言語種別 英語 発行・発表の年月 2022/08 形態種別 学術雑誌 査読 査読あり 標題 ALMA astrometry of the objects within 0.5 pc of Sagittarius A*   ALMA astrometry of the objects within 0.5 pc of Sagittarius A* 執筆形態 共著 掲載誌名 Publications of the Astronomical Society of Japan 掲載区分 国外 出版社・発行元 Oxford　Academic 巻・号・頁 74(4),pp.738-766 著者・共著者 ◎ Masato Tsuboi, Takahiro Tsutsumi, Atsushi Miyazaki, Ryosuke Miyawaki, Makoto Miyoshi   ◎ Masato Tsuboi, Takahiro Tsutsumi, Atsushi Miyazaki, Ryosuke Miyawaki, Makoto Miyoshi 概要 The Atacama Large Millimeter/Submillimeter Array (ALMA) is promising to be a powerful tool for precision astrometry of the area around Sagittarius A* (Sgr A*) because it has a high angular resolution, high sensitivity, and wide field of view. We have observed the area including the Nuclear Star Cluster at 230 GHz with ALMA in 2017 October. The angular resolution is ∼0′′.03⁠. We determined the relative positions to Sgr A* of 65 compact objects in the area with an accuracy of ∼0′′.001⁠. We also analyzed the similar ALMA archival data obtained in 2019 June and determined the 64 relative positions in these objects. We derived the proper motions relative to Sgr A* by comparing these positions. The derived proper motions are roughly described with both clockwise and counterclockwise rotations around Sgr A*. The rotation velocities are reproduced by Kepler orbits bounded around Sgr A*. researchmap用URL https://academic.oup.com/pasj/advance-article/doi/10.1093/pasj/psac031/6596345?searchresult=1