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

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

Observation of magnetic field strength of the molecular cloud core L1521E for the Zeeman effect of the CCS JN=43-32 emission lines.

新永浩子, 宮崎敦史, 大野剛志, 坪井昌人, 春日隆

日本天文学会年会講演予稿集, 1998 77, 1998
Flare of Sagittarius A* at millimeter wavelengths.

宮崎敦史, 堤貴弘, 坪井昌人

日本天文学会年会講演予稿集, 1998 120, 1998
The Plans of Japanese Lunar Astronomical Observatory.

竹内覚, 岩田隆浩, 唐牛宏, 磯部しゅう三, 坪井昌人, 岡朋治, 伊藤昇, 島田貞憲

宇宙科学技術連合講演会講演集, 41st 1419-1422, Oct, 1997
Suppression of wide angle radiation level of a radio telescope on the Moon by baffle

Miyahara Norio, SHIMAWAKI Yutaka, TSUBOI Masato, KAIFU Norio

Proceedings of the Society Conference of IEICE, 1997(1) 107-107, Aug 13, 1997
銀河団Abell 2218のSZ効果の観測

坪井昌人, 大野剛志, 宮崎敦史, 春日隆, 松尾宏, 久野成夫

日本天文学会年会講演予稿集, 1997 151, 1997
Dynamic condition of molecular cloud in the galactic center region. II.

宮崎敦史, 坪井昌人

日本天文学会年会講演予稿集, 1997 112, 1997
ミリ波帯電波カメラによるSZ効果観測計画 V

大野剛志, 坪井昌人, 宮崎敦史, 春日隆, 野口卓, 坂本彰弘

日本天文学会年会講演予稿集, 1997 169, 1997
銀河系中心核近傍で発見された高速特異分子雲

岡朋治, 長谷川哲夫, WHITE G J, 佐藤文男, 坪井昌人, 宮崎敦史

日本天文学会年会講演予稿集, 1997 90, 1997
SZ effect observation plan using a millimeter wave zone radio wave camera. IV.

坪井昌人, 宮崎敦史, 大野剛志, 春日隆, 野口卓, 坂本彰弘

日本天文学会年会講演予稿集, 1997 185, 1997
銀河中心領域における分子雲の力学的状態 III

宮崎敦史, 坪井昌人, 長谷川哲夫, 岡朋治, 佐藤文男

日本天文学会年会講演予稿集, 1997 86, 1997
Development of a millimeter wave zone reflection type polarimeter.

新永浩子, 坪井昌人, 春日隆

日本天文学会年会講演予稿集, 1997 182, 1997
野辺山45m望遠鏡用広帯域反射型偏波計の開発

新永浩子, 坪井昌人, 春日隆

日本天文学会年会講演予稿集, 1997 158, 1997
40-50GHz Array Receiver with Tunerless SIS Mixers

(55) 1-5, 1997
A Reflector-type Polarimeter for Millimeter-wave Band

(55) 6-8, 1997
Observation plan for space background radiation from the lunar surface.

坪井昌人

科学衛星・宇宙観測シンポジウム, 5th 157-160, Nov, 1996
Observation of cosmic background radiation from space.

坪井昌人

宇宙放射線シンポジウム, 1995 91-93, Mar, 1996
IRAS HCN(J=3-2) bright line survey of F10214+4724.

宮崎敦史, 坪井昌人, 中井直正

日本天文学会年会講演予稿集, 1996 124, 1996
Temperature distribution of molecular gas in the Galactic center.

岡朋治, 長谷川哲夫, 佐藤文男, 坪井昌人, 宮崎敦史, 山崎英人

日本天文学会年会講演予稿集, 1996 111, 1996
SZ effect observation plan by milli-wave band radio wave camera. II.

坪井昌人, 宮崎敦史, 春日隆, 野口卓, 坂本彰弘

日本天文学会年会講演予稿集, 1996 203, 1996
SZ effect observation plan using a millimeter wave radio camera. III.

坪井昌人, 宮崎敦史, 春日隆, 野口卓, 坂本彰弘

日本天文学会年会講演予稿集, 1996 205, 1996
Dynamic condition of a molecular cloud in the galactic center region.

宮崎敦史, 坪井昌人

日本天文学会年会講演予稿集, 1996 104, 1996
Evaluation of the circularly polarizing performance of a 40GHz band polarimeter for a 45m telescope.

新永浩子, 坪井昌人, 春日隆

日本天文学会年会講演予稿集, 1996 190, 1996
Molecular cloud interacting with galactic system center Radio Arc.

岡朋治, 長谷川哲夫, 佐藤文男, 坪井昌人, 半田利弘

日本天文学会年会講演予稿集, 1996 106, 1996
Highly polarized ²⁸SiO maser emission in J = 1-0, v = 0 from Orion-kl IRc2

M. Tsuboi, E. Ohta, T. Kasuga, Y. Murata, T. Handa

Astrophysical Journal, 461(2 PART II), 1996 Peer-reviewed
43GHz observations of galactic enter arc-polarized plumes 現 complex

T.Kasuga, M.Tsuboi

Proc. of East Asian Meeting on Astronomy, Sep, 1995

全131頁
The detection of the Orion SiO maser of v=30, J=1-0

M.Tsuboi

計測自動制御学会論文集第36巻第9号, Sep, 1995

3波長の距離にわたる遅延変調法を導入することにより、光干渉縞の追尾性能を大幅に向上した。 736～742頁
銀河中心電波アークと分子雲の相互作用

川端哲也, 田原博人, 坪井昌人

日本天文学会年会講演予稿集, 1995 147, 1995
ミリ波帯電波カメラによるSZ効果観測計画

坪井昌人, 宮崎敦史, 春日隆, 野口卓, 坂本彰弘

日本天文学会年会講演予稿集, 1995 193, 1995
星間現象銀河系中心電波アークの40GHz偏波観測

川端哲也, 坪井昌人, 春日隆, 村田泰宏, 半田利弘

日本天文学会年会講演予稿集, 1995 86, 1995
活動銀河核銀河系中心領域のCO広域マッピング III.

