论文标题
银河系的逆向工程
Reverse engineering the Milky Way
论文作者
论文摘要
由于破坏的卫星而产生的银色簇（GC）运动（GCS）的年龄，金属元素，α元素和积分，随着时间的流逝，卫星中断的年龄，α元素和积分。在这里，我们将这些保守的特性组合使用，将76个GC分配给5个祖细胞卫星星系 - 我们将其配音为Koala矮人星系。我们将泄漏的盒化学富集模型拟合到GC的年龄分布，从而得出每个卫星的有效收率和地层时代。根据GC计数的缩放关系，我们估计每个卫星的原始光环质量，恒星质量和平均金属性。 5个积聚卫星的恒星总质量贡献了大约10 $^{9} $ m $ _ {\ odot} $ in Start in Start in Stars in Stars in Stars of Mirky Way的增长，但超过了银河系GC系统的50 \％。这5颗卫星在很早的时期形成，很可能是在8--11 Gyr中积聚的，这表明银河系早期进化的快速增长。我们建议至少有3颗卫星是成核的，现在用残余核是银河系的GC。十一GC也被确定为已形成的距离，但不能分配给单个祖细胞卫星。
The ages, metallicities, alpha-elements and integrals of motion of globular clusters (GCs) accreted by the Milky Way from disrupted satellites remain largely unchanged over time. Here we have used these conserved properties in combination to assign 76 GCs to 5 progenitor satellite galaxies -- one of which we dub the Koala dwarf galaxy. We fit a leaky-box chemical enrichment model to the age-metallicity distribution of GCs, deriving the effective yield and the formation epoch of each satellite. Based on scaling relations of GC counts we estimate the original halo mass, stellar mass and mean metallicity of each satellite. The total stellar mass of the 5 accreted satellites contributed around 10$^{9}$ M$_{\odot}$ in stars to the growth of the Milky Way but over 50\% of the Milky Way's GC system. The 5 satellites formed at very early times and were likely accreted 8--11 Gyr ago, indicating rapid growth for the Milky Way in its early evolution. We suggest that at least 3 satellites were originally nucleated, with the remnant nucleus now a GC of the Milky Way. Eleven GCs are also identified as having formed ex-situ but could not be assigned to a single progenitor satellite.
