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arXiv 1702.02539astro-ph.GA
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利用Mira变星观测Milky Way膨胀区X形结构的缺失

Absence of an X-shaped Structure in the Milky Way Bulge Using Mira Variable Stars

Martin Lopez-Corredoira

摘要:

利用球核的示踪剂分析了球核的恒星密度分布。我们使用Catchpole等人(2016)调查和OGLE-III调查中的富氧Miras变量作为标准蜡烛。这些恒星的平均年龄约为9 Gyr。Mira变量追踪的总体符合方形凸起预测,而不是X形预测,因为沿着分析的视线只有一个密度峰值,而X形预测给出了两个明显的峰值。

英文摘要:

The stellar density distribution of the bulge is analyzed through one of its tracers. We use oxygen-rich Miras variables from the Catchpole et al. (2016) survey and OGLE-III survey as standard candles. The average age of these stars is around 9 Gyr. The population traced by Mira variables matches a boxy bulge prediction, not an X-shaped one, because only one peak is observed in the density along the analyzed lines of sight, whereas the prediction of an X-shape gives two clear peaks.

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