论文标题
银河系用Gaia EDR3和Rave Dr5薄而厚的磁盘运动学
Milky Way thin and thick disk kinematics with GAIA EDR3 and RAVE DR5
论文作者
论文摘要
我们使用GAIA DR3目录进行了对太阳能域中银河系磁盘的运动学的详细分析。为了确定银河系恒星磁盘的局部运动学，我们使用了分布在圆柱体中的278,228个红色巨型分支（RGB）恒星的完整样品，以1 kpc半径为中心，半径为0.5 kpc。我们在每个银河半球中分别确定RGB恒星的运动学特性，以寻找可能的不对称性。 RGB恒星的运动特性揭示了两个运动学上不同的组件的存在：平均速度$ {v_r}的薄盘，{v_2}，{v_z} $ ok of -1，-239， -239，0 km s $ s $ s $ s $^{ - 1} $ and velocity $ nthe 31} $ = _ 11 km s $^{ - 1} $，以及厚度的厚磁盘，平均速度组件约为+1，-225、0 km s $^{ - 1} $，速度分散剂为49、35和22 km S $^{ - 1} $。我们发现，在银河平面上方/下方高度高达500 pc的高度，厚的磁盘恒星约占磁盘的一半。如此大量的RGB恒星具有厚磁盘运动学的厚度，这是银河系厚的厚磁盘的世俗进化场景起源。
We present a detailed analysis of kinematics of the Milky Way disk in solar neighborhood using GAIA DR3 catalog. To determine the local kinematics of the stellar disks of the Milky Way galaxy we use a complete sample of 278,228 red giant branch (RGB) stars distributed in a cylinder, centered at the Sun with a 1 kpc radius and half-height of 0.5 kpc. We determine separately the kinematical properties of RGB stars for each Galactic hemisphere in search for possible asymmetries. The kinematical properties of the RGB stars reveal the existence of two kinematically distinct components: the thin disk with mean velocities ${V_R}, {V_ϕ}, {V_Z}$ of about -1, -239, 0 km s$^{-1}$ correspondingly and velocity dispersions $σ_R, σ_ϕ, σ_Z$ of 31, 20 and 11 km s$^{-1}$, and the Thick disk with mean velocities components of about +1, -225, 0 km s$^{-1}$, and velocity dispersions of 49, 35, and 22 km s$^{-1}$. We find that up to 500 pc height above/below the galactic plane, Thick disk stars comprise about half the stars of the disk. Such high amount of RGB stars with Thick disk kinematics points at the secular evolution scenario origin for the Thick disk of the Milky Way galaxy.
