Ryuichi Fujimoto

(藤本龍一)

Profile Information

Affiliation: Professor, Department of Space Astronomy and Astrophysics, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
Professor, Space and Astronautical Science, Graduate Institute for Advanced Studies, The Graduate University for Advanced Studies
Visiting Professor, Department of Physics, School of Science, Institute of Science Tokyo

Degree: Ph. D.(Mar, 1993, The University of Tokyo)
Master's degree(Oct, 1996, The University of Tokyo)

Researcher number: 20280555
ORCID ID: https://orcid.org/0000-0002-2374-7073
J-GLOBAL ID: 200901095989600566
researchmap Member ID: 1000363020

I have been developing cryogenic high-resolution X-ray microcalorimeter spectrometers onboard X-ray astronomy satellite. It was achieved as the Resolve instrument onboard XRISM, which was launched in September, 2023. Now I am working for LiteBIRD, Lite spacecraft for the study of B-mode polarization and Inflation from cosmic background Radiation Detection.

Here are research themes I can provide. (1) Analyze high-resolution X-ray spectroscopy data obtained by XRISM satellite, and research motion of the hot gas in clusters of galaxies, in order to understand the formation of the large-scale structures of the Universe. (2) Conduct experimental studies, in anticipation of LiteBIRD mission, that aims for observing the polarization of the cosmic microwave background radiation.

Message to students: Through the research, develop an understanding of specific natural phenomena, and also learn the process to reach fundamental physics laws that underlie the complex phenomena, together with experimental and/or analytical methods.

Research Interests

Research Areas

Research History

Jun, 2023 - Present

professor, Department of Space Astronomy and Astrophysics, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
Apr, 2008 - May, 2023

associate professor, Faculty of Mathematics and Physics, Institute of Science and Engineering, Kanazawa University
Dec, 2006 - Mar, 2008

associate professor, Graduate School of Natural Science and Technology, Kanazawa University
Oct, 2003 - Nov, 2006

research associate, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
Apr, 1995 - Sep, 2003

research associate, Institute of Space and Astronautical Science

Education

Apr, 1991 - Mar, 1995

Department of Physics, Graduate School of Science, The University of Tokyo
Apr, 1987 - Mar, 1991

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

Committee Memberships

Apr, 2009 - Mar, 2011

Annual meeting venue director, Astronomical Society of Japan

Awards

2010

PASJ Excellent Paper Award 2009, Astronomical Society of Japan

Major Papers

198

Resolve instrument onboard the X-Ray Imaging and Spectroscopy Mission

Richard L. Kelley, Yoshitaka Ishisaki, Elisa Costantini, Hisamitsu Awaki, Jesus C. Balleza, Kim R. Barnstable, Thomas G. Bialas, Rozenn Boissay-Malaquin, Gregory V. Brown, Edgar R. Canavan, Timothy M. Carnahan, Meng P. Chiao, Brian J. Comber, Renata S. Cumbee, Jan-Willem den Herder, Johannes Dercksen, Cor P. de Vries, Michael J. DiPirro, Megan E. Eckart, Yuichiro Ezoe, Carlo Ferrigno, Ryuichi Fujimoto, Nathalie Gorter, Steven M. Graham, Martin Grim, Leslie S. Hartz, Ryota Hayakawa, Takayuki Hayashi, Natalie Hell, Yuto Ichinohe, Daiki Ishi, Manabu Ishida, Kumi Ishikawa, Bryan L. James, Yoshiaki Kanemaru, Steven J. Kenyon, Caroline A. Kilbourne, Mark O. Kimball, Shunji Kitamoto, Maurice A. Leutenegger, Yoshitomo Maeda, Dan McCammon, Brian J. McLaughlin, Joseph J. Miko, Erik van der Meer, Misaki Mizumoto, Hirofumi Noda, Takashi Okajima, Atsushi Okamoto, Stephane Paltani, Frederick S. Porter, Lillian S. Reichenthal, Kosuke Sato, Toshiki Sato, Yoichi Sato, Makoto Sawada, Keisuke Shinozaki, Russell Shipman, Peter J. Shirron, Gary A. Sneiderman, Yang Soong, Richard Szymkiewicz, Andrew E. Szymkowiak, Yoh Takei, Mai Takeo, Keisuke Tamura, Masahiro Tsujimoto, Yuusuke Uchida, Stephen Wasserzug, Michael C. Witthoeft, Rob Wolfs, Shinya Yamada, Noriko Y. Yamasaki, Susumu Yasuda

