宇宙科学広報・普及主幹付
Profile Information
- Affiliation
- Professor, Institute of Space and Astronautical Science, Japan Aerospace Exploration AgencyGraduate School of Science, Department of Physics, The University of Tokyo(PI), International Center for Quantum-field Measurement Systems for Studies of the Universe and Particles (QUP)Graduate School of Science, Kitasato University
- Degree
- Ph. D.(Mar, 1996, The University of Tokyo)
- ORCID ID
https://orcid.org/0000-0003-4885-5537- J-GLOBAL ID
- 200901003330670433
- Researcher ID
- C-2252-2008
- researchmap Member ID
- 5000019022
- External link
Research Interests
8Research Areas
2Research History
2Education
2-
Apr, 1989 - Mar, 1993
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Apr, 1985 - Mar, 1989
Committee Memberships
2-
Oct, 2017 - Sep, 2023
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Oct, 2014 - Sep, 2017
Papers
243-
Cryogenics, 138 103795-103795, Mar, 2024 Peer-reviewed
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Journal of Geophysical Research: Space Physics, 128(12) e2023JA032069, Dec 19, 2023 Peer-reviewed
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Publications of the Astronomical Society of Japan, 75(6) 1324-1336, Nov 14, 2023 Peer-reviewedAbstract Observations of the hot X-ray emitting interstellar medium in the Milky Way are important for studying the stellar feedback and for understanding the formation and evolution of galaxies. We present measurements of the soft X-ray background emission for 130 Suzaku observations at 75° < l < 285° and |b| > 15°. With the standard soft X-ray background model consisting of the local hot bubble and of the Milky Way halo, residual structures remain at 0.7–1 keV in the spectra of some regions. Adding a collisional-ionization-equilibrium component with a temperature of ∼0.8 keV, much higher than the virial temperature of the Milky Way, significantly reduces the derived C-statistic for 56 out of 130 observations. The emission measure of the 0.8 keV component varies by more than an order of magnitude: assuming the solar abundance, the median value is $3 \times 10^{-4}\, \rm {cm^{-6}\ pc}$ and the 16th–84th percentile range is $(1\!-\!8) \times 10^{-4}\, \rm {cm^{-6}\ pc}$. Regions toward the Orion–Eridanus superbubble, having a large cavity extending from the Ori OB1 association, have the highest emission measures of the 0.8 keV component. While the scatter is large, the emission measures tend to be higher toward lower galactic latitudes. We discuss possible biases caused by the solar wind charge exchange, stars, and background groups. The 0.8 keV component is probably heated by supernovae in the Milky Way disk, possibly related to Galactic fountains.
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IEEE Transactions on Applied Superconductivity, 33(5) 1-4, Aug, 2023 Peer-reviewed
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Journal of Low Temperature Physics, 211(5-6) 255-264, Feb 4, 2023 Peer-reviewedAbstract A $$^{57}$$Fe nucleus in the solar core could emit a 14.4-keV monochromatic axion through the M1 transition if a hypothetical elementary particle, axion, exists to solve the strong CP problem. Transition edge sensor (TES) X-ray microcalorimeters can detect such axions very efficiently if they are again converted into photons by a $$^{57}$$Fe absorber. We have designed and produced a dedicated TES array with $$^{57}$$Fe absorbers for the solar axion search. The iron absorber is set next to the TES, keeping a certain distance to reduce the iron-magnetization effect on the spectroscopic performance. A gold thermal transfer strap connects them. A sample pixel irradiated from a $$^{55}$$Fe source detected 698 pulses. In contrast to thermal simulations, we consider that the pulses include either events produced in an iron absorber or gold strap at a fraction dependent on the absorption rate of each material. Furthermore, photons deposited on the iron absorber are detected through the strap as intended. The identification of all events still needs to be completed. However, we successfully operated the TES with the unique design under iron magnetization for the first time.
Misc.
