论文标题
拱门和五峰簇的绝对正确运动
The absolute proper motions of the Arches and Quintuplet clusters
论文作者
论文摘要
拱门和五五联体是两个年轻的大型集群，分别在银河中心附近。迄今为止，专注于理解其起源的研究是基于簇参考帧中得出的适当动作（PMS），并且需要对其3D运动的一些假设。在本文中，我们将这些簇的公共PM目录与GAIA DR2目录相结合，并首次将拱门和Quintuplet簇的相对PM转换为绝对参考系统。我们发现，拱门的绝对PM为$（μ_α\cosδ，μ_δ）$ $ = $ = $ = $（-1.45 \ \ pm \ pm \ 0.23，-2.68 \ \ pm \ pm \ 0.14）$ yr $^{ - 1} $ \ pm \ 0.09，-2.66 \ \ pm \ 0.18）$ mas yr $^{ - 1} $。这些值表明这些系统几乎平行于银河平面。仍然需要对簇的距离进行测量，以有意义地约束簇的轨道，并阐明拱门和五分子的起源。
Arches and Quintuplet are two young, massive clusters projected near the Galactic Center. To date, studies focused on understanding their origin have been based on proper motions (PMs) derived in the clusters' reference frames and required some assumptions about their 3D motion. In this paper, we combine public PM catalogs of these clusters with the Gaia DR2 catalog and, for the first time, transform the relative PMs of the Arches and Quintuplet clusters onto an absolute reference system. We find that the absolute PM of the Arches is $(μ_α\cosδ,μ_δ)$ $=$ $(-1.45\ \pm\ 0.23,-2.68\ \pm\ 0.14)$ mas yr$^{-1}$, and that of the Quintuplet is $(μ_α\cosδ,μ_δ)$ $=$ $(-1.19\ \pm\ 0.09,-2.66\ \pm \ 0.18)$ mas yr$^{-1}$. These values suggest that these systems are moving almost parallel to the Galactic plane. A measurement of the clusters' distances is still required to meaningfully constrain the clusters' orbits and shed light on the origin of the Arches and Quintuplet.