長谷川哲夫, 岡朋治, 半田利弘, 佐藤文男, 坪井昌人

日本天文学会年会講演予稿集, 1995 122, 1995
観測機器 40GHz帯マルチビーム受信機の開発 II SISミキサーテストセットの開発

宮崎敦史, 神野孝吏, 坪井昌人, 砂田和良, 坂本彰弘, 野口卓, 春日隆

日本天文学会年会講演予稿集, 1995 161, 1995
銀河銀河系中心領域CO mapping IV ¹³CO(J=1‐0)/¹²CO(J=1‐0) 輝線比からの示唆

岡朋治, 長谷川哲夫, 佐藤文男, 坪井昌人, 半田利弘

日本天文学会年会講演予稿集, 1995 106, 1995
Polarimeter at 40-50 GHz for the Nobeyama 45-m Radiotele- scope

M.Tsuboi

Proc. of Int. Conf. on infrared and millimeter waves, Oct, 1994

全2頁
観測機器・情報処理野辺山45m鏡用40GHz帯偏波計

坪井昌人, 川端哲也, 太田栄司, 春日隆, 畑山克也, 村田泰広, 加藤龍司, 半田利弘

日本天文学会年会講演予稿集, 1994 192, 1994
観測機器・情報処理 KNIFE用新ミリ波冷却受信機の開発

中島潤一, 岩田隆浩, 高橋幸雄, 宮地竹史, 川辺良平, 岩下浩幸, 浮田信治, 松本欣也, 坪井昌人

日本天文学会年会講演予稿集, 1994 199, 1994
Present state of ground observation of SNIJAEV ZELDVIC (SZ) effect and demand of observation from space. ( the Ministry of Education S ).

坪井昌人

1994年度VLBIシンポジウム, 129-133, 1994
銀河系中心領域の¹³CO広域マッピング II

長谷川哲夫, 佐藤文男, 岡朋治, 坪井昌人, 半田利弘

日本天文学会年会講演予稿集, 1994 95, 1994
Orion‐IRc2のSiOメーザーの偏波観測計画

太田栄治, 坪井昌人, 春日隆, 村田泰宏, 半田利弘

日本天文学会年会講演予稿集, 1994 87, 1994
Special issue : Evolving galaxy.Our galactic system center.

坪井昌人

科学, 63(2) 113-118, Feb, 1993
ミラ型変光星のSiOメーザー(J=1‐0)輝線のv=1/v=2の同時偏波観測

太田栄治, 坪井昌人, 春日隆, 村田泰宏, 半田利弘

日本天文学会年会講演予稿集, 1993 66, 1993
銀河系中心領域の¹³CO広域マッピング

長谷川哲夫, 佐藤文男, 岡朋治, 坪井昌人, 半田利弘

日本天文学会年会講演予稿集, 1993 57, 1993
銀河系中心CSJ=1‐0サーベイ

坪井昌人, 半田利弘, 浮田信治

日本天文学会年会講演予稿集, 1993 2, 1993
スニヤエフ‐ゼルドビッチ効果で宇宙を測ろう!

坪井昌人

パリティ, 7(11) 46-50, Nov, 1992
天体列伝 8 銀河系中心

坪井昌人

天文月報, 85(8) 372-373, Aug, 1992
銀河系中心(天体列伝-8-)

坪井昌人

天文月報, 85(8) p372-373, Aug, 1992
S‐520‐17号機サブミリ波望遠鏡の光学系. 2

奥村健市, 松尾宏, 春日隆, 稲谷順司, 坪井昌人, 宮沢敬輔, 久野成夫, 村上浩

日本天文学会年会講演予稿集, 1992 A084, 1992
ロケット搭載用0.3K冷凍器の開発

宮沢敬輔, 稲谷順司, 坪井昌人, 久野成夫, 奥村健市, 松尾宏, 春日隆, 村上浩

日本天文学会年会講演予稿集, 1992 A059, 1992
S―520―17号機によるサブミリ波観測計画

松尾宏, 稲谷順司, 宮沢敬輔, 坪井昌人, 久野成夫, 奥村健市, 春日隆, 村上浩

日本天文学会年会講演予稿集, 1992 215, 1992
100GHz帯25マルチビーム受信機システムの技術展望

稲谷順司, 野口卓, 浮田信治, 川口則幸, 坪井昌人, 中井直正, 坂本彰弘, 史生才, 砂田和良

日本天文学会年会講演予稿集, 1992 A088, 1992
VLBI OBSERVATIONS OF THE 2 SIO MASER LINES FROM MU CEPHEI

M MIYOSHI, M MORIMOTO, N KAWAGUCHI, N UKITA, M INOUE, K MIYAZAWA, M TSUBOI, T MIYAJI, H MIKOSHIBA, H TAKABA, T IWATA, Y KOYAMA, S HAMA, Y TAKAHASHI

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 44(6) L259-L262, 1992

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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