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Search of dark matter by microlensing observations

Research Project

Project/Area Number 08044066
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research Field 素粒子・核・宇宙線
Research InstitutionNagoya University

Principal Investigator

MURAKI Yasushi  Solar-Terrestrial Environment Laboratory, Nagoya University Professor, 太陽地球環境研究所, 教授 (70013430)

Co-Investigator(Kenkyū-buntansha) ヨック フィリップ  オークランド大学, 理学部, 教授
NAKAMURA Takashi  Faculty of Science, Kyoto University Professor, 理学部, 教授 (80155837)
ABE Fumio  Solar-Terrestrial Environment Laboratory, Nagoya University Associate Professor, 太陽地球環境研究所, 助教授 (80184224)
MATSUBARA Yutaka  Solar-Terrestrial Environment Laboratory, Nagoya University Associate Professor, 太陽地球環境研究所, 助教授 (80202323)
SEKIGUCHI Maki  Institute for Cosmic Ray Research, University of Tokyo Associate Professor, 宇宙線研究所, 助教授 (40216528)
YOCK Philip  Faculty of science, Auckland University Professor
フィリップ ヨック  オークランド大学, 理学部, 教授
ジョン ハーンショウ  カンタベリー大学, 理学部, 教授
斎藤 敏治  都立航空高等専門学校, 助教授 (40259833)
イアン ボンド  名古屋大学, 太陽地球環境研究所, COE研究員
小林 誠  高エネルギー物理学研究所, 物理研究部, 教授 (90025453)
佐藤 文隆  京都大学, 理学部, 教授 (90025370)
河辺 征次  高エネルギー物理学研究所, データ処理センター, 助教授 (10044786)
渡瀬 芳行  高エネルギー物理学研究所, データ処理センター, 教授 (70018662)
寿岳 潤  東海大学, 文明研究所, 教授 (50012795)
佐藤 修二  名古屋大学, 理学部, 教授 (50025483)
吉沢 正則  国立天文台, 位置天文天体力学研究系, 助教授 (20126197)
宮本 昌典  国立天文台, 位置天文天体力学研究系, 教授 (30012850)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥18,000,000 (Direct Cost: ¥18,000,000)
Fiscal Year 1997: ¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1996: ¥10,800,000 (Direct Cost: ¥10,800,000)
Keywordscosmic dark matter / mosaic ccd camera / Large Magellanic Cloud / galactic center / brown dwarf / global network / MACHO / extra-solar planet / CCDカメラ / ダ-クマタ- / Macho / MOA
Research Abstract

An extremly sensitive 'gravitational microlensing' technique, that was originally proposed by Einstein, is being used at the Mt.John University Observatory by a Japan/NZ collaboration MOA to carry out various fundamental measurements. The collaboration brings together resources and expertise from several NZ and Japanese institutions. Additional US and Australian expertise and resources are involved through MOA's participation in a world-wide network of southern observatories all using the microlensing technique. The network is known as GMAN.Both MOA and GMAN utilise Mt.John's competitive edge in terms of latitude and longitude for observations of the Magellanic Clouds. What we have discoverd are as follows :
1) The composition of the halo of the Galaxy is unknown. The MOA group has found that it is comprised of<10% of low-mass brown dwarf stars, consistent with other groups. In May 1998, observations will be made with new CCD camera and improved search technique.
2) Discovery-of an extra Jupitor in July 24th 1997. It has been confirmed that the microlensing technique has the required sensitivity for the detection of extra-solar planets. Round-the-clock observations were made by the GMAN network, and by another network known as PLANET,a possible example of planet was found. Again in May 1998, a much larger CCD camera with 24 million rather 9 million pixels will be used at Mt.John, and the data analysis will be carried out on-line. Statistically significant data on the frequency of stars with planetary systems similar to ours, potentially capable of supporting life, are expected to be discovered.
3) Detail structure of stellar atmosphere has been done. Using binary lensing event 97-28, a very detailed study of a distant star was made.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (29 results)

All Other

All Publications (29 results)

