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Search for halos of ultra high-energy cosmic rays with X-ray and gamma-ray observations

Research Project

Project/Area Number 20K22356
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0203:Particle-, nuclear-, astro-physics, and related fields
Research InstitutionKanagawa University (2022)
Institute of Physical and Chemical Research (2020-2021)

Principal Investigator

Tsuji Naomi  神奈川大学, 理学部, 特別助教 (50878444)

Project Period (FY) 2020-09-11 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords宇宙線 / ガンマ線観測 / X線観測 / 最高エネルギー宇宙線
Outline of Research at the Start

10の18乗電子ボルトものエネルギーを持つ最高エネルギー宇宙線の起源は、未だ解明されていない。最高エネルギー宇宙線は宇宙背景放射と相互作用することで、天体の周囲にハローと呼ばれる電子陽電子のプールが形成される。本研究ではガンマ線観測とX線観測を組み合わせ、最高エネルギー宇宙線由来のハローを探査し、起源解明に迫る。

Outline of Final Research Achievements

Ultra high energy cosmic rays (UHECRs) interact with CMB (cosmic microwave background), forming a pool of electrons and positrons, referred to as halo, around sources. This work aims at searching for the halos induced by UHECRs through gamma-ray and X-ray observations in order to understand the mechanism of UHECRs. I obtained analysis method of TeV gamma-ray observational data taken by HESS (The High Energy Spectroscopic System). A few active galactic nuclei and star burst galaxies, which are considered to be suitable for this study, were selected and analyzed in the TeV gamma-ray and X-ray bands. Unfortunately, there was no significant signal of the halos. I also contributed to evaluation and improvement on performances of analysis software of HESS.

Academic Significance and Societal Importance of the Research Achievements

UHECRの観測的研究は、地上望遠鏡による直接観測によって発展を遂げ、近年ではIceCubeによるニュートリノ観測も加わり、UHECRの起源にはより一層注目が集まっている。そこで、電磁波観測から間接的にUHECRの兆候が捉えられれば、宇宙線観測や理論研究といった多岐に渡る分野に大きなインパクトをもたらすことができる。今回は残念ながら検出には至らなかったが、本研究で確立したデータ解析方法は、チェレンコフ望遠鏡CTAなどに適応可能である。CTAは既に一号機の運用がスタートしており、近い将来、より空間分解能の高い観測データが取得されるため、本研究はUHECRの分野における将来に先駆けた研究となった。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (7 results)

All 2023 2022 2021 Other

All Int'l Joint Research (3 results) Presentation (4 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] Max-Planck-Institut fur Kernphysik/DESY(ドイツ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Max-Planck-Institut fur Kernphysik/DESY(ドイツ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Max-Planck-Institut fur Kernphysik/DESY(ドイツ)

    • Related Report
      2020 Research-status Report
  • [Presentation] PeVatron候補天体HESS J1641-463のX線観測2023

    • Author(s)
      辻直美
    • Organizer
      日本天文学会2023年春季年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] The origin of MeV gamma-ray diffuse emission from the inner Galactic region2022

    • Author(s)
      辻直美
    • Organizer
      7th International Symposium on High Energy Gamma-ray Astronomy (Gamma 2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 大質量星団W43/HESS J1848-018の多波長観測2022

    • Author(s)
      辻直美
    • Organizer
      日本物理学会
    • Related Report
      2021 Research-status Report
  • [Presentation] HESS J1848-018/W43領域の多波長観測2021

    • Author(s)
      辻直美
    • Organizer
      日本天文学会
    • Related Report
      2021 Research-status Report

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Published: 2020-09-29   Modified: 2024-01-30  

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