Journal of Astronomical Telescopes, Instruments, and Systems, 11(04), Nov 11, 2025 Peer-reviewed
Resolve instrument onboard XRISM: design, integration, and instrument test results

Yoshitaka Ishisaki, Richard L. Kelley, Hisamitsu Awaki, Jesus C. Balleza, Kim R. Barnstable, Thomas G. Bialas, Rozenn Boissay-Malaquin, Gregory V. Brown, Edgar R. Canavan, Renata S. Cumbee, Timothy M. Carnahan, Meng P. Chiao, Brian J. Comber, Elisa Costantini, Jan-Willem den Herder, Johannes Dercksen, Cor P. de Vries, Michael J. DiPirro, Megan E. Eckart, Yuichiro Ezoe, Carlo Ferrigno, Ryuichi Fujimoto, Nathalie Gorter, Steven M. Graham, Martin Grim, Leslie S. Hartz, Ryota Hayakawa, Takayuki Hayashi, Natalie Hell, Akio Hoshino, Yuto Ichinohe, Manabu Ishida, Kumi Ishikawa, Bryan L. James, Steven J. Kenyon, Caroline A. Kilbourne, Mark O. Kimball, Shunji Kitamoto, Maurice A. Leutenegger, Yoshitomo Maeda, Dan McCammon, Joseph J. Miko, Misaki Mizumoto, Hirofumi Noda, Takashi Okajima, Atsushi Okamoto, Stephane Paltani, Frederick S. Porter, Kosuke Sato, Toshiki Sato, Makoto Sawada, Keisuke Shinozaki, Russell Shipman, Peter J. Shirron, Gary A. Sneiderman, Yang Soong, Richard Szymkiewicz, Andrew E. Szymkowiak, Yoh Takei, Keisuke Tamura, Masahiro Tsujimoto, Yuusuke Uchida, Stephen Wasserzug, Michael C. Witthoeft, Rob Wolfs, Shinya Yamada, Susumu Yasuda

Journal of Astronomical Telescopes, Instruments, and Systems, 11(04), Aug 14, 2025 Peer-reviewedCorresponding author
Signatures of large-scale cold fronts in the optically-selected merging cluster HSC J085024+001536

Tanaka, K., Fujimoto, R., Okabe, N., Mitsuishi, I., Akamatsu, H., Ota, N., Oguri, M., Nishizawa, A.J.

Publications of the Astronomical Society of Japan, 73(3) 584-595, Jun, 2021 Peer-reviewed
X-ray study of the double source plane gravitational lens system Eye of Horus observed with XMM-Newton

Tanaka, K., Tsuji, A., Akamatsu, H., Chan, J.H.H., Coupon, J., Egami, E., Finet, F., Fujimoto, R., Ichinohe, Y., Jaelani, A.T., Lee, C.-H., Mitsuishi, I., More, A., More, S., Oguri, M., Okabe, N., Ota, N., Rusu, C.E., Sonnenfeld, A., Tanaka, M., Ueda, S., Wong, K.C.

Monthly Notices of the Royal Astronomical Society, 491(3) 3411-3418, 2020 Peer-reviewed

Misc.

