Masato TSUBOI

(坪井昌人)

Profile Information

Affiliation: Professor, School of Science and Engineering, Department of Interdisciplinary Science and Engineering, Meisei University
(Professor emeritus), Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency

Degree: PhD(Mar, 1988, The Univeristy of Tokyo)

J-GLOBAL ID: 201801015276314608
researchmap Member ID: B000301395

Radio astronomer

Research Interests

Research Areas

Natural sciences / Astronomy /

Research History

Apr, 2023 - Present

(professor emeritus), Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
Apr, 2023 - Present

professor, School of Science and Engineering Department of Interdisciplinary Science and Engineering, Meisei University
Apr, 2007 - Mar, 2023

Professor, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
Apr, 2005 - Mar, 2020

Professor, Graduate School of Science, The University of Tokyo
Apr, 2004 - Mar, 2007

Director, Nobeyama Radio Observatory, National Astronomical Observatory of Japan
Feb, 2004 - Mar, 2007

Professor, National Astronomical Observatory of Japan
Jul, 1993 - Jan, 2004

Associate Professor, Ibaraki University
Nov, 1989 - Jun, 1993

Assistant Professor, National Astronomical Observatory of Japan
Apr, 1988 - Oct, 1989

Researcher/Postdoc, Japan Society for the Promotion of Science

Education

Apr, 1985 - Mar, 1988

Astronomy, Graduate School of Science Doctoral Program, The University of Tokyo
Apr, 1983 - Mar, 1985

Astronomy, Graduate School of Science Master Program, The University of Tokyo
Apr, 1981 - Mar, 1983

Department of Astronomy, Faculty of Science, The University of Tokyo
Apr, 1977 - Mar, 1981

Department of Chemistry, Faculty of Science, The University of Tokyo

Papers

144

Nuclear stellar disk-like nature in the kinematics of SiO maser stars around Sagittarius A*

Masato Tsuboi, Takahiro Tsutsumi, Ryosuke Miyawaki, Makoto Miyoshi

Publications of the Astronomical Society of Japan, 77(4) 733-745, May 28, 2025 Peer-reviewedLead author
The Jet and Resolved Features of the Central Supermassive Black Hole of M87 Observed with EHT in 2017—Comparison with the GMVA 86 GHz Results

Makoto Miyoshi, Yoshiaki Kato, Junichiro Makino, Masato Tsuboi

The Astrophysical Journal Letters, 963 L18, Mar 1, 2024 Peer-reviewed
Ka-band cryogenic low-noise receiver of the Misasa 54 m antenna for deep-space communications and radio astronomy

Masato Tsuboi, Yutaka Hasegawa, Go Tabuchi, Yasuhiro Murata, Koji Yuchi, Tomoaki Toda, Takashi Uchimura, Kimihiro Kimura, Takashi Kasuga

Publications of the Astronomical Society of Japan, 75(3) 567-583, Apr 5, 2023 Peer-reviewedLead author
X3: A High-mass Young Stellar Object Close to the Supermassive Black Hole Sgr A*

Florian Peißker, Michal Zajaček, Nadeen B. Sabha, Masato Tsuboi, Jihane Moultaka, Lucas Labadie, Andreas Eckart, Vladimír Karas, Lukas Steiniger, Matthias Subroweit, Anjana Suresh, Maria Melamed, Yann Clénet

The Astrophysical Journal, 944(2) id.231, Feb 1, 2023 Peer-reviewed
ALMA astrometry of the objects within 0.5 pc of Sagittarius A*

Masato Tsuboi, Takahiro Tsutsumi, Atsushi Miyazaki, Ryosuke Miyawaki, Makoto Miyoshi

Publications of the Astronomical Society of Japan, 74(4) 738-756, May 31, 2022 Peer-reviewedLead author

Misc.

