论文标题
湍流混合对二进制中子星合并的银河系R-过程富集的影响
The impact of turbulent mixing on the galactic r-process enrichment by binary neutron star mergers
论文作者
论文摘要
我们研究了在二元中子星（BNS）合并中产生的快速中子捕获（R过程）元素的星际培养基的富集。我们使用半分析模型来描述银河的演化，并通过与最新人群合成模型一致的BNS合并的合并率和时间延迟分布。为了研究R过程元素和铁的相对丰度的分散，我们采用了湍流混合方案，在该方案中，新鲜合成的元素逐渐分散在星际介质中。我们表明，在我们的模型中，BNS合并可以完全解释在乳白色恒星中观察到的丰度，尤其是在低金属度处的散射。我们的结果表明，二进制中子恒星合并可能是银河系中R过程的主要来源。
We study the enrichment of the interstellar medium with rapid neutron capture (r-process) elements produced in binary neutron star (BNS) mergers. We use a semi-analytic model to describe galactic evolution, with merger rates and time delay distributions of BNS mergers consistent with the latest population synthesis models. In order to study the dispersion of the relative abundances of r-process elements and iron, we applied a turbulent mixing scheme, where the freshly synthesized elements are gradually dispersed in the interstellar medium. We show that within our model the abundances observed in Milky-Way stars, in particular the scatter at low metallicities, can be entirely explained by BNS mergers. Our results suggest that binary neutron star mergers could be the dominant source of r-process elements in the Galaxy.