178

Development of superconducting transition-edge X-ray microcalorimetors for use in orbit I

MIYAZAKI Toshiyuki, MITSUDA Kazuhisa, FUJIMOTO Ryuichi, OSHIMA Tai, YAMAZAKI Masahiro, FUTAMOTO Kazuo, ISHISAKI Yoshitaka, YAMASAKI Noriko, KUSHINO Akihiro, KAGEI Tomohiro, HIROIKE Teppei, SHOJI Shuichi, KUDO Hiroyuki, YOKOYAMA Yuichi

2000(12) 7-11, Sep 12, 2000
Development of superconducting transition-edge X-ray microcalorimeters for use in orbit (II) : making a low noise measuring system in a dilution refrigerator

ISHISAKI Yoshitaka, YAMASAKI Noriko, OHASHI Takaya, KUSHINO Akihiro, KAGEI Tomohiro, HIROIKE Teppei, MIYAZAKI Toshiyuki, MITSUDA Kazuhisa, FUJIMOTO Ryuichi, IYOMOTO Naoko, OSHIMA Yasushi, YAMAZAKI Masahiro, FUTAMOTO Kazuo, SHOJI Shuichi, KUDO Hiroyuki, YOKOYAMA Yuichi

2000(12) 13-18, Sep 12, 2000
X-Ray Resonance Photon Beaming in the Accretion Column of Magnetic Cataclysmic Variables

Terada Y., Makishima K., Ishida M., Fujimoto R., Matuzaki K., Imanari T.

Meeting abstracts of the Physical Society of Japan, 55(2) 75-75, Sep 10, 2000
Development of superconducting transition-edge X-ray microcalorimetors (III) : current status and overview

Ishisaki Yoshitaka, Kagei Tomohiro, Ohashi Takaya, Yamasaki Noriko, Kushino Akihiro, Hiroike Teppei, Miyazaki Toshiyuki, Mitsuda Kazuhisa, Fujimoto Ryuichi, Iyomoto Naoko, Oshima Yasushi, Yamazaki Masahiro, Futamoto Kazuo, Shoji Syuichi, Kudo Hiroyuki, Yokoyama Yuichi

Meeting abstracts of the Physical Society of Japan, 55(2) 70-70, Sep 10, 2000
Development of superconducting transition-edge X-ray microcalorimetors (IV)

Kagei Tomohiro, Ohashi Takaya, Yamasaki Noriko, Ishisaki Yoshitaka, Kushino Akihiro, Hiroike Teppei, Miyazaki Toshiyuki, Mitsuda Kazuhisa, Fujimoto Ryuichi, Iyomoto Naoko, Oshima Yasushi, Yamazaki Masahiro, Futamoto Kazuo, Shoji Syuichi, Kudo Hiroyuki, Yokoyama Yuichi

Meeting abstracts of the Physical Society of Japan, 55(2) 70-70, Sep 10, 2000
TES型X線マイクロカロリメータとSQUIDアンプ読みだし系の開発

山崎正裕, 満田和久, 藤本龍一, 伊予本直子, 宮崎利行, 大島泰, 二元和朗, 庄子習一, 工藤寛之, 横山雄一, 大橋隆哉, 山崎典子, 石崎欣尚, 伊藤千枝, 藤本弦, 影井智宏

日本天文学会年会講演予稿集, 2000, 2000
「あすか」による超大光度赤外線銀河(ULIRG)のX線観測

穴吹直久, 米徳大輔, 中川貴雄, 藤本龍一

日本天文学会年会講演予稿集, 2000, 2000
「あすか」による超大光度赤外線銀河(ULIRG)のX線観測 II

米徳大輔, 穴吹直久, 中川貴雄, 藤本龍一

日本天文学会年会講演予稿集, 2000, 2000
Design and performance of the Astro-E/XRS microcalorimeter array and anti-coincidence detector

C. K. Stahle, M. D. Audley, K. R. Boyce, R. P. Brekosky, R. Fujimoto, K. C. Gendreau, J. D. Gygax, Y. Ishisaki, R. L. Kelley, R. A. McClanahan, T. Mihara, K. Mitsuda, S. H. Moseley, D. B. Mott, F. S. Porter

