论文标题
在mira变量中看到的银河系/花生隆起的年龄依赖性
Age-morphology dependence of the Milky Way boxy/peanut bulge seen in Mira variables
论文作者
论文摘要
我们分析了mira变量恒星在银河系中心区域的分布。我们发现，随着时期的增加，即年龄降低，MIRAS转向负银河纵向$ \ ell $。与对禁止的星系的宇宙变焦模拟相比，我们发现随着年龄的变化可以通过四形花生/凸起的年龄依赖性来解释。由于投影效应的结合和银河纵向范围的限制，$ \ ell> 0 $的近驼峰对年轻人群的截断更加截断，而在$ \ ell <0 $上的hump hump则占据了观察到的分布。
We analyse the distribution of Mira variable stars in the central region of the Milky Way. We find that with increasing period, i.e. decreasing age, the Miras shift towards negative Galactic longitudes $\ell$. Comparing to a cosmological zoom simulation of a barred galaxy, we find that this shift with age can be explained by an age-morphology dependence of the boxy peanut/bulge. Owing to a combination of projection effects and the limitation of the range of Galactic longitudes, the near hump at $\ell>0$ is more truncated for younger populations, and the far hump at $\ell<0$ dominates the observed distributions.
