论文标题
来自银河凸起的分层组件的新的化石片段
A new class of fossil fragments from the hierarchical assembly of the Galactic bulge
论文作者
论文摘要
星系凸起的形成和进化过程尚不清楚，在银河系凸起中的年轻恒星的存在在很大程度上是有争议的。我们最近证明，在银河凸起的Terzan 5是一个复杂的恒星系统，其恒星托管具有非常不同的年龄且与田间种群相似的明显相似性的恒星。这表明其祖细胞可能是被认为通过合并会产生凸起的巨型结构之一。 Here we show that another globular cluster-like system in the bulge (Liller 1) hosts two distinct stellar populations with remarkably different ages: only 1-3 Gyr for the youngest, 12 Gyr for the oldest, which is impressively similar to the old component of Terzan 5. This discovery classifies Liller 1 and Terzan 5 as sites of recent star formation in the Galactic bulge and provides clear observational proof that the原始大规模结构的层次组装有助于形成银河系球体。
The formation and evolutionary processes of galaxy bulges are still unclear, and the presence of young stars in the bulge of the Milky Way is largely debated. We recently demonstrated that Terzan 5, in the Galactic bulge, is a complex stellar system hosting stars with very different ages and a striking chemical similarity to the field population. This indicates that its progenitor was likely one of the giant structures that are thought to generate bulges through coalescence. Here we show that another globular cluster-like system in the bulge (Liller 1) hosts two distinct stellar populations with remarkably different ages: only 1-3 Gyr for the youngest, 12 Gyr for the oldest, which is impressively similar to the old component of Terzan 5. This discovery classifies Liller 1 and Terzan 5 as sites of recent star formation in the Galactic bulge and provides clear observational proof that the hierarchical assembly of primordial massive structures contributed to the formation of the Milky Way spheroid.