Proceedings of SPIE - The International Society for Optical Engineering, 3765 128-136, Dec 1, 1999
Development of a high energy resolution X-ray micro calorimeter using TES

KUDO Hiroyuki, YOKOYAMA Yuichi, SHOJI Shuichi, OSHIMA Tohru, ARUGA Youichi, MAEGAMI Kana, FUJIMOTO Ryuichi, MIYAZAKI Toshiyuki, MITSUDA Kazuhisa

1999(1) 7-11, Nov 12, 1999
28a-YK-7 Development of X-ray Microcalorimeters with High Spectroscopic and Imaging Capabilities II

Oshima Tai, Maegami Kana, Miyazaki Toshiyuki, Ariga Youichi, Fujimoto Ryuichi, Mitsuda Kazuhisa, Kudo Hiroyuki, Yokoyama Yuichi, Shoji Shuichi, Shimizu Hirohiko, Mihara Tatehiro

Meeting abstracts of the Physical Society of Japan, 54(1) 76-76, Mar 15, 1999
チタン薄膜を用いたX線マイクロカロリメータの開発成果報告

前神佳奈, 満田和久, 藤本龍一, 宮崎利行, 有賀洋一, 大島泰, 庄子習一, 工藤寛之, 横山雄一

搭載機器基礎開発成果報告書, 12, 1999
Studies in Thermometers for a Bolometer Driven in Very Low Temperature

KUDO Hiroyuki, YOKOYAMA Yuichi, SHOJI Shuichi, ARUGA Youichi, FUJIMOTO Ryuichi, MAEGAMI Kana, MIYAZAKI Toshiyuki, MITSUDA Kazuhisa

1998(1) 1-6, Nov 6, 1998
23p-J-8 Development of X-ray Microcalorimeters with High Spectroscopic and Imaging Capabilities

Miyazaki Toshiyuki, Konno Yasutaka, Ariga Youichi, Maegami Kana, Fujimoto Ryuichi, Mitsuda Kazuhisa, Kudo Hiroyuki, Nakata Taro, Shoji Shuichi, Shimizu Hirohiko, Mihara Tatehiro, Oku Takayuki, Sato Hiromi

Meeting abstracts of the Physical Society of Japan, 52(2) 83-83, Sep 2, 1997
極低温装置用ショックアブソーバーの設計と性能評価

井上一, 石田学, 小川原嘉明, 藤本龍一, 満田和久, 伊藤真之, 京谷誠, 平林誠之

搭載機器基礎開発成果報告書, 10, 1997
X-ray observations of the BL lacertae object OJ 287 with ASCA

Idesawa, E., Tashiro, M., Makishima, K., Kubo, H., Otani, C., Fujimoto, R., Kii, T., Makino, F., Takahashi, T., Ueda, Y., Ohashi, T.

Publications of the Astronomical Society of Japan, 49(6) 631-637, 1997
Observation of infrared ray galaxy IRAS05189-2524 by ASCA.

中川貴雄, 紀伊恒男, 藤本龍一, 小賀坂康志, 宮崎利行, 川辺良平

日本天文学会年会講演予稿集, 1996, 1996
Motion of molecular gas in central core of infrared ray galaxy NGC6240.

中川貴雄, 奥村幸子, 川辺良平, 紀伊恒男, 藤本龍一, 小賀坂康志, 石井景子, 萩原喜昭

日本天文学会年会講演予稿集, 1996, 1996
Will the infrared ray galaxy evolve to AGN ?

中川貴雄, 紀伊恒男, 藤本龍一, 小賀坂康志, 宮崎利行, 井上一, 川辺良平

日本天文学会年会講演予稿集, 1996, 1996
Observation IRAS galaxy Mrk273 by ASCA.

