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Engineering educational research section Semiconductor Science and Applied Physics Program |
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MORI Koji
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Degree 【 display / non-display 】
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Doctor (Science) ( 2002.6 Osaka University )
Research Areas 【 display / non-display 】
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Natural Science / Astronomy / X-ray and Gamma-ray astrophysics
Papers 【 display / non-display 】
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Asymmetric Distribution of Fe-peak Elements in Cassiopeia A Revealed by XRISM Reviewed International coauthorship
Sato, T., Fujimoto, S., Mori, K., et al.
The Astrophysical Journal 2026.4
Language：English Publishing type：Research paper (scientific journal)
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Zhang C., Zhuravleva I., Heinrich A., Bellomi E., Truong N., Zuhone J., Churazov E., Eckart M.E., Fujita Y., Hlavacek-Larrondo J., Ichinohe Y., Markevitch M., Matsushita K., Mernier F., Miller E.D., Mori K., Nakajima H., Ogorzalek A., Porter F.S., Tümer A., Ueda S., Werner N.
Astronomy and Astrophysics 707 2026.3
Publishing type：Research paper (scientific journal) Publisher：Astronomy and Astrophysics
We present extended gas kinematic maps of the Perseus cluster based on a combination of five new XRISM/Resolve pointings observed in 2025 with four performance verification datasets from 2024, totaling a net exposure of 745 ks. To date, Perseus remains the only cluster that has been extensively mapped out to ≃0.7r <inf>2500</inf> by XRISM/Resolve, while simultaneously offering sufficient spatial resolution to resolve gaseous substructures driven by mergers and active galactic nucleus (AGN) feedback. Our observations cover multiple radial directions and a broad range of dynamical scales, enabling us to characterize the kinematic properties of the intracluster medium up to a scale of ∼500 kpc. In the measurements, we detected high-velocity dispersions (≃300km s<sup>−1</sup>) in the eastern region of the cluster that are spatially coincident with the extended X-ray surface brightness excess and correspond to a nonthermal pressure fraction of ≃7 − 13%. The velocity field outside the AGN-dominant region can be effectively described by a single, large-scale kinematic driver based on the velocity structure function, which statistically favors an energy injection scale of at least a few hundred kpc. The estimated turbulent dissipation energy is comparable to the gravitational potential energy released by a recent merger, implying a significant role of turbulent cascade in the merger energy conversion. In the bulk velocity field, we observed a dipole-like pattern along the east-west direction with an amplitude of ≃ ± 200 − 300 km s<sup>−1</sup>, indicating rotational motions induced by the recent merger event. This feature constrains the viewing direction to ≃30° −50° relative to the normal of the merger plane. Our hydrodynamic simulations suggest that Perseus has experienced at least two energetic mergers since redshift z ∼ 1, the most recent of which is associated with the radio galaxy IC310, in agreement with recent SRG/eROSITA findings. This study showcases exciting scientific opportunities for future missions with high-resolution spectroscopic capabilities (e.g., HUBS, LEM, and NewAthena).
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A fast starburst wind consumes most of the energy from supernovae Reviewed
XRISM collabration including Mori, K.
