Updated on 2024/10/07

写真b

 
UCHIYAMA Yasunobu
 
*Items subject to periodic update by Rikkyo University (The rest are reprinted from information registered on researchmap.)
Affiliation*
Graduate School of Artificial Intelligence and Science Master's Program in Artificial Intelligence and Science
College of Science Department of Physics
Graduate School of Artificial Intelligence and Science Doctoral Program in Artificial Intelligence and Science
Title*
Professor
Degree
修士（理学） （ 東京大学 ） / 博士（理学） （ 東京大学 ）
Contact information
Mail Address
Research Interests

  • High Energy Astrophysics

    • Campus Career*
    • 4 2022 - Present 
      Graduate School of Artificial Intelligence and Science   Master's Program in Artificial Intelligence and Science   Professor
    • 4 2022 - Present 
      Graduate School of Artificial Intelligence and Science   Doctoral Program in Artificial Intelligence and Science   Professor
    • 4 2016 - Present 
      College of Science   Department of Physics   Professor
    • 4 2020 - 3 2022 
      Graduate School of Artificial Intelligence and Science   Artificial Intelligence and Science   Professor
    • 4 2016 - 3 2020 
      Graduate School of Science   Master's Program in Physics   Professor
    • 4 2016 - 3 2020 
      Graduate School of Science   Doctoral Program in Physics   Professor
    • 4 2013 - 3 2016 
      College of Science   Department of Physics   Associate Professor
    • 4 2013 - 3 2016 
      Graduate School of Science   Master's Program in Physics   Associate Professor
    • 4 2013 - 3 2016 
      Graduate School of Science   Doctoral Program in Physics   Associate Professor

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    Research Areas

    • Natural Science / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics

    • Natural Science / Astronomy

    Research History

    • 4 2020 - Present 
      RIKKYO UNIVERSITY   Graduate School of Artificial Intelligence and Science Artificial Intelligence and Science   Professor

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    • 4 2016 - Present 
      RIKKYO UNIVERSITY   College of Science Department of Physics   Professor

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    • 4 2016 - 3 2020 
      RIKKYO UNIVERSITY   Graduate School of Science Field of Study: Physics   Professor

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    • 4 2016 - 3 2020 
      RIKKYO UNIVERSITY   Graduate School of Science Field of Study: Physics   Professor

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    • 4 2013 - 3 2016 
      RIKKYO UNIVERSITY   College of Science Department of Physics   Associate Professor

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    Education

    • 4 1998 - 3 2003 
      The University of Tokyo   Graduate School, Division of Science

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      Country： Japan

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    • 4 1993 - 3 1998 
      The University of Tokyo   Faculty of Science

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      Country： Japan

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    Papers

    • Expansion Measurement of Supernova Remnant RX J1713.7-3946 Peer-reviewed

      Naomi Tsuji, Yasunobu Uchiyama

      Publications of the Astronomical Society of Japan   11 2016

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      Language：English   Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press  

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    • Chandra observations of the HII complex G5.89-0.39 and TeV gamma-ray source HESSJ1800-240B Peer-reviewed

      E. J. Hampton, G. Rowell, W. Hofmann, D. Horns, Y. Uchiyama, S. Wagner

      JOURNAL OF HIGH ENERGY ASTROPHYSICS11-12   1 - 19   9 2016

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      Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

