论文标题
NGC 6822中的气体动力学和恒星形成
Gas dynamics and star formation in NGC 6822
论文作者
论文摘要
我们提出了NGC 6822的气体运动学和恒星形成活动，这是一个位于本地组的矮星系，距离约490 kpc。我们执行H I Data Cube（42.4“ x 12.0”空间，对应于〜100 pc; 1.6 km S $^{ - 1} $频谱）的视线速度曲线的轮廓分解。为此，我们使用了一种基于贝叶斯分析技术的所谓的Baygaud，使我们能够以定量的方式将视线速度曲线分解为最佳数量的高斯组件。我们将NGC 6822的分解H I气体成分分类为凉爽，温暖的，凉爽的，凉爽的粉丝和温暖的非粉状运动，相对于其质心速度和速度分散体。我们将它们的气体表面密度与使用Galex Far-ultraviolet和Wise 22 $μ$ M数据得出的相应星形形成率密度相关联，以检查NGC 6822的NGC 6822的已解决的Kennicutt-Schmidt（K-S）定律。 （h $ _2 $）在低气表面密度下，我没有饱和。
We present H I gas kinematics and star formation activities of NGC 6822, a dwarf galaxy located in the Local Group at a distance of ~ 490 kpc. We perform profile decomposition of line-of-sight velocity profiles of the H I data cube (42.4" x 12.0" spatial, corresponding to ~ 100 pc; 1.6 km s$^{-1}$ spectral) taken with the Australia Telescope Compact Array (ATCA). For this, we use a new tool, the so-called BAYGAUD which is based on Bayesian analysis techniques, allowing us to decompose a line-of-sight velocity profile into an optimal number of Gaussian components in a quantitative manner. We classify the decomposed H I gas components of NGC 6822 into cool-bulk, warm-bulk, cool-non-bulk and warm-non-bulk motions with respect to their centroid velocities and velocity dispersions. We correlate their gas surface densities with corresponding star formation rate densities derived using both the GALEX far-ultraviolet and WISE 22 $μ$m data to examine the resolved Kennicutt-Schmidt (K-S) law for NGC 6822. Of the decomposed H I gas components, the cool-bulk component is likely to better follow the linear extension of the K-S law for molecular hydrogen (H$_2$) at low gas surface densities where H I is not saturated.
