Progenitor-mass-dependent yields amplify intrinsic scatter in dwarf-galaxy elemental abundance ratios
Progenitor-mass-dependent yields amplify intrinsic scatter in dwarf-galaxy elemental abundance ratios
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DOI：
10.1093/mnras/stab2572
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发表时间：
2020-08
影响因子：
4.8
通讯作者：
Dhruv Muley;Coral Wheeler;P. Hopkins;A. Wetzel;A. Emerick;D. Keres̆
中科院分区：
文献类型：
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作者：
Dhruv Muley;Coral Wheeler;P. Hopkins;A. Wetzel;A. Emerick;D. Keres̆
我们探索了包括前身质量和金属丰度相关的产量、超新星发生率和能量学对矮星系中元素丰度比（特别是[α/Fe]）变化的影响。为了了解离散采样的初始质量函数中的可变金属产率如何影响 [α/Fe] 的分散和总体趋势，我们使用 NuGrid 数据库中取决于恒星祖体质量和金属丰度的核合成产率对矮星系 (M⋆(z = 0$) \sim 10^6\rm \, M_{\odot })$ 进行 FIRE 模拟。虽然 NuGrid 表现出的总 α 元素产量低于默认的 FIRE 产量，但我们发现，即使包括湍流金属扩散，其明确的质量依赖性也大大扩大了模拟 [Fe/H]-[α/Fe] 中的固有散射——这种现象在矮星系的一些观测中可见。
We explore the effect of including progenitor mass- and metallicity-dependent yields, supernova rates and energetics on variations in elemental abundance ratios (particularly [α/Fe]) in dwarf galaxies. To understand how the scatter and overall trends in [α/Fe] are affected by including variable metal yields from a discretely sampled initial mass function, we run FIRE simulations of a dwarf galaxy (M⋆(z = 0$) \sim 10^6\rm \, M_{\odot })$ using nucleosynthetic yields from the NuGrid data base that depend on the stellar progenitor mass and metallicity. While NuGrid exhibits lower aggregate α-element production than default FIRE yields, we find that its explicit mass dependence, even when including turbulent metal diffusion, substantially widens the intrinsic scatter in the simulated [Fe/H]-[α/Fe] – a phenomenon visible in some observations of dwarf galaxies.