论文标题
贝叶斯的方法，用于银河系磁盘的垂直结构
A Bayesian Approach to the Vertical Structure of the Disk of the Milky Way
论文作者
论文摘要
这项工作研究了银河系磁盘的恒星垂直轮廓。研究的模型是$ sech^{2/n}（nz/（2h））$的形式，在其中设置$α= 2/n $，序列$α= 0,1,2 $的三个函数对应于指数，$ sech $，$ sech $ sech^2 $函数。我们考虑了平面上方和下方的对称模型和不对称模型。该研究使用了Ferguson等人的大量K和M星样品。 （2017）并应用了贝叶斯模型比较的方法来区分这6个模型。 Ferguson等人的两个不一致之处。 （2017年），有关垂直高度切割和整个平面上的模型连续性的信息。我们发现（1）在银河系中，对称盘模型被果断排除，北部薄圆盘尺度高度$ \ sim25 \％$比南部大，（2）有适度的证据证明了指数级的$ sech $模型，而不是$ sech^2 $，尽管将样本延伸到了延伸到银色的中型中，因此需要延伸到pontem flane（3），以增强该图的范围（3）。低估了Gaia距离大约1.16，并且（4）Ferguson等人观察到的银河纬度的尺度高度的增加。是由于数据削减不正确。
This work investigates the vertical profile of the stars in the disk of the Milky Way. The models investigated are of the form $sech^{2/n}(nz/(2H))$ where, setting $α= 2/n$, the three functions of the sequence $α= 0,1,2$ correspond to exponential, $sech$, $sech^2$ functions. We consider symmetric models and asymmetric models, above and below the plane. The study uses the large sample of K and M stars of Ferguson et al. (2017) and applies the methods of Bayesian model comparison to discriminate between the 6 models. Two inconsistencies in Ferguson et al. (2017), concerning the vertical height cut and the model continuity across the plane, are noted and addressed. We find that (1) in the Milky Way the symmetric disc models are decisively ruled out, with northern thin disc scale heights $\sim25\%$ larger than southern, (2) there is moderate evidence for the exponential and $sech$ models over the $sech^2$ model, though a sample extending further into the Galactic mid-plane is needed to strengthen this result, (3) the photometric distances used by Ferguson et al. underestimate the GAIA distances by a factor of roughly 1.16, and (4) the increase of scale height with Galactic latitude observed by Ferguson et al. is due to incorrect cuts to the data.
