论文标题
从阿斯科（Apogee）的证据表明，埋在银河系中的光环的主要构件
Evidence from APOGEE for the presence of a major building block of the halo buried in the inner Galaxy
论文作者
论文摘要
我们报告了Apogee的证据表明，在银河中心的$ \ sim $ 4〜kpc内存在新的金属贫困恒星结构。这种新的银河系结构（IGS）的特征是类似于银河系低质量卫星的化学成分，似乎在化学上和动态地与内星系中富含金属富含金属的人群分离。我们猜测，这种结构与可能发生在银河系早期生命的增生事件有关。将这种结构的平均元素丰度与宇宙数值模拟的预测进行比较，我们估计祖细胞系统的出色质量为$ \ sim5 \ times10^8m_ \ odot $，或最近发现的Gaia-enceladus/Sausage/Sausage系统的质量约为两倍。我们发现积聚的：{\ IT原位}比在我们的金属贫困中（[Fe/h] $ <$ - 0.8）的凸起样品在1：3和1：2之间，确认了各组的宇宙数值模拟预测。
We report evidence from APOGEE for the presence of a new metal-poor stellar structure located within $\sim$4~kpc of the Galactic centre. Characterised by a chemical composition resembling those of low mass satellites of the Milky Way, this new inner Galaxy structure (IGS) seems to be chemically and dynamically detached from more metal-rich populations in the inner Galaxy. We conjecture that this structure is associated with an accretion event that likely occurred in the early life of the Milky Way. Comparing the mean elemental abundances of this structure with predictions from cosmological numerical simulations, we estimate that the progenitor system had a stellar mass of $\sim5\times10^8M_\odot$, or approximately twice the mass of the recently discovered Gaia-Enceladus/Sausage system. We find that the accreted:{\it in situ} ratio within our metal-poor ([Fe/H]$<$--0.8) bulge sample is somewhere between 1:3 and 1:2, confirming predictions of cosmological numerical simulations by various groups.
