Curriculum Vitaes
Profile Information
- Affiliation
- School of Medicine Faculty of Medicine, Fujita Health University
- Degree
- 博士(理学)(名古屋大学)
- J-GLOBAL ID
- 200901003971539256
- researchmap Member ID
- 6000001840
Research Interests
8Research Areas
4Research History
1Education
1Papers
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The Astrophysical Journal, 998(2) 210-210, Feb 11, 2026 Peer-reviewedAbstract The XRISM/Resolve microcalorimeter directly measured the gas velocities in the core of the Virgo Cluster, the closest example of active galactic nucleus (AGN) feedback in a cluster. This proximity allows us to resolve the kinematic impact of feedback on scales down to 5 kpc. Our spectral analysis reveals a high velocity dispersion of km s −1 near the AGN, which steeply declines to ∼60 km s −1 between 5 and 25 kpc in the northwest direction. The observed line-of-sight bulk velocity in all regions is broadly consistent with the central galaxy, M87, with a mild trend toward blueshifted motions at larger radii. Systematic uncertainties have been carefully assessed and do not affect the measurements. The central velocities, if attributed entirely to isotropic turbulence, correspond to a transonic intracluster medium at sub-6 kpc scales with 3D Mach number and a nonthermal pressure fraction of . Simple models of weak shocks and sound waves and calculations assuming isotropic turbulence both support the hypothesis that the velocity field reflects a mix of shock-driven expansion and turbulence. Compared to other clusters observed by XRISM to date, M87’s central region stands out as the most kinematically disturbed, exhibiting both the highest velocity dispersion and the largest 3D Mach number, concentrated at the smallest physical scales.
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Nature, Jan 28, 2026 Peer-reviewed
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NATURE ASTRONOMY, 10(1), Jan, 2026
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The Astrophysical Journal Letters, 994(1) L28-L28, Nov 18, 2025Abstract We stack 3.75 Ms of early XRISM Resolve observations of 10 galaxy clusters to search for unidentified spectral lines in the E = 2.5–15 keV band (rest frame), including the E = 3.5 keV line reported in earlier low spectral resolution studies of cluster samples. Such an emission line may originate from the decay of the sterile neutrino, a warm dark matter (DM) candidate. No unidentified lines are detected in our stacked cluster spectrum, with the 3 σ upper limit on the m s ∼ 7.1 keV DM particle decay rate (which corresponds to an E = 3.55 keV emission line) of Γ ∼ 1.0 × 10 −27 s −1 . This upper limit is 3–4 times lower than the one derived by Hitomi Collaboration from the Perseus observation but still 5 times higher than the XMM-Newton detection reported by E. Bulbul et al. in the stacked cluster sample. XRISM Resolve, with its high spectral resolution but small field of view, may reach the sensitivity needed to test the XMM-Newton cluster sample detection by combining several years worth of future cluster observations.
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Publications of the Astronomical Society of Japan, 77(6) 1278-1289, Nov 17, 2025Abstract We present results from XRISM/Resolve observations of the core of the galaxy cluster Abell 2319, focusing on its kinematic properties. The intracluster medium (ICM) exhibits temperatures of approximately 8 keV across the core, with a prominent cold front and a high-temperature region ($\sim$11 keV) in the north-west. The average gas velocity in the $3{^{\prime } } \times$ $4 {^{\prime } }$ region around the brightest cluster galaxy (BCG) covered by two Resolve pointings is consistent with that of the BCG to within 40 km s$^{-1}$ and we found modest average velocity dispersion of 230–250 km s$^{-1}$. On the other hand, spatially resolved spectroscopy reveals interesting variations. A blueshift of up to $\sim$230 km s$^{-1}$ is observed around the east edge of the cold front, where the gas with the lowest specific entropy is found. The region further south inside the cold front shows only a small velocity difference from the BCG; however, its velocity dispersion is enhanced to $\sim$400 km s$^{-1}$, implying the development of turbulence. These characteristics indicate that we are observing sloshing motion with some inclination angle following BCG and that gas phases with different specific entropy participate in sloshing with their own velocities, as expected from simulations. No significant evidence for a high-redshift ICM component associated with the subcluster Abell 2319B was found in the region covered by the current Resolve pointings. These results highlight the importance of sloshing and turbulence in shaping the internal structure of Abell 2319. Further deep observations are necessary to better understand the mixing and turbulent processes within the cluster.
Misc.
