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arXiv 1601.02839astro-ph.GA
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银河系膨胀的3D结构

The 3D structure of the Galactic bulge

M. Zoccali, E. Valenti

摘要:

本文综述了有关银河系核球三维结构的观测证据。虽然我们银河系内部的几千秒差距通常被称为{ \it the bulge},但所有的观测都表明,这个区域由一个条形主导,即,凸起是条。该条在其外部区域具有方形/花生状(X形)结构,而在其最内部区域似乎变得越来越不细长。一个更薄和更长的结构也被发现了,虽然支持两个独立结构的观测证据最近受到了挑战。贫金属星([Fe/H] $\lesssim -0.5$ dex)的结构不同,运动学也不同。

英文摘要:

We review the observational evidences concerning the three-dimensional structure of the Galactic bulge. Although the inner few kpc of our Galaxy are normally referred to as {\it the bulge}, all the observations demonstrate that this region is dominated by a bar, i.e., the bulge is a bar. The bar has a boxy/peanut (X\--shaped) structure in its outer regions, while it seems to become less and less elongated in its innermost region. A thinner and longer structure departing from the main bar has also been found, although the observational evidences that support the scenario of two separate structures has been recently challenged. Metal poor stars ([Fe/H]$\lesssim -0.5$ dex) trace a different structure, and also have different kinematics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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