宮崎利行, 中川貴雄, 藤本龍一, 紀伊恒男, 小賀坂康志, 川辺良平

日本天文学会年会講演予稿集, 1996, 1996
ASCA Observation of the Supernova Remnant W49B

FUJIMOTO Ryuichi, TANAKA Yasuo, INOUE Hajime, ISHIDA Manabu, ITOH Masayuki, MITSUDA Kazuhisa, SONOBE Takashi, TSUNEMI Hiroshi, MURAKAMI Hiroyuki, KOYAMA Katsuji, HAYASHI Ichizo, IKEDA Kazuaki, RASMUSSEN Andy, RICKER George, BECKER Christopher M.

Publications of the Astronomical Society of Japan, 47(5) L31-L35, Oct 25, 1995
活動銀河核 Infrared-Seleted QuasarのX線特性

小賀坂康志, 紀伊恒男, 中川貴雄, 大谷知行, 藤本龍一, 井上一

日本天文学会年会講演予稿集, 1995, 1995
30p-YW-2 Observation of SNR with the ASCA satellite I(X-ray emission from the plasam in NEI condition)

Tsunemi H, Miyata M, Murakami H, Tamura K, Fujimoto R, Koyama K, Hayashi I

Abstracts of the meeting of the Physical Society of Japan. Annual meeting, 49(1) 174-174, Mar 16, 1994
29a-YW-7 Observations of normal galaxies with Asca

Makishima K, Ishizaki Y, Fukazawa Y, Matsusita K, Okada K, Awaki H, Tsuru T, Matsumoto H, Takano M, Fujimoto R, Mitsuda K, Ohashi T, Mihara T, Iwasawa K, Canizares C, Mushotzky R, Fabian A

Abstracts of the meeting of the Physical Society of Japan. Annual meeting, 49(1) 168-168, Mar 16, 1994
DISCOVERY OF AN OBSCURED LOW-LUMINOSITY ACTIVE NUCLEUS IN THE SPIRAL GALAXY NGC-4258

K MAKISHIMA, R FUJIMOTO, Y ISHISAKI, T KII, M LOEWENSTEIN, R MUSHOTZKY, P SERLEMITSOS, T SONOBE, M TASHIRO, T YAQOOB

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 46(3) L77-&, 1994
NGC6240: AGN in an Ultraluminous infrared Galaxy!

中川貴雄, 紀伊恒男, 小賀坂康志, 藤本龍一, 川辺良平

日本天文学会年会講演予稿集, 1994, 1994
Astro‐D搭載用位置検出型ガス蛍光比例計数管(GIS)

池辺靖, 大橋隆哉, 牧島一夫, 田代信, 三原建弘, 鶴剛, 井上一, 石田学, 藤本龍一

日本天文学会年会講演予稿集, 1992 143, 1992
27p-SC-7 The Developement of Hard X-ray Telescope for Solar-A Satellite

印田美香, 牧島一夫, 小杉健郎, 鶴剛, 石崎欣尚, 藤本龍一, 坂尾太郎, 澤正樹, 村上敏夫

春の分科会講演予稿集, 1991(1) 81-81, Mar 11, 1991

Professional Memberships

Research Projects

超精密X線スペクトルの輝線形状による銀河団ガスの乱流分布の推定

科学研究費助成事業基盤研究(C), 日本学術振興会, Apr, 2023 - Mar, 2026

藤本龍一
中性粒子計測における超伝導転移端検出器の安定動作に向けた基盤構築

科学研究費助成事業新学術領域研究(研究領域提案型), 日本学術振興会, Apr, 2019 - Mar, 2021

藤本龍一
The dark side of universe investigated with X-ray microcalorimeters

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Japan Society for the Promotion of Science, Apr, 2013 - Mar, 2017

MITSUDA KAZUHISA
Development of a cryogenic high-resolution X-ray spectrometer and its operation environment for exploring formation of large-scale structures in the universe

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, Apr, 2011 - Mar, 2014

FUJIMOTO Ryuichi, EZOE Yuichiro
宇宙X線観測用精密分光装置を応用した可搬型の微量環境放射線計測装置の試作

科研費挑戦的萌芽研究, Apr, 2008 - Mar, 2011

藤本龍一

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