论文标题
使用开放式簇重新访问银河磁盘和螺旋臂
Revisiting Galactic disk and spiral arms using open clusters
论文作者
论文摘要
我们使用后高调时代最大的开放群集目录来提供银河磁盘的观察视图。通过编译年龄，距离和运动学信息等物理参数，我们研究了开放簇的空间分布，并重新审视银河系磁盘中的螺旋臂和其他不对称。我们使用年轻的开放式簇作为螺旋臂的示踪剂，绘制了银河系的螺旋结构，发现大多数簇开始以约10-20 Myr的螺旋臂迁移，并随着年龄的进步而填补了臂间的区域。使用371个开放星簇的3D运动学信息，我们遵循银河系旋转曲线的螺旋臂的不同单个模式速度，因此有利于银河系螺旋臂的短暂性。每个螺旋臂的图案旋转速度表明，在过去的80个MYR中，螺旋臂没有加速。基于在银河平面上方或下方700 Myr的开放簇的分布，我们发现了$ z_ \ odot = 17.0 \ pm0.9 $ pc的太阳偏移位于银河平面以北的PC，并估计了尺度高度$ z_h = 91.7 \ 91.7 \ pm 1.9 $ pp the Galactic PC。
We use the largest open clusters catalogue in the post-Gaia era to provide the observational view of the Galactic disk. By compiling the physical parameters like age, distance, and kinematic information, we investigate the spatial distribution of the open clusters and revisit the spiral arms and other asymmetries in the Galactic disk. Using the young open clusters as a tracer of spiral arms, we map the spiral structure of the Galaxy and found that most of the clusters start migrating away from the spiral arms in about 10-20 Myr and fill the inter-arm regions as their age progress. Using the 3D kinematic information of 371 open star clusters, we derived different individual pattern speeds for spiral arms closely following the Milky Way rotation curve, hence favouring the transient nature of Milky Way spiral arms. The pattern rotation speeds of each spiral arm suggest that the spiral arms have not accelerated in the last 80 Myrs. Based on the distribution of open clusters younger than 700 Myr above or below the Galactic plane, we found a Solar offset of $z_\odot = 17.0\pm0.9$ pc north of the Galactic plane and estimated the scale height $z_h = 91.7 \pm 1.9$ pc from the Galactic plane.
