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1991 Fiscal Year Final Research Report Summary

A Study of Neutral Particles from Cygnus X-3 above 10^<18>eV

Research Project

Project/Area Number 02452021
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 核・宇宙線・素粒子
Research InstitutionInstitute for Cosmic Ray Research, University of Tokyo.

Principal Investigator

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

Co-Investigator(Kenkyū-buntansha) HAYASHIDA Naoaki  ICRR,Univ.of Tokyo ; Assistant, 宇宙線研究所, 助手 (50114616)
NAGANO Motohiko  ICRR,Univ.of Tokyo ; Professor, 宇宙線研究所, 教授 (00013384)
Project Period (FY) 1990 – 1991
KeywordsCosmic Ray / Cygnus X-3 / Gamma Ray / Neutral Particles / Air Shower
Research Abstract

The Akeno Giant Air Shower Array (AGASA), covering 100km^2 area, has been in operation since 1990. This new array has accumulated more events than the number observed with the 20km^2 which has been in operation for over 5 years. Analysis of the data up through Nov 1991 to lood for excess in the direction of Cygnus X-3 shows 1 month that has a 4sigma excess number of events, occuring right after the strong radio burst of Jan 1991. No other time period shows a significant excess. The cummulative data set of AGASA shows a 2.5sigma excess in the direction of Cygnus X-3, still lower than necessary to make a strong claim for source emission. More data will be needed to clarify the characteristics of neutral emission from Cygnus X-3.
We have improved the experiment in several ways to enhance sensitivity to neutral source emission. Installation of a detector calibration system gives us better rise time and gain certainty. The threshold energy of detectable showers has been decreased down to 10^<17>eV and the resulting trigger rate is lower (-0.1Hz). A new workstation in the central laboratory collects and writes the data to Magnetic Optical disks. These on-line systems are monitored and controlled from our Institute in Tokyo using telecommunications. Improvements have been made on analysis which have been used to measure the directional excess, test for periodicity, and search for bursts.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] M.Nagano et al.: "Energy Spectrum of Primary Cosmic Rays above 10^<17>eV Observed at Akeno" Journal of Physics G:Nucl.Part.Phys.18. 423-442 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Chiba et al.: "Akeno Giant Air Shower Array(AGASA)covering 100km^2 area" Nuclear Instrument &Methods. A311. 338-349 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Teshima: "Experimental Results obtained from The Akeno Giant Air Shower Array" Astrophysical Aspects of The Most Energetic Cosmic Rays. (Published by World Scientific);. 49-60 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Nagano: "A New 100km^2 Air Shower Array at Akeno(AGASA)" Astrophysical Aspects of The Most Energetic Cosmic Rays. (Published by World Scientific);. 335-344 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Hayashida et al.: "A Search for Point Sources above 10^<17>eV using Data from the Akeno Giant Air Shower Array" Proc.of 22nd International Cosmic Ray Conference(Dublin). 1. 309-312 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Hayashida et al.: "Arrival Direction of Cosmic Rays above 10^<17>eV" Proc. of 22nd International Cosmic Ray Conference(Dublin). 2. 117-120 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Nagano et al.: "Energy Spectrum of Primary Cosmic Rays above 10^<17>eV Observed at Akeno" Journal of Physics G : Nucl.Part.Phys.18. 423-442 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Chiba et al.: "Akeno Giant Air Shower Array (AGASA) covering 100km^2 area" Nuclear Instrument & Methods. A311. 338-349 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Hayashida et al.: "A Search for Point Sources above 10^<17>eV using Data from the Akeno Giant Air Shower Array" Proc.of 22nd International Cosmic Ray Conference (Dublin). Vol.1. 309-312 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Hayashida et al.: "Arrival Direction of Cosmic Rays above 10^<17>eV" Proc.of 22nd International Cosmic Ray Conference (Dublin). Vol.2. 117-120 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Teshima: "Experimental Results obtained from The Akeno Giant Air Shower Array" Astrophysical Aspects of The Most Energetic Cosmic Rays (Published by World Scientific). 49-60 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Nagano: "A New 100km^2 Air Shower Array at Akeno (AGASA)" Astrophysical Aspects of The Most Energetic Cosmic Rays (Published by World Scientific). 335-344 (1990)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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