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偏波スペクトル解析を用いた宇宙磁場の解明

Research Project

Project/Area Number 17J06936
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section国内
Research Field Astronomy
Research InstitutionKumamoto University

Principal Investigator

宮下 恭光  熊本大学, 自然科学研究科, 特別研究員(DC1)

Project Period (FY) 2017-04-26 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2019: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2018: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2017: ¥1,000,000 (Direct Cost: ¥1,000,000)
Keywords宇宙磁場 / 偏光 / データ解析
Outline of Annual Research Achievements

①ASKAPでの活動
ASKAPにはPOSSUMと呼ばれる天体から放射される偏波を観測して天体の磁場を調べる観測グループが存在する。ASKAPでは36台の全アンテナを用いたサーベイ観測が2019年にスタートし、現在グループのメンバーで協力して観測データのクオリティチェックを行っている。私はその中でもモザイキングという36個それぞれのビームから得られる偏波画像を合成するプロセスの検証を担当している。9月に行われた国際会議では、超新星残骸領域のデータを用いたその成果報告を行った。今後はPOSSUM全体でサーベイ観測でのサイエンスをまとめた論文を執筆し、私も著者の一人として執筆していく予定である。
②LOFARでの活動
LOFARにはMKSPと呼ばれる系外・系内の銀河磁場を調査するプロジェクトが存在する。私は昨年から低周波(100MHz以下)偏波での系外銀河カタログを作成する研究を行っている。一般的に低周波帯での偏波観測は偏波解消などの影響によりかなり難しく、観測された偏波源の数は数百と非常に少ない。さらに、検出できたとしても望遠鏡由来の人口的な偏波が混入する場合がある。私は、この望遠鏡由来の人口的な偏波に関する系統的な調査を行い、9月に行われた国際会議にてその成果を報告した。今後は、サーベイ観測のデータを用いて低周波での系外銀河の磁場強度マップを作成していく予定である。
③3次元円盤銀河シミュレーション
実空間とRM空間において磁場の強度や方向にどのような相関関係があるか調べるために、一様なリング磁場・ガス密度分布を持つ簡単な3次元銀河モデルを作成し、3次元のFDFを数値的に計算した。また、実空間における磁場の強度や方向を系統的に変化させながら、FDFがこれらの情報をどのように反映しているか定量的なシミュレーションを行った。これらの研究は論文にまとめており、執筆はほぼ完了している。

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

Report

(3 results)
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (25 results)

All 2019 2018 2017 Other

All Int'l Joint Research (6 results) Journal Article (5 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 5 results,  Open Access: 5 results) Presentation (14 results) (of which Int'l Joint Research: 11 results,  Invited: 2 results)

  • [Int'l Joint Research] CSIRO(オーストラリア)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] The University of Toronto(カナダ)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] University of Hamburg(ドイツ)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Radboud University Nijmegen(オランダ)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] CSIRO/ICRAR(オーストラリア)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] ICRAR/MWA(オーストラリア)

    • Related Report
      2017 Annual Research Report
  • [Journal Article] Performance test of QU-fitting2019

    • Author(s)
      Yoshimitsu Miyashita
    • Journal Title

      galaxies

      Volume: 7 Issue: 3 Pages: 69-69

    • DOI

      10.3390/galaxies7030069

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Performance test of QU-fitting in cosmic magnetism study2018

    • Author(s)
      Miyashita Yoshimitsu、Ideguchi Shinsuke、Nakagawa Shouta、Akahori Takuya、Takahashi Keitaro
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 482 Issue: 2 Pages: 2739-2749

    • DOI

      10.1093/mnras/sty2862

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Faraday Tomography Tutorial2018

    • Author(s)
      Shinsuke Ideguchi, Yoshimitsu Miyashita, George Heald
    • Journal Title

      galaxies

      Volume: 6 Issue: 4 Pages: 140-140

    • DOI

      10.3390/galaxies6040140

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Faraday Tomography of the SS433 Jet Termination Region2018

