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The Study of the Highest Energy Cosmic Ray

Research Project

Project/Area Number 07247102
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Research InstitutionThe University of Tokyo

Principal Investigator

TESHIMA Masahiro  Univ. of Tokyo, ICRR, Assoc. Professor, 宇宙線研究所, 助教授 (40197778)

Co-Investigator(Kenkyū-buntansha) OHNISHI Munehiro  Univ. of Tokyo, ICRR, Assistant, 宇宙線研究所, 助手 (10260514)
HAYASHIDA Naoaki  Univ. of Tokyo, ICRR, Assistant, 宇宙線研究所, 助手 (50114616)
YUDA Toshinori  Univ. of Tokyo, ICRR, Professor, 宇宙線研究所, 教授 (60092368)
ISHIKAWA Fumio  Univ. of Tokyo, ICRR, Assistant, 宇宙線研究所, 助手 (30092133)
YOSHIDA Shigeru  Univ. of Tokyo, ICRR, Assistant, 宇宙線研究所, 助手 (00272518)
千川 道幸  近畿大学, 理工学部, 講師 (50179941)
永野 元彦  東京大学, 宇宙線研究所, 教授 (00013384)
佐々木 真人  東京大学, 宇宙線研究所, 助教授 (40242094)
Project Period (FY) 1995 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥258,300,000 (Direct Cost: ¥258,300,000)
Fiscal Year 1998: ¥26,400,000 (Direct Cost: ¥26,400,000)
Fiscal Year 1997: ¥69,500,000 (Direct Cost: ¥69,500,000)
Fiscal Year 1996: ¥90,200,000 (Direct Cost: ¥90,200,000)
Fiscal Year 1995: ¥72,200,000 (Direct Cost: ¥72,200,000)
KeywordsCosmic Ray / Gamma Ray / Carenkov light / Air Fluorescence light / Super Nova / Active Galactic Nuclei / Telescope / 宇宙 / 超新星残骸 / 宇宙線起源 / 空気シャワー / 大気シンチレーション光 / カニ星雲 / レーザー
Research Abstract

The main purpose of this project is to investigate the origin of cosmic rays by measuring the highest energy cosmic rays and high energy gamma rays precisely. The Cerenkov light and Air fluorescence light from cosmic ray air showers can be measured by the Utah Seven Telescopes Array in optical method. The tracks of air showers is recorded by the telescopes of large diameter and their geometrical structures give us many informations, and the energy and arrival direction can be determined with high accuracy.
Since 1995, we have developped the telescope. Two telescopes were installed at Akeno Observatory in Japan and the fundamental performance was examined. The construction of seven telescopes array at Utah, USA was completed in 1998 after three years effort.
The significant results obtained from this Utah Seven Telescope Array are as follows. The high energy gamma rays from Crab Nebula, AGN Mrk421, Mrk501 and IES1959 were successfully observed. Especially, the in the observation of Mrk501, we have discovered the existence of the kink in the energy spectrum around 5-7 TeV andI the periodicity of 24days in the gamma ray intensities. The object IES1959 were identified as a TeV gamma ray sources by our observations. For the study of the highest energy cosmic rays, we have shoot the laser beam in the atmosphere and simulated the air showers. These images were observed by telescopes at a distance of 22km and the sensitivity for the highest energy cosmic rays by the Utah Seven Telescope Array were evaluated.

Report

(5 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] M.Teshima 他: "Observation of TeV gamma ray flares from Mrk501"Astro. Phys. J.Lett. 504,2. 71-74 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.teshima 他: "Extension of the Cosmic-Ray Energy Spectrum beyond GZK Cutoff"Phys. Rev. Lett. 81. 1163-1166 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.teshima 他: "A possible correlation of Most energetic cosmic rays・・・・・"Phys. Rev. Lett. 77. 1000-1003 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.teshima 他: "A Measurement of the Air Fluorescence Yield"Nucl. Instr. and Meth. A372. 527-533 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M. Teshima et al.: "Observations of TeV Gamma-Ray Flares from Markarian 501 with the Telescope Array Prototype"Astrophysical. J. Lett.. Vol501. 71-74 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M. Teshima et al.: "Extension of the Cosmic Ray Energy Spectrum beyond the Predicted Greisen-Zatsepin-Kuz'min Cutoff"Phys. Rev. Lett.. Vol 81, N6. 1163-1166 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M. Teshima et al.: "Possible Correlation of the Most Energetic Cosmic Rays within a Limited Space Angle Observed by the Akeno Giant Air Shower Array"Phys. Rev. Lett.. Vol77, N6. 1000-1003 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M. Teshima et al.: "A measurement of the air fluorescence yield"Nucl. Instr. And Meth. A372. 527-533 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Teshima 他: "Observation of TeV gamma ray flares from Mrk501" Astro.Phys.J.Lett.504,2. 71-74 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] H.Teshima 他: "Extension of the Cosmic-Ray Energy Spectrum beyond Gzk Cutoff" Phys.Rev.Lett.81. 1163-1166 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Teshima 他: "A Possible Correlation of Most Energetic Cosmic Rays……" Phys.Rev.Lett.77. 1000-1003 (1996)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Teshima 他: "A Measurement of the Air Fluorescence Yield" Nucl.Instr.and Meth.A372. 527-533 (1996)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Aiso, et al.: "Detection of TeV Gamma Rays from Crab using the Telescope Array Prototype" Proceedings of 25th International Cosmic Ray Conference(Durban),. 3. 177-180 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.Aiso, et al.: "TeV Gamma Rays from Markarian 421." Proceedings of 25th International Cosmic Ray Conference(Durban),. 3. 261-264 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.Aiso, et al.: "The Telescope Array Project." Proceedings of 25th International Cosmic Ray Conference(Durban),. 5. 373-376 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] N.Hayashida et al.: "A Possible Correlation of Most Energetic Cosmic Rays Observed by AGASA with Super galactic Structure," Phys.Rev.Lett.77. 1000-1003 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] F.Kakimoto et al.: "A Measurement of the Air Fluorescence Yield," Nucl.Instr.and Meth.A372. 527-533 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] N.Hayashida他: "A Possible Correlation of Most Energetic Cosmic Rays Observed by AGASA with Super galactic Structure," Phys.Rev.Lett.77. 1000-1003 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] F.Kakimoto,H.Nagano他: "A Measurement of the Air Fluorescence Yield," Nucl.Instr.and Meth. A372. 527-533 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] N.Hayashida他: "Muons(【product】1GeV)in large extensive air showers of energies between 10^<16.5>eV and 10^<19.5>eV observed at Akeno," J.Phys.G;Nucl.Part.Phys.21. 1101-1119 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] Hayashida et al.: "Muons(【greater than or equal】1GeV)in large extensive air showers of energies between 10^<16.5>eV and 10^<19.5>eV observed at Ak " J. Phys. G; Nucl. Part. Phys.21. 1101-1119 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Yoshida et al.: "The Cosmic Ray Energy Spectrum above 3×10^<18>eV by the Akeno Giant Air Shower Array" Astroparitcle Physics. 3. 105-123 (1994)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2019-02-15  

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