Nature 2026.3
Language：English Publishing type：Research paper (scientific journal)
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Disentangling multiple gas kinematic drivers in the Perseus galaxy cluster Reviewed
Bellomi E., Zhuravleva I., Heinrich A., Zhang C., ZuHone J., Vigneron B., Ueda S., Truong N., Stancil P.C., Shefler L., Migkas K., Meunier J., Hlavacek-Larrondo J., Drury I., Yukita M., Yoshida T., Yoneyama T., Yaqoob T., Yamauchi S., Yamauchi M., Yamasaki N., Yamaoka K., Yamaguchi H., Yamada S., Yamada S., Williams B.J., Watanabe S., Vink J., Uno S., Ueda Y., Uchiyama H., Uchida Y., Uchida N., Uchida H., Tümer A., Tsuru T.G., Tsunemi H., Tsujimoto M., Tsuboi Y., Terashima Y., Terada Y., Tashiro M., Tanimoto A., Tanaka T., Tamura K., Tamagawa T., Takeo M., Takahashi H., Szymkowiak A., Suzuki H., Smith R., Simionescu A., Shidatsu M., Seta H., Sawada M., Sato T., Sato K., Pottschmidt K., Porter F.S., Plucinsky P., Petre R., Paltani S., Ota N., Okajima T., Ogorzalek A., Ogawa S., Odaka H., Noda H., Nobukawa M., Nobukawa K., Ness J.U., Nakazawa K., Nakajima H., Mushotzky R., Murakami H., Mukai K., Mori K., Mizuno T., Mizumoto M., Mitsuishi I., Miller J.M., Miller E.D., Mernier F., McNamara B., McCammon D., Matsushita K., Matsumoto H., Markevitch M., Maeda Y., Loewenstein M., Leutenegger M., Kubota A., Kohmura T., Kobayashi S., Kitamoto S., Kilbourne C., Kelley R., Kanemaru Y., Katsuda S., Kara E.
Nature 650 ( 8101 ) 309 - 313 2026.2
Publishing type：Research paper (scientific journal) Publisher：Nature
Galaxy clusters, the Universe’s largest halo structures, are filled with an X-ray-emitting gas with a temperature between 10 million and 100 million degrees. Their evolution is shaped by energetic processes such as feedback from supermassive black holes (SMBHs) and mergers with other cosmic structures<sup>1, 2–3</sup>. The imprints of these processes on gas kinematics remain largely unknown, restricting our understanding of energy conversion within clusters<sup>4</sup>. High-resolution spectral mapping with the X-Ray Imaging and Spectroscopy Mission (XRISM) observatory<sup>5</sup> offers a way forward<sup>6,7</sup>. Here we present XRISM kinematic measurements of the Perseus cluster, radially covering the extent of its cool core. We find direct evidence for at least two dominant drivers of gas motions operating on distinct physical scales: a small-scale driver in the inner approximately 60 kpc, probably associated with the SMBH feedback; and a large-scale driver in the outer core, powered by mergers. This finding suggests that, during the active phase, SMBH feedback drives gas motions, which, if fully dissipated into heat, could have a substantial role in offsetting radiative cooling losses in the Perseus core. Our study underscores the necessity of kinematic mapping observations of extended sources to robustly characterize the velocity fields and their role in the evolution of massive halos. It further offers a kinematic diagnostic for SMBH feedback models.
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A XRISM/Resolve View of the Dynamics in the Hot Gaseous Atmosphere of M87 Reviewed International coauthorship
XRISM collabration including Mori, K.
