Demographics of the inner Milky Way

IF 14.3 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Nature Astronomy Pub Date : 2025-04-14 DOI:10.1038/s41550-025-02544-4

Bokyoung Kim

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银河系内部的人口统计

由于高星际湮灭带来的观测挑战，银河系中央的恒星人口结构仍然有些不清楚。为了提供这一地区的全面情况，Danny Horta Darrington、Michael Petersen和Jorge Peñarrubia对富含金属的红巨星进行了人口研究([Fe/H] >；-0.8)内星系(r <；5kpc)从远地点和盖亚DR3。他们确定了三个在空间上共存的群体：内盘恒星、星系棒和一个球体“结”，这表明内星系和银河系棒之间存在着密切的联系。虽然这些种群在动态分布上有统计学差异，但它们具有相似的化学成分和年龄特征，这表明它们具有共同的恒星形成历史。这个“结”由球状分布的老恒星组成，与经典凸起的大多数特征相似，除了它的金属丰度范围从-0.8到超级太阳。作者认为，这种差异可能源于“结”的不同形成途径：长期进化。这就是形成银河系的机制；这与主要的合并路径相反，后者被假设会产生一个经典的膨胀。

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Nature Astronomy Physics and Astronomy-Astronomy and Astrophysics

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2.80%

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252

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