Y
Y. K. Choi
Researcher at Korea Astronomy and Space Science Institute
Publications - 35
Citations - 4765
Y. K. Choi is an academic researcher from Korea Astronomy and Space Science Institute. The author has contributed to research in topics: Milky Way & Galactic Center. The author has an hindex of 15, co-authored 28 publications receiving 4463 citations. Previous affiliations of Y. K. Choi include Max Planck Society.
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Journal ArticleDOI
Trigonometric parallaxes of high mass star forming regions: the structure and kinematics of the milky way
Mark J. Reid,Karl M. Menten,Andreas Brunthaler,Xingwu Zheng,Thomas M. Dame,Ye Xu,Yuefang Wu,B. Zhang,Alberto Sanna,Mayumi Sato,Kazuya Hachisuka,Y. K. Choi,K. Immer,L. Moscadelli,K. L. J. Rygl,A. Bartkiewicz +15 more
TL;DR: In this paper, the authors estimate the radius to the Galactic center, R-0, to be 8.34 +/- 0.16 kpc, a circular rotation speed at the Sun, Theta(0), to be 240 +/- 8 km s(-1), and a rotation curve that is nearly flat.
Journal ArticleDOI
Trigonometric parallaxes of massive star-forming regions. vi. galactic structure, fundamental parameters, and noncircular motions
Mark J. Reid,Karl M. Menten,X. W. Zheng,Andreas Brunthaler,Luca Moscadelli,Y. Xu,Y. Xu,Bing Zhang,M. Sato,Mareki Honma,Tomoya Hirota,K. Hachisuka,Y. K. Choi,G. A. Moellenbrock,Anna Bartkiewicz +14 more
TL;DR: In this article, the authors used the Very Long Baseline Array and the Japanese VLBI Exploration of Radio Astronomy project to measure trigonometric parallaxes and proper motions of masers found in high-mass star-forming regions across the Milky Way.
Journal ArticleDOI
Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions
M. J. Reid,Karl M. Menten,Xingwu Zheng,Andreas Brunthaler,L. Moscadelli,Y. Xu,Bo Zhang,Mayumi Sato,Mareki Honma,Tomoya Hirota,K. Hachisuka,Y. K. Choi,G. A. Moellenbrock,Anna Bartkiewicz +13 more
TL;DR: In this paper, the authors used the VLBA and the Japanese VERA project to measure trigonometric parallaxes and proper motions of masers found in high-mass star-forming regions across the Milky Way.
Journal ArticleDOI
Fundamental Parameters of the Milky Way Galaxy Based on VLBI Astrometry
Mareki Honma,Takumi Nagayama,Kazuma Ando,Takeshi Bushimata,Y. K. Choi,Toshihiro Handa,Tomoya Hirota,Hiroshi Imai,Takaaki Jike,Mi Kyoung Kim,Osamu Kameya,Noriyuki Kawaguchi,Hideyuki Kobayashi,Hideyuki Kobayashi,Tomoharu Kurayama,Tomoharu Kurayama,Seisuke Kuji,Naoko Matsumoto,Seiji Manabe,Takeshi Miyaji,Kazuhito Motogi,Akiharu Nakagawa,Hiroyuki Nakanishi,Kotaro Niinuma,Chung Sik Oh,Toshihiro Omodaka,Tomoaki Oyama,Nobuyuki Sakai,Katsuhisa Sato,Mayumi Sato,Katsunori M. Shibata,Satoshi Shiozaki,Kazuyoshi Sunada,Yoshiaki Tamura,Yuji Ueno,Aya Yamauchi +35 more
TL;DR: In this article, the fundamental parameters of the Galaxy were determined based on VLBI astrometry of 52 Galactic maser sources obtained with VERA, VLBA, and EVN.
Journal ArticleDOI
The Bar and Spiral Structure Legacy (BeSSeL) survey: Mapping the Milky Way with VLBI astrometry†
Andreas Brunthaler,Mark J. Reid,K. M. Menten,Xingwu Zheng,Anna Bartkiewicz,Y. K. Choi,Thomas M. Dame,K. Hachisuka,K. Immer,K. Immer,G. A. Moellenbrock,Luca Moscadelli,K. L. J. Rygl,K. L. J. Rygl,Alberto Sanna,Mayumi Sato,Yuanwei Wu,Ye Xu,B. Zhang +18 more
TL;DR: In this article, the authors present an update on the first results, implementing a recent change in the knowledge about the Solar motion, and give an outlook to future observations in the Bar and Spiral Structure Legacy (BeSSeL) survey.