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2019 Fiscal Year Annual Research Report

New Developments in Research on Cosmic Reionization and Cosmic Magnetic Fields by Long Wave Length Radio Observations

Research Project

Project/Area Number 17H01110
Research InstitutionNagoya University

Principal Investigator

杉山 直  名古屋大学, 理学研究科, 教授 (70222057)

Co-Investigator(Kenkyū-buntansha) 市來 淨與  名古屋大学, 理学研究科, 准教授 (10534480)
田代 寛之  名古屋大学, 理学研究科, 特任准教授 (40437190)
大内 正己  東京大学, 宇宙線研究所, 教授 (40595716)
赤堀 卓也  国立天文台, 水沢VLBI観測所, 特任研究員 (70455913)
高橋 慶太郎  熊本大学, 大学院先端科学研究部(理), 准教授 (80547547)
竹内 努  名古屋大学, 理学研究科, 准教授 (90436072)
Project Period (FY) 2017-04-01 – 2020-03-31
Keywords宇宙再電離 / 宇宙磁場
Outline of Annual Research Achievements

オーストラリアの低周波電波望遠鏡MWAで観測を行い、宇宙再電離期の中性水素に関する研究を行なった。特に、低周波電波観測における較正や前景放射の特性を調べ、系統誤差の評価を行なって、中性水素の21cm線シグナルに対する上限を得た。さらに、ライマンα輝線天体(LAE)との相互相関による中性水素21cmシグナルの観測可能性を数値シミュレーションを駆使して評価した。
次に明るい背景電波光源のスペクトルに前景にある中性水素雲が吸収線を作ることで生じる21cm forestの将来の観測を想定し、暗黒物質の性質に対する制限の改善がどれ程期待できるか解析を行った。質量の軽いスカラー場(Axion-like partile)が暗黒物質であるシナリオ、および始原ブラックホールが暗黒物質であるモデルを解析し、通常の銀河サーベイでは感度のない質量域まで探索可能であることを示した。また様々な暗黒物質シナリオでの暗黒物質の性質が宇宙再電離に与える影響を調べた。これにより宇宙再電離期を探査可能なCMB観測や将来の21cm線観測による暗黒物質の性質の解明の研究をおこない、特に将来の再電離期からの21cm線シグナルの観測は暗黒物質の正体解明に大きく寄与する可能性があることを明らかにした。
宇宙磁場に関する研究として、銀河団Abell 3376を南アフリカの電波望遠鏡MeerKATを用いて低周波電波観測し、銀河団の磁場により屈曲する活動銀河核ジェットの様子を捉える画期的な成果を得た。
最終年度からコロナ禍での繰越を行って研究を継続し、昨年度までに関連する学術論文を合計23編出版するに至った。

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。

  • Research Products

    (37 results)

All 2021 2020 2019

All Journal Article (23 results) (of which Int'l Joint Research: 17 results,  Peer Reviewed: 23 results) Presentation (14 results) (of which Int'l Joint Research: 10 results,  Invited: 12 results)

  • [Journal Article] SILVERRUSH X: Machine Learning-aided Selection of 9318 LAEs at z = 2.2, 3.3, 4.9, 5.7, 6.6, and 7.0 from the HSC SSP and CHORUS Survey Data2021

    • Author(s)
      Ono, Yoshiaki; Itoh, Ryohei; Shibuya, Takatoshi; Ouchi, Masami et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 911 Pages: 78-97

    • DOI

      10.3847/1538-4357/abea15

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] SILVERRUSH. IX. Lyα Intensity Mapping with Star-forming Galaxies at z = 5.7 and 6.6: A Possible Detection of Extended Lyα Emission at ?100 Comoving Kiloparsecs around and beyond the Virial-radius Scale of Galaxy Dark Matter Halos2021

    • Author(s)
      Kakuma, Ryota; Ouchi, Masami et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 916 Pages: 22-30

    • DOI

      10.3847/1538-4357/ac0725

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A new MWA limit on the 21 cm power spectrum at redshifts 13-172021

    • Author(s)
      Yoshiura, S. ; Pindor, B. ; Line, J. L. B., et al.,
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 505 Pages: 4775-4790

    • DOI

      10.1093/mnras/stab1560

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Constraining the 21 cm brightness temperature of the IGM at z = 6.6 around LAEs with the murchison widefield array2021

    • Author(s)
      Trott, C. M. ; Jordan, C. H. ; Line, J. L. B., et al.,
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 507 Pages: 772-780

