirts of the two merging galaxies. The underabundances arise between first and second pericenters, and the simulated...[Show more]
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|Source:||Astrophysical Journal Letters|
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