Simulations reveal how rare stellar mergers shape galaxy chemistry
In short: Researchers using the IllustrisTNG simulations analyzed over 850 Milky Way-like galaxies to track how different elements accumulate over time. They found that europium, an element primarily produced by neutron star mergers, does not correlate with a galaxy's overall assembly history or its current physical properties.
The study used magnesium-to-iron ratios to test supernova models and europium-to-iron ratios to probe metal diffusion. While the total amount of europium depends on simulation settings, the wide variety of europium levels found in early, metal-poor stars is a robust result. A limitation is that the findings rely on specific modeling assumptions regarding how metals move through gas.
Why it matters: The chemical makeup of galaxies is shaped by complex internal processes like gas diffusion rather than just their overall growth history.
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Sources
- Summary by Intellect · source: Research: Naiman et al. (2018). First results from the IllustrisTNG simulations: a tale of two elements – chemical evolution of magnesium and europium. Monthly Notices of the Royal Astronomical Society.
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