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arXiv 1904.09129astro-ph.GA
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根据CN测量我们银河系隆起的结构

Structure of our Galactic Bulge from CN Measurements

Jae-Woo Lee

摘要:

双红色团块(DRC)现在被认为是所谓的X形银河棒结构的强有力的观测证据。最近,Lee等人报道了DRC之间的细微平均\ds \差异,并提出了一种可以在球状星团中看到的二分法图像:暗淡的红色团块是第一代,而明亮的红色团块对应于第二代(SG)。他们认为,两个DRC之间的星等差异是由于不同的恒星星族,而不是由于DRC之间的几何差异。我们的重新分析表明,他们的数据似乎并不支持在我们的银河系隆起的多人口诱导的DRC的想法。我们进行充分的经验蒙特卡罗模拟,发现\ds \分布的形状是最严格的证据追求。我们的结果强烈地表明,CN向银河系核球的分布与X形核球的分布是定性一致的,SG的一小部分约为2 - 3%。

英文摘要:

The double red clumps (DRCs) are now dominantly believed to be the strong observational line of evidence of the so-called X-shaped Galactic bar structures. Recently, Lee et al. reported a subtle mean \ds\ difference between the DRCs and suggested a dichotomic picture that can be seen in globular clusters: the faint red clump is the first generation, while the bright red clump corresponds to the second generation (SG). They argued that the magnitude difference between the DRCs is due to different stellar populations, and is not due to the geometric difference between the DRCs. Our reanalysis shows that their data do not appear to support the idea of the multiple population-induced DRCs in our Galactic bulge. We perform fully empirical Monte Carlo simulations and find that the shape of the \ds\ distributions is the most stringent evidence to pursue. Our results strongly suggest that the CN distributions toward the Galactic bulge are qualitatively consistent with the X-shaped Galactic bulge with a minor fraction of the SG of about 2 -- 3\%.

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