The Lowest Metallicity Stars in the LMC: Clues from MaGICC Simulations

The Lowest Metallicity Stars in the LMC: Clues from MaGICC Simulations
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LMC 中金属丰度最低的恒星:MaGICC 模拟的线索

DOI:
10.1017/pasa.2013.20
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发表时间:
2013
影响因子:
6.3
通讯作者:
Brook C
Brook C
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Brook C

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使用宇宙学流体动力学模拟的一个星系的类似质量的大麦哲伦云(LMC),我们研究其最低金属丰度人口的预测特征。特别是,我们强调的空间分布的第一代(流行III)和第二代(污染的只有直接流行III的祖先)的恒星。我们发现,原始组成的恒星不仅形成在中央星系的祖先,但也在局部坍塌的subhaloes在星系形成的早期阶段。这些次晕中金属丰度最低的恒星最终在宿主周围相对延伸的分布中,这些吸积恒星拥有今天的银河系中心距离约为40 kpc。相比之下,在整个模拟过程中,中央星系内形成的最早的恒星仍然在内部区域,那里是绝大多数星星形成的地方。因此,来自最早一代的恒星的比例随着半径的增加而强烈增加。
Using a cosmological hydrodynamical simulation of a galaxy of similar mass to the Large Magellanic Cloud (LMC), we examine the predicted characteristics of its lowest metallicity populations. In particular, we emphasise the spatial distributions of first (Pop III) and second (polluted by only immediate Pop III ancestors) generation stars. We find that primordial composition stars form not only in the central galaxy’s progenitor, but also in locally collapsed subhaloes during the early phases of galaxy formation. The lowest metallicity stars in these subhaloes end up in a relatively extended distribution around the host, with these accreted stars possessing present-day galactocentric distances as great as ~40 kpc. By contrast, the earliest stars formed within the central galaxy remain in the inner region, where the vast majority of star formation occurs, for the entirety of the simulation. Consequently, the fraction of stars that are from the earliest generation increases strongly with radius.
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