189-
Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, Dec 21, 2020
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Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X, Dec 16, 2020
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Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X, Dec 16, 2020
Teaching Experience
1-
Mar, 2003 - PresentAstrophysics I (Dept. of Physics, University. of Tokyo)
Professional Memberships
3-
2010 - Present
Research Projects
21-
科学研究費助成事業 学術変革領域研究(A), 日本学術振興会, Nov, 2020 - Mar, 2025
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科学研究費助成事業 基盤研究(A), 日本学術振興会, Apr, 2019 - Mar, 2022
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科学研究費助成事業 基盤研究(B), 日本学術振興会, Apr, 2018 - Mar, 2022
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Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, Apr, 2018 - Mar, 2021
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科学研究費助成事業 基盤研究(S), 日本学術振興会, May, 2014 - Mar, 2019
教育内容やその他の工夫
1-
SubjcetGraduate School in ISASSummaryWe accept graduate students from University of Tokyo and Kitasato University. Our main scope is observational research of the large scale structure in the Universe utilizing X-ray spectroscopy.
During the graduate school, professional education for development of new detectors and their applications, and observational astrophysics are accessed.
● 指導学生等の数
8-
Fiscal Year2018年度(FY2018)Doctoral program1Master’s program1
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Fiscal Year2019年度(FY2019)Doctoral program1Master’s program3
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Fiscal Year2020年度(FY2020)Doctoral program1Master’s program3
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Fiscal Year2018年度(FY2018)Doctoral program1Master’s program1
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Fiscal Year2019年度(FY2019)Doctoral program1Master’s program3
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Fiscal Year2020年度(FY2020)Doctoral program1Master’s program3
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Fiscal Year2022年度(FY2022)Doctoral program3Master’s program2
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Fiscal Year2023年度(FY2023)Doctoral program2Master’s program1
● 指導学生の顕著な論文
6-
Student nameRyota TakakuStudent affiliation東京大学Author(s), journal, volume number, pagination (year of publication)Takaku et al. , Journal of Applied Physics, 128(22), id.225302, (2020)TitleBroadband, millimeter-wave anti-reflective structures on sapphire ablatedwith femto-second laserDOIhttp://doi.org/10.1063/5.0022765
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Student nameYuki NakashimaStudent affiliationUniv. of TokyoAuthor(s), journal, volume number, pagination (year of publication)Nakashima et al. Applied Physics Letters, 117 122601 (2020)TitleLow-noise microwave SQUID multiplexed readout of 38 x-ray transition-edge sensor microcalorimetersDOIhttp://doi.org/10.1063/5.0016333
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Student nameRyohei KonnoStudent affiliationKitasato Univ.Author(s), journal, volume number, pagination (year of publication)Konno et al. Journal of Low Temperature Physics 199, 654 (2019)TitleDevelopment of TES micsrocalorimters with solar-axion converterDOIhttp://doi.org/10.1007/s10909-019-02257-9
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Student nameRyo YamamotoStudent affiliationUniv. of TokyoAuthor(s), journal, volume number, pagination (year of publication)Yamamoto et al. , Journal of Cosmokogy and Astrophysics, 02 (2020) 011TitleA Search for a Contribution from Axion-Like Particles to the X-Ray Diffuse Background Utilizing the Earth's Magnetic FieldDOIhttp://doi.org/10.1088/1475-7516/2020/02/011
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Student nameNorio SekiyaStudent affiliationUniversity. of TokyoAuthor(s), journal, volume number, pagination (year of publication)Sekiya, Yamasaki, and Mitsuda, Publications of Astronomical Society in Japan, 68(SP1), S31 (2016)TitleSearch for a keV Signature of Radiatively Decaying Dark Matter with Suzaku XIS Observations of the X-ray Diffuse BackgroundDOIhttp://doi.org/10.1093/pasj/psv081
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Student nameIkuyuki MitsuishiStudent affiliationUniv. of TokyoAuthor(s), journal, volume number, pagination (year of publication)Mitsuishi, Yamasaki, and Takei, Publications of Astronomical Society in Japan, 65, 44 (2013)TitleAn X-Ray Study of the Galactic-Scale Starburst-Driven Outflow in NGC 253DOIhttp://doi.org/10.1093/pasj/65.2.44
● 専任大学名
1-
Affiliation (university)東京大学（University of Tokyo)
● 所属する所内委員会
1-
ISAS CommitteeSteering committee for ISAS nono-electronics clean room