  • [Publications] Alcock,C., et al.: "Macho Alert 95-30:First Real-Time Observation of Extended Source Effects in Gravitational Microlensing" Astrophys.J.491. 436-450 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Becker,A., et al.: "Global Microlensing Alert Network" Bull.American Astron.Soc.191. 8305-8319 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nakamura,T., et al.: "Gravitational Waves from Coalescing Black Hole MACHO Binaries" Astrophys.J.487. L139-L142 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Chiba,T., et al.: "Cosmology with x-matter" Mon.Not.R.astr.soc.289. L5-L9 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 中村 卓史: "マッチョは宇宙のダ-クマタ-か?" 日本物理学会誌. 52. 843-847 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nakamura,T., et al.: "The Minimum Total Mass of MACHO's and Halo Models of the Galaxy" Astrophys.J.473. L99-L102 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Muraki, Y.: "Moa Project in New Zealand" Proc.2nd Int.Conf.on Gravitational Microlensing Surveys, Paris. 359-367 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kan-ya, Y., et al.: "Microlensing and Halo Models of the Galaxy" Publ.Astron.Soc.Japan. 48. 479-487 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Uehara, H., et al.: "Fragmentation of the Primordial Gas Clouds and the Lower Limit on the Mass of the First Stars" Astrophys.J.473. L95-L98 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nakamura, T., et al.: "The Minimum Total Mass of MACHO's and Halo Models of the Galaxy" Astrophys.J.473. L99-L102 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nakamura, T.: "Is MACHO Cosmic Dark Matter ?" Publ.Phys.Soc.Japan. 52. 843-847 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yock, P.C.M., and J.Hearnshaw: "The MOA Project" Sky and Space. 10. 6-14 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nakamura, T., et al.: "Gravitational Waves from Coalescing Black Hole" Astrophys.J.487. L139-L142 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Becler, A., et al.: "Global Microlensing Alert Network" Bull.American Astron.Soc.191. 8305-8319 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Alcock, C., et al.: "MACHO Alert 95-30 : First Real-Time Observation of Extended Source Effects in Gravitational Microlensing" Astrophys.J.491. 436-450 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Bond, I.A., et al.: "Search by MOA for Microlensing Events towards the Magellanic Clouds" Proc.4th Int.Conf.on Gravitational Microlensing, Paris. (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yock, P.C.M., et al.: "Future Plans for MOA" Proc.4th Int.Conf.on Gravitational Microlensing, Paris. (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Alcock, C., et al.: "Macho Alert 95-30:First Real-Time Observation of Extended Source Effects in Gravitational Microlensing" Astrophys.J.491. 436-450 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Becker, A., et al.: "Global Microlensing Alert Network" Bull.American Astron.Soc.191. 8305-8319 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Nakamura, T., et al.: "Gravitatiinal Waves from Coalescing Black Hole MACHO Binaries" Astrophys.J.487. L139-L142 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Chiba, T., et al.: "Cosmology with x-matter" Mon.Not.R.astr.soc.289. L5-L9 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 中村 卓史: "マッチョは宇宙のダ-クマタ-か?" 日本物理学会誌. 52. 843-847 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Nakamura, T., et al.: "The Minimum Total Mass of MACHO′s and Halo Models of the Galaxy" Astrophys.J.473. L99-L102 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] Alcock,C.,et al.: "Macho Alert 95-30" Astrophys.J.(印刷中). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Muraki,Y.: "Moa Project in New Zealand" Proc.of 2nd Int.Conf.on Gravitational Microlensing Surveys at Paris. 3. 359-367 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Yock,P.C.M.: "Variable Stars and the Astrophysical Returns of Microlensing Survey" Proc.of XIIth IAP Astrophysics Meeting,France. (印刷中). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Kanaya,Y.,et al.: "Microlensing and Halo Models of the Galaxy" Publ.Astron.Soc.Japan. 48. 479-487 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Uehara,H.,et al.: "Fragmentation of the Primordial Gas Clouds and the Lower Limit on the Mass of the First Stars" Astrophys.J.473. L95-L98 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Nakamura,T.,et al.: "The Minumum Total Mass of MACHOs and Halo Models of the Galaxy" Astrophys.J.473. L99-L102 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2018-02-02  

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