315

臼田64m鏡によるOH輝線観測のためのL帯受信機開発

深谷直史, 山本宏昭, 石川竜巳, 松月大和, 村田泰宏, 坪井昌人, 中西裕之, 今井裕, 蔵原昂平

日本天文学会年会講演予稿集, 2023, 2023
銀河系中心の特異な分子雲を繋ぐフィラメント構造の発見

坪井昌人, 宮脇亮介, 堤貴弘, 三好真

日本天文学会年会講演予稿集, 2023, 2023
臼田64m鏡によるOH輝線観測に向けた整備 2:進捗報告

山本宏昭, 深谷直史, 石川竜巳, 松月大和, 大野知希, 村田泰宏, 坪井昌人, 中西裕之, 今井裕, 蔵原昂平

日本天文学会年会講演予稿集, 2023, 2023
Bullet Stars Leave Long Tails in the Galactic Center

坪井昌人, 宮脇亮介, TSUTSUMI Takahiro, 三好真

Proceedings of the Spring Annual Meeting, the Astronomical Society of Japan, 2023, 2023 Lead author
Joint Analysis of Proper Motion and Radial Velocity of GCIRS13E; New Mass Estimation of the IMBH Candidate

TSUBOI Masato, TSUTSUMI Takahiro, MIYOSHI Makoto, MIYAWAKI Ryosuke, MIYAZAKI Atsushi

日本天文学会年会講演予稿集, 2022, Sep, 2022 Lead author

Books and Other Publications

電波天文学（第２版）

中井, 直正, 坪井, 昌人, 福井, 康雄

日本評論社, Jul, 2020 (ISBN: 9784535607668)
Galactic Center Workshop 2019 : new horizons in galactic center astronomy and beyond : proceedings of a Workshop held at Keio University, Yokohama, Japan, 21-24 October 2019

坪井, 昌人, 岡, 朋治

Astronomical Society of the Pacific, 2020 (ISBN: 9781583819432)
電波天文学

中井, 直正, 坪井, 昌人, 福井, 康雄

日本評論社, Aug, 2009 (ISBN: 9784535607361)
Approaching micro-arcsecond resolution with VSOP-2 : astrophysics and technology : proceedings of a workshop held at Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa, Japan, 03-07 December 2007

萩原, 喜昭, Fomalont, Edward, 坪井, 昌人, 村田, 泰宏

Astronomical Society of the Pacific, 2009 (ISBN: 9781583816790)
A high velocity molecular cloud near the center of the galaxy

理化学研究所, 岡, 朋治, 長谷川, 哲夫, 佐藤, 文男, 坪井, 昌人, 宮崎, 敦史

The Institute of Physical and Chemical Research, 1998

Teaching Experience

Topics in astrophysics (Chiba University)
Basic Experiment Course of Space Science (Ibaraki University)
Radioastronomy (Ibaraki University)
Space Science (Ibaraki University)
Introduction to Experimental Physics (Ibaraki University)

Professional Memberships

Research Projects

Search for IMBHs within the central 1 parsec of the Milky Way

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2019 - Mar, 2024
Origin of Nuclear Star Cluster of Milky Way

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2016 - Mar, 2019

TSUBOI Masato, KITAMURA yoshimi
A Method for Direct Measurement of BH Spacetime

Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2014 - Mar, 2017

Saida Hiromi, TAKAHASHI Masaaki, NAMBU Yasusada, TSUBOI Masato, MIYOSHI Makoto, KASUGA Takashi, OKA Tomoharu
Observation of Fluctuation of Cosminc Background Radiation

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Japan Society for the Promotion of Science, 2001 - 2003

TSUOI Masato, YOKOSAWA Masayoshi, KJASUGA Takashi
Observations of Sunyaev-Zel'dovich Effect

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, 1998 - 1999

TSUBOI Masato, YOKOSAWA Masayashi, MATSUO Hiroshi, KASUGA Takashi

Academic Activities

Publication of Astronomical Society of Japan, Associate Editor

Peer review

2012 - 2022

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