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大気球シンポジウム: 2020年度 = Balloon Symposium: 2020, Nov, 2020大気球シンポジウム 2020年度(2020年11月5-6日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県 Balloon Symposium 2020 (November 5-6, 2020. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa Japan 著者人数: 67名 資料番号: SA6000151012 レポート番号: isas20-sbs-012
Presentations
61-
大気球シンポジウム: 2024年度, Oct, 2024, 宇宙航空研究開発機構宇宙科学研究所 (JAXA)(ISAS)レポート番号: isas24-sbs-008
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日本物理学会講演概要集(CD-ROM), 2024
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日本物理学会講演概要集(CD-ROM), 2024
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Balloon Symposium: 2023, Oct 1, 2023
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日本物理学会講演概要集(CD-ROM), 2023
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日本物理学会講演概要集(CD-ROM), 2023
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宇宙科学技術連合講演会講演集(CD-ROM), 2023
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宇宙科学技術連合講演会講演集(CD-ROM), 2023
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大気球シンポジウム: 2022年度 = Balloon Symposium: 2022, Nov, 2022, 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)大気球シンポジウム 2022年度(2022年11月7-8日. ハイブリッド開催(JAXA相模原キャンパス& オンライン)) Balloon Symposium 2022 (November 7-8, 2022. Hybrid(in-person & online) Conference (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan 著者人数: 87名 資料番号: SA6000177030 レポート番号: isas22-sbs-030
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大気球シンポジウム: 2020年度 = Balloon Symposium: 2020, Nov, 2020, 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)大気球シンポジウム 2020年度(2020年11月5-6日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)), 相模原市, 神奈川県 Balloon Symposium 2020 (November 5-6, 2020. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)), Sagamihara, Kanagawa Japan 著者人数: 67名 資料番号: SA6000151012 レポート番号: isas20-sbs-012
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Meeting Abstracts of the Physical Society of Japan, 2020, The Physical Society of Japan
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Meeting Abstracts of the Physical Society of Japan, 2020, The Physical Society of Japan
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Meeting Abstracts of the Physical Society of Japan, 2019, The Physical Society of Japan
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Meeting Abstracts of the Physical Society of Japan, 2018, The Physical Society of Japan
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Meeting Abstracts of the Physical Society of Japan, 2018, The Physical Society of Japan Invited
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第17回宇宙科学シンポジウム 講演集 = Proceedings of the 17th Space Science Symposium, Jan, 2017, 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)第17回宇宙科学シンポジウム (2017年1月5日-6日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)相模原キャンパス), 相模原市, 神奈川県 17th Space Science Symposium (January 5-6, 2017. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)Sagamihara Campus), Sagamihara, Kanagawa Japan 著者人数: 56名ほか (JAXA staff: Ishida, Manabu ; Kokubun, Motohide ; Watanabe, Shin ; Iizuka, Ryo ; Ohta, Masayuki ; Sato, Rie ; Takahashi, Tadayuki ; Hagino, Koichi ; Harayama, Atsushi ; Maeda, Yoshitomo) 資料番号: SA6000060046 レポート番号: P-004
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Meeting Abstracts of the Physical Society of Japan, 2017, The Physical Society of Japan
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Meeting Abstracts of the Physical Society of Japan, 2017, The Physical Society of Japan<p>NGHXTあらため、FORCE衛星は1-80 keVの広帯域X線を高感度で撮像分光し、まだ見ぬ隠されたブラックホールや超新星残骸のフィラメントでの粒子加速の探査を目指している。2016年に変更した計画の内容、検出器および望遠鏡の開発状況、およびサイエンス検討の進捗を報告する。</p>
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Meeting Abstracts of the Physical Society of Japan, 2016, The Physical Society of Japan (JPS)
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19aBB-4 Development of the model experiments which correct misunderstanding about a tidal phenomenonMeeting Abstracts of the Physical Society of Japan, 2016, The Physical Society of Japan (JPS)
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Meeting Abstracts of the Physical Society of Japan, 2016, The Physical Society of Japan
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Meeting Abstracts of the Physical Society of Japan, 2015, The Physical Society of Japan (JPS)
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Meeting Abstracts of the Physical Society of Japan, 2015, The Physical Society of Japan (JPS)
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Meeting Abstracts of the Physical Society of Japan, 2015, The Physical Society of Japan (JPS)
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Meeting Abstracts of the Physical Society of Japan, 2015, The Physical Society of Japan
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Meeting Abstracts of the Physical Society of Japan, 2015, The Physical Society of Japan
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Proceedings of the 12th Asia Pacific Physics Conference (APPC12), Apr, 2014
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Proceedings of the 12th Asia Pacific Physics Conference (APPC12), Apr, 2014
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Meeting Abstracts of the Physical Society of Japan, 2013, The Physical Society of Japan
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Meeting Abstracts of the Physical Society of Japan, 2013, The Physical Society of Japan
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Meeting abstracts of the Physical Society of Japan, Aug 24, 2012, The Physical Society of Japan (JPS)
Teaching Experience
1-
物理学 (藤田保健衛生大学)
Professional Memberships
1Research Projects
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2023 - Mar, 2027
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2018 - Mar, 2022