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Unifying the planar bar and the boxy bulge of the Milky Way

机译:统一银河系的单杠和方形凸起

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摘要

For some time the Milky Way has been understood as a barred disk galaxy. Star count observations have provided evidence for two bars at apparently different orientations, the boxy bulge and a long planar bar. We report recent work in which we argued for a scenario where these observations can be reproduced with a single boxy bulge/bar: an evolved bar from the stellar disk and the corresponding boxy bulge generated from it through secular evolution and buckling instability. We calculated the star count distributions along different lines-of-sight for a simulated barred galaxy and an observer at the Sun position, and compared them with observations of red clump magnitude distributions. We found a good agreement between the model and the observations, even though the simulation has a single boxy bulge/bar. In this model, the different apparent orientations of the boxy bulge and planar bar are partially due to the volume effect and partially to the leading ends of the bar.
机译:一段时间以来,银河一直被认为是禁止盘状星系。恒星计数的观测结果提供了两个方向明显不同的条形,方型凸起和长条形的证据。我们报告了最近的工作,在该工作中,我们提出了可以通过单个方型凸起/条再现这些观察结果的方案:从恒星盘演化而来的条,以及通过长期演化和屈曲不稳定性从中产生的相应方型凸起。我们计算了一个模拟的禁止星系和一个太阳位置的观察者沿着不同视线的恒星数分布,并将它们与红色团块大小分布的观测结果进行了比较。即使模拟只有一个方形的凸起/条,我们仍在模型和观测值之间找到了很好的一致性。在此模型中,方形凸起和平面杆的不同视在方向部分是由于体积效应,部分是由于杆的前端。

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