The Astrophysical Journal 2026.2
Language：English Publishing type：Research paper (scientific journal)
MISC 【 display / non-display 】
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SXS装置によるかに超新星残骸の熱的プラズマ放射探査 Invited
辻本匡弘、森浩二
天文月報 2019.6
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：日本天文学会
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超新星残骸から探るIa型超新星爆発の親星の金属量
森浩二
天文月報 2014.6
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：日本天文学会
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宮崎県における高等学校と大学との物理教育に関する連絡会
森浩二、木村英二
大学の物理教育 2013.11
Language：Japanese Publishing type：Research paper, summary (national, other academic conference) Publisher：日本物理学会
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Ｘ線で見る星座
森浩二
数研出版株式会社サイエンスネット第37号 37 2009.11
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (other) Publisher：数研出版株式会社
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Ｘ線天文衛星 Suzaku および Chandra を用いた小マゼラン星雲中の超新星残骸 0103-72.6 の観測的研究
川井田英広, 木村結樹, 森浩二
宮崎大学工学部紀要 ( 37 ) 43 - 50 2008.8
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution) Publisher：宮崎大学工学部
Presentations 【 display / non-display 】
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CTAO 報告 248：全体報告
齋藤隆之、森浩二、他
日本物理学会2026年春季大会
Event date： 2026.3.23 - 2026.3.26
Presentation type：Oral presentation (general)
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X線分光撮像衛星 XRISM 搭載軟X線撮像装置 Xtend による突発天体探査・速報
米山友景、森浩二、他
日本物理学会2026年春季大会
Event date： 2026.3.23 - 2026.3.26
Presentation type：Oral presentation (general)
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X線分光撮像衛星XRISM搭載軟X線撮像装置Xtendの現状(5)
野田博文、森浩二、他
日本物理学会2026年春季大会
Event date： 2026.3.23 - 2026.3.26
Presentation type：Oral presentation (general)
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超高層大気観測用X線カメラSUIMフライトモデルの地上試験X線スペクトル
松井怜生、森浩二、他
日本物理学会2026年春季大会
Event date： 2026.3.23 - 2026.3.26
Presentation type：Oral presentation (general)
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超高層大気観測専用X線カメラ「SUIM」に搭載するスリットコリメータの開発
桒野慧、森浩二、他
日本物理学会2026年春季大会
Event date： 2026.3.23 - 2026.3.26
Presentation type：Oral presentation (general)
Awards 【 display / non-display 】
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日本物理学会若手奨励賞
2009.3 日本物理学会
森浩二
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
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井上研究奨励賞
2005.2 井上科学振興財団
森浩二
Award type：Award from publisher, newspaper, foundation, etc. Country：Japan
Grant-in-Aid for Scientific Research 【 display / non-display 】
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終端衝撃波のＸ線撮像分光による銀河系内最強加速器「カニ星雲」の加速機構の解明
Grant number：23K20850 2024.04 - 2026.03
独立行政法人日本学術振興会 科学研究費基金 基盤研究(B)
Authorship：Principal investigator
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終端衝撃波のＸ線撮像分光による銀河系内最強加速器「カニ星雲」の加速機構の解明
Grant number：21H01095 2021.04 - 2026.03
独立行政法人日本学術振興会 科学研究費補助金 基盤研究(B)
Authorship：Principal investigator
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カニ星雲のサブ秒角スケールでの精密X線分光による電磁流体加速機構の解明
Grant number：21J10842 2021.04 - 2023.03
独立行政法人日本学術振興会 科学研究費補助金 特別研究員奨励費
Authorship：Principal investigator
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超新星残骸のＸ線精密撮像分光から探るIa型超新星の親星の起源
Grant number：16H03983 2019.04 - 2020.03
科学研究費補助金 基盤研究(B)
Authorship：Principal investigator
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超新星残骸のＸ線精密撮像分光から探るIa型超新星の親星の起源
Grant number：16H03983 2018.04 - 2019.03
科学研究費補助金 基盤研究(B)
Authorship：Principal investigator
Other research activities 【 display / non-display 】
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国立天文台ハワイ観測所 Subaru Seminars
2005.02
国立天文台ハワイ観測所において「Recent progress in X-ray studies of the Crab Pulsar Wind Nebula」というタイトルでセミナーをおこなった。
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大阪大学理学部X線天文グループセミナー
2004.12
大阪大学理学部X線天文グループに招かれて「パルサー星雲観測の最近の進展」というタイトルでセミナーをおこなった。
Available Technology 【 display / non-display 】
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Ｘ線天文衛星を用いた高エネルギー天体の観測的研究
Ｘ線に感度を持つ衛星搭載用半導体カメラの開発
地上で動作可能な放射線イメージングカメラの開発Home Page： 高エネルギー宇宙物理学研究室
Related fields where technical consultation is available：・ Ｘ線・ガンマ線・陽子・中性子を含む放射線イメージング
・ 人工衛星に搭載する機器開発一般Message：お手持ちの技術を宇宙開発・放射線測定等に応用したいという場合は、ぜひご連絡ください