      We present the results of our investigation, using a Chandra X-ray observation, into the stellar population of the massive star formation region G5.89-0.39, and its potential connection to the coincident TeV gamma-ray source HESSJ1800-240B. G5.89-0.39 comprises two separate HII regions G5.89-0.39A and G5.89-0.39B (an ultra-compact HII region). We identified 159 individual X-ray point sources in our observation using the source detection algorithm wavdetect. 35 X-ray sources are associated with the HII complex G5.89-0.39. The 35 X-ray sources represent an average unabsorbed luminosity (0.3-10keV) of similar to 10(30.5) erg/s, typical of B7-B5 type stars. The potential ionising source of G5.89-0.39B known as Feldt's star is possibly identified in our observation with an unabsorbed X-ray luminosity suggestive of a B7-B5 star. The stacked energy spectra of these sources is well-fitted with a single thermal plasma APEC model with kT similar to 5keV, and column density N-H= 2.6 x10(22)cm(-2)(A(V) similar to 10). The residual (source-subtracted) X-ray emission towards G5.89-0.39A and B is about 30% and 25% larger than their respective stacked source luminosities. Assuming this residual emission is from unresolved stellar sources, the total B-type-equivalent stellar content in G5.89-0.39A and B would be 75 stars, consistent with an earlier estimate of the total stellar mass of hot stars in G5.89-0.39. We have also looked at the variability of the 35 X-ray sources in G5.89-0.39. Ten of these sources are flagged as being variable. Further studies are needed to determine the exact causes of the variability, however the variability could point towards pre-main sequence stars. Such a stellar population could provide sufficient kinetic energy to account for a part of the GeV to TeV gamma-ray emission in the source HESSJ1800-240B. However, future arc-minute angular resolution gamma-ray imaging will be needed to disentangle the potential gamma-ray components powered by G5.89-0.39 from those powered by the W28 SNR. (C) 2016 Elsevier B.V. All rights reserved.

      DOI： 10.1016/j.jheap.2016.05.001

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    • The quiescent intracluster medium in the core of the Perseus cluster Peer-reviewed

      Hitomi Collaboration, F. Aharonian, H. Akamatsu, Y. Uchiyama

      Nature535 ( 7610 ) 117 - 121   7 2016

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      Language：English   Publishing type：Research paper (scientific journal)   Publisher：Nature Publishing Group  

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    • The First Fermi LAT Supernova Remnant Catalog Peer-reviewed

      Fermi-LAT Collaboration, F. Acero, M. Ackermann, M. Ajello, Y. Uchiyama

      The Astrophysical Journal Supplement Series224 ( 1 ) 8   5 2016

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      Language：English   Publishing type：Research paper (scientific journal)   Publisher：IOP Publishing  

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    • Fermi-LAT Observations of High-Energy Gamma-Ray Emission toward the Galactic Center Peer-reviewed

      Fermi-LAT Collaboration, M. Ajello, A. Albert, W. B. Atwood, Y. Uchiyama

      The Astrophysical Journal819 ( 1 ) 44   3 2016

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      Language：English   Publishing type：Research paper (scientific journal)   Publisher：IOP Publishing  

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    • Deep Morphological and Spectral Study of the SNR RCW 86 with Fermi-LAT Peer-reviewed

      Fermi-LAT Collaboration, M. Ajello, L. Baldini, G. Barbiellini, Y. Uchiyama

      The Astrophysical Journal819 ( 2 ) 98   3 2016

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      Language：English   Publishing type：Research paper (scientific journal)   Publisher：IOP Publishing  

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    • An extremely bright gamma-ray pulsar in the Large Magellanic Cloud Peer-reviewed