    • Author(s)
      Sakemi Haruka、Machida Mami、Ohmura Takumi、Ideguchi Shinsuke、Miyashita Yoshimitsu、Takahashi Keitaro、Akahori Takuya、Akamatsu Hiroki、Nakanishi Hiroyuki、Kurahara Kohei、Farnes Jamie
    • Journal Title

      Galaxies

      Volume: 6 Issue: 4 Pages: 137-137

    • DOI

      10.3390/galaxies6040137

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Cosmic magnetism in centimeter- and meter-wavelength radio astronomy2017

    • Author(s)
      Akahori Takuya、Nakanishi Hiroyuki、Sofue Yoshiaki、Fujita Yutaka、Ichiki Kiyotomo、Ideguchi Shinsuke、Kameya Osamu、Kudoh Takahiro、Kudoh Yuki、Machida Mami、Miyashita Yoshimitsu、Ohno Hiroshi、Ozawa Takeaki、Takahashi Keitaro、Takizawa Motokazu、Yamazaki Dai G
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 70 Issue: 1 Pages: 1-44

    • DOI

      10.1093/pasj/psx123

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Faraday dispersion function of disk galaxies with axisymmetric global magnetic fields2019

    • Author(s)
      Yoshimitsu Miyashita
    • Organizer
      The 14th International Student Conference on Advanced Science and Technology (ICAST) 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Faraday tomography2019

    • Author(s)
      Yoshimitsu Miyashita
    • Organizer
      日本SKAサイエンス会議「宇宙磁場」2019
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Faraday tomography of radio galaxies at low frequency2019

    • Author(s)
      Yoshimitsu Miyashita
    • Organizer
      LOFAR MKSP Annual Meeting and Busy Days
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The Investigation of the SN1006 Field2019

    • Author(s)
      Yoshimitsu Miyashita
    • Organizer
      The "Polarisation Sky Survey of the Universe's Magnetism" (POSSUM) Busy Week VI
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] LOFARのサーベイデータを用いたFaraday tomography2019

    • Author(s)
      Yoshimitsu Miyashita
    • Organizer
      SKA-Japan シンポジウム 2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] Faraday dispersion function of disk galaxies with axisymmetric global magnetic fields II 3D structure2019

    • Author(s)
      Yoshimitsu Miyashita
    • Organizer
      New Perspectives on Galactic Magnetism
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Sparse reconstruction using total squared variation of polarimetric observations at low frequency2018

    • Author(s)
      Yoshimitsu Miyashita
    • Organizer
      Magnetism Key Science Project 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Performance test of QU-fit in cosmic magnetism study2018

    • Author(s)
      Yoshimitsu Miyashita
    • Organizer
      THE POWER OF FARADAY TOMOGRAPHY - TOWARDS 3D MAPPING OF COSMIC MAGNETIC FIELDS
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Tomography Tutorial -QU-fit part2018

    • Author(s)
      Yoshimitsu Miyashita
    • Organizer
      THE POWER OF FARADAY TOMOGRAPHY - TOWARDS 3D MAPPING OF COSMIC MAGNETIC FIELDS
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Application of sparse modeling to cosmic magnetism study2017

    • Author(s)
      Yoshimitsu Miyashita
    • Organizer
      4th International Symposium on Kumamoto Synchrotron Radiation
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Performance test of QU-fitting in cosmic magnetism study2017

    • Author(s)
      Yoshimitsu Miyashita
    • Organizer
      The Broad Impact of Low Frequency Observing
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] スパースモデリングを用いた銀河磁場解析2017

    • Author(s)
      宮下恭光
    • Organizer
      日本天文学会2017秋季年会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Simulation test of sparse modeling in cosmic magnetism study2017

    • Author(s)
      Yoshimitsu Miyashita
    • Organizer
      5th International Symposium on Kumamoto Synchrotron Radiation
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Application of sparse reconstruction to cosmic magnetism study at low frequencies2017

    • Author(s)
      Yoshimitsu Miyashita
    • Organizer
      Science at Low Frequencies IV
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research

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Published: 2017-05-25   Modified: 2024-03-26  

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