论文标题
调查磁盘的垂直分布作为径向动作的函数
Investigating the vertical distribution of the disk as a function of radial action
论文作者
论文摘要
由于加热过程可以扩大径向作用和银河系盘的垂直分布的分布，因此我们研究了银河磁盘的垂直分布，这是基于Apache Point观测值银河系进化实验（Apogee）和Gaia数据的径向作用的函数，以深化我们对银河盘的形成和供热历史的理解。我们发现，可以通过伪等温度分布来近似描述薄磁盘的径向作用的分布，这给出了磁盘温度的统计测量，如星样品的平均径向作用所示。对这些伪用的磁盘分布的不同径向动作范围的尺度高度的估计似乎显示出径向动作$ J_R $与比例高度$ h $之间的固定关系。我们用$ h = \ sqrt {j_r /a} + b $的两参数函数描述了这些关系，其中$ a $和$ b $是免费参数。当使用$ h = \ sqrt [α] {j_r/a}+b $的三参数函数进行测试时，我们发现此两参数函数很好地描述了薄磁盘，但我们注意到该功能应用于厚磁盘的厚度。在比较薄磁盘和厚磁盘之间的内部和外部磁盘之间的最佳拟合关系时，我们发现薄磁盘的关系几乎相同，但对于较厚的磁盘而言是不同的。内部厚的磁盘显示出几乎扁平的关系，而外部厚磁盘逐渐增加了关系。这项工作突出了一种通过研究尺度高度和径向作用之间的关系来揭示磁盘加热历史的另一种方法，因为这些关系编码了银河系磁盘的形成和加热历史。
As heating processes can broaden the distributions of radial actions and the vertical distributions of the Galactic disks, we investigate the vertical distribution of the Galactic disks as a function of radial action based on Apache Point Observatory Galactic Evolution Experiment(APOGEE) and Gaia data in order to deepen our understanding of the formation and heating history of the Galactic disks. We find that the distributions of radial action for both the thin and thick disks can be approximately described by pseudo-isothermal distributions, which give a statistical measurement for the temperature of the disk as indicated by the mean radial action of the star sample. Estimations of the scale heights in different radial action ranges for these pseudo-isothermal distributions of the disks seem to show fixed relationships between radial action $J_R$ and scale height $h$. We describe these relationships with a two-parameter function of $h = \sqrt{J_R /a} + b$, where $a$ and $b$ are free parameters. When testing with a three-parameter function of $h=\sqrt[α]{J_R/a}+b$, we find that this two-parameter function describes the thin disk well, but we note the function should be used with care for the thick disk. When comparing the best-fit relationships between the inner and outer disk for both of the thin and thick disks, we find that the relationships are nearly the same for the thin disks but are different for the thick disks. The inner thick disk shows a nearly flattened relationship, while the outer thick disk presents a gradually increasing relationship. This work highlights an alternative way to unveil the heating history of the disks by investigating the relationship between scale height and radial action, as these relationships encode the formation and heating history of the Galactic disks.