      M. Ackermann, A. Albert, L. Baldini, J. Ballet, G. Barbiellini, C. Barbieri, D. Bastieri, R. Bellazzini, E. Bissaldi, R. Bonino, E. Bottacini, T. J. Brandt, J. Bregeon, P. Bruel, R. Buehler, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, C. Cecchi, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, G. Chiaro, S. Ciprini, J. Cohen-Tanugi, A. Cuoco, S. Cutini, F. D'Ammando, F. de Palma, R. Desiante, S. W. Digel, L. Di Venere, P. S. Drell, C. Favuzzi, S. J. Fegan, E. C. Ferrara, A. Franckowiak, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, F. Giordano, G. Godfrey, I. A. Grenier, M. -H. Grondin, J. E. Grove, L. Guillemot, S. Guiriec, K. Hagiwara, A. K. Harding, E. Hays, J. W. Hewitt, A. B. Hill, D. Horan, T. J. Johnson, J. Knoediseder, M. Kuss, S. Larsson, L. Latronico, M. Lemoine-Goumard, J. Li, L. Li, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, S. Maldera, A. Manfreda, F. Marshall, P. Martin, M. Mayer, M. N. Mazziotta, P. F. Michelson, N. Mirabal, T. Mizuno, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, G. Naletto, E. Nuss, T. Ohsugi, M. Orienti, E. Orlando, D. Paneque, M. Pesce-Rollins, F. Piron, G. Pivato, T. A. Porter, S. Raino, R. Rando, M. Razzano, A. Reimer, O. Reimer, T. Reposeur, R. W. Romani, P. M. Saz Parkinson, A. Schulz, C. Sgro, E. J. Siskind, D. A. Smith, F. Spada, G. Spandre, P. Spinelli, D. J. Suson, H. Takahashi, J. B. Thayer, D. J. Thompson, L. Tibaldo, D. F. Torres, Y. Uchiyama, G. Vianello, K. S. Wood, M. Wood, L. Zampieri

      SCIENCE350 ( 6262 ) 801 - 805   11 2015

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      Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER ASSOC ADVANCEMENT SCIENCE  

      Pulsars are rapidly spinning, highly magnetized neutron stars, created in the gravitational collapse of massive stars. We report the detection of pulsed giga-electron volt gamma rays from the young pulsar PSR J0540-6919 in the Large Magellanic Cloud, a satellite galaxy of the Milky Way. This is the first gamma-ray pulsar detected in another galaxy. It has the most luminous pulsed gamma-ray emission yet observed, exceeding the Crab pulsar's by a factor of 20. PSR J0540-6919 presents an extreme test case for understanding the structure and evolution of neutron star magnetospheres.

      DOI： 10.1126/science.aac7400

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    • Study of Non-thermal X-ray Emission Produced by Sub-relativistic and Ultra-relativistic Particles in Supernova Remnants

      Yasunobu Uchiyama

          28 3 2003

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      Language：English   Publishing type：Doctoral thesis  

      We study sub-relativistic and ultra-relativistic components of high-energy particles associated with supernova remnants (SNRs) using X-ray imaging and spectroscopic observations with ASCA and Chandra. Based on the extensive analysis of two shell-type SNRs, gamma Cygni and RX J1713.7−3946, we have found new X-ray features in SNRs, namely (1) very flat-spectrum X-ray emission, and (2) unexpectedly complex structures in synchrotron X-ray images. We propose that the very flat X-ray spectrum is the characteristic bremsstrahlung X-ray spectrum, providing us a new diagnostic tool to study the largely-unknown component of low-energy cosmic rays in the Galaxy. Also we argue that the resolved X-ray features in the synchrotron X-ray images may challenge the perceptions of standard (diffusive shock-acceleration) models concerning the production, propagation and radiation of relativistic particles in supernova remnants.

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    Professional Memberships

    Research Projects

    • Study of acceleration of very high energy particles with H.E.S.S.

      International Joint Research Projects 

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      4 2014 - Present

      Grant type：Competitive

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    • Observations of high energy gamma rays with the Fermi-LAT

      International Joint Research Projects 

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      8 2008 - Present

      Grant type：Competitive

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    • 超新星残骸における宇宙線加速の研究

      国際共同研究 

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      4 2000 - Present

      Grant type：Competitive

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    • 巨大口径望遠鏡を用いた GeV ガンマ線観測による天体高エネルギー現象の解明

      日本学術振興会  科学研究費助成事業 

      内山 泰伸

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      4 2014 - 3 2017

      Authorship：Principal investigator  Grant type：Competitive

      H.E.S.S. 望遠鏡による超高エネルギーガンマ線観測を推進する。特に超新星残骸の観測により銀河宇宙線の起源を解明すること、パルサー星雲のガンマ線フレア現象の観測により磁気リコネクションによる超高エネルギー電子の加速を研究することを主要テーマとする。

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