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首页> 外文期刊>The Astrophysical journal >TWO DISTINCT ANCIENT COMPONENTS IN THE SCULPTOR DWARF SPHEROIDAL GALAXY: FIRST RESULTS FROM THE DWARF ABUNDANCES AND RADIAL VELOCITIES TEAM
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TWO DISTINCT ANCIENT COMPONENTS IN THE SCULPTOR DWARF SPHEROIDAL GALAXY: FIRST RESULTS FROM THE DWARF ABUNDANCES AND RADIAL VELOCITIES TEAM

机译：简化的DWARF球面星系中的两个不同的古代成分：DWARF丰度和径向速度团队的第一个结果

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摘要

We have found evidence for the presence of two distinct ancient stellar components (both ≥10 Gyr old) in the Sculptor dwarf spheroidal galaxy. We used the ESO Wide Field Imager in conjunction with the Very Large Telescope/FLAMES spectrograph to study the properties of the resolved stellar population of Sculptor out to and beyond the tidal radius. We find that two components are discernible in the spatial distribution of horizontal branch stars in our imaging and in the [Fe/H] and υ_(hel) distributions for our large sample of spectroscopic measurements. They can be generally described as a "metal-poor" component ([Fe/H] < -1.7) and a "metal-rich" component ([Fe/H] > -1.7). The metal-poor stars are more spatially extended than the metal-rich stars, and they also appear to be kinematically distinct. These results provide insight into the formation processes of small systems in the early universe and the conditions found there. Even this simplest of galaxies appears to have had a surprisingly complex early evolution.
机译：我们发现有证据表明，在Sculptor矮球状星系中存在两个截然不同的古代恒星成分（都≥10 Gyr）。我们将ESO宽视场成像仪与甚大望远镜/ FLAMES光谱仪结合使用，研究了到达和超过潮汐半径的Sculptor分解恒星群体的特性。我们发现在我们的成像中水平分支星的空间分布以及我们的大量光谱测量样本的[Fe / H]和υ_（hel）分布中，可以辨别出两个分量。它们通常可以描述为“贫金属”成分（[Fe / H] <-1.7）和“富金属”成分（[Fe / H]> -1.7）。贫金属的恒星比富金属的恒星在空间上延伸更大，并且它们在运动学上也似乎是不同的。这些结果可洞悉早期宇宙中小系统的形成过程以及那里的条件。即使是最简单的星系，也似乎具有令人惊讶的复杂早期演化。

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