    • DOI

      10.1093/mnras/stab2235

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Evidence of an interaction between jets and intra-cluster magnetic layer2021

    • Author(s)
      J. O. Chibueze, H. Sakemi, T. Ohmura, M. Machida, H. Akamatsu, T. Akahori, H. Nakanishi, V. Parekh, R. van Rooyen, T. and T. Takeuchi, 2021
    • Journal Title

      Nature

      Volume: 593 Pages: 47-50

    • DOI

      10.1038/s41586-021-03434-1

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Probing axion dark matter with 21 cm fluctuations from minihalos2021

    • Author(s)
      Kadota, Kenji ; Sekiguchi, Toyokazu ; Tashiro, Hiroyuki
    • Journal Title

      Physical Review D

      Volume: 103 Pages: id.023521

    • DOI

      10.1103/PhysRevD.103.023521

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Population III star explosions and Planck 2018 data2021

    • Author(s)
      Abe, Katsuya T. ; Tashiro, Hiroyuki
    • Journal Title

      Physical Review D

      Volume: 103 Pages: id.123543

    • DOI

      10.1103/PhysRevD.103.123543

    • Peer Reviewed
  • [Journal Article] CMB and 21-cm bounds on early structure formation boosted by primordial black hole entropy fluctuations2021

    • Author(s)
      Tashiro, Hiroyuki ; Kadota, Kenji
    • Journal Title

      Physical Review D

      Volume: 104 Pages: id.063522

    • DOI

      10.1103/PhysRevD.104.063522

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Small-scale CMB anisotropies induced by the primordial magnetic fields2021

    • Author(s)
      Minoda, Teppei ; Ichiki, Kiyotomo ; Tashiro, Hiroyuki
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2021-03 Pages: id.093

    • DOI

      10.1088/1475-7516/2021/03/093

    • Peer Reviewed
  • [Journal Article] Early Low-mass Galaxies and Star-cluster Candidates at z ? 6-9 Identified by the Gravitational-lensing Technique and Deep Optical/Near-infrared Imaging2020

    • Author(s)
      Kikuchihara, Shotaro; Ouchi, Masami et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 893 Pages: 60-72

    • DOI

      10.3847/1538-4357/ab7dbe

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] CHORUS. I. Cosmic HydrOgen Reionization Unveiled with Subaru: Overview2020

    • Author(s)
      Inoue, Akio; Yamanaka, Satoshi; Ouchi, Masami et al.
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 72 Pages: 101(1-17)

    • DOI

      10.1093/pasj/psaa100

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Deep multiredshift limits on Epoch of Reionization 21 cm power spectra from four seasons of Murchison Widefield Array observations2020

    • Author(s)
      Trott, Cathryn M. ; Jordan, C. H. ; Midgley, S., et al.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 493 Pages: 4711-4727

    • DOI

      10.1093/mnras/staa414

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Detectability of 21-cm signal during the epoch of reionization with 21-cm-Lyman-α emitter cross-correlation - III. Model dependence2020

    • Author(s)
      Kubota, Kenji ; Inoue, Akio K. ; Hasegawa, Kenji ; Takahashi, Keitaro
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 494 Pages: 3131-3140

    • DOI

      10.1093/mnras/staa979

    • Peer Reviewed
  • [Journal Article] The impact of tandem redundant/sky-based calibration in MWA Phase II data analysis2020

    • Author(s)
      Zhang, Zheng ; Pober, Jonathan C. ; Li, Wenyang, et al.,
    • Journal Title

      Publications of the Astronomical Society of Australia

      Volume: 37 Pages: e045

    • DOI

      10.1017/pasa.2020.37

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] An Iterative Reconstruction Algorithm for Faraday Tomography2020

    • Author(s)
      S. Cooray, T. T. Takeuchi, T. Akahori, Y. Miyashita, S. Ideguchi, K. Takahashi, K. Ichiki
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 500 Pages: 5129-5141

    • DOI

      10.1093/mnras/staa3580

    • Peer Reviewed
  • [Journal Article] The 21-cm signals from ultracompact minihaloes as a probe of primordial small-scale fluctuations2020

    • Author(s)
      Furugori, Kunihiko ; Abe, Katsuya T. ; Tanaka, Toshiyuki ; Hashimoto, Daiki ; Tashiro, Hiroyuki ; Hasegawa, Kenji
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 494 Pages: 4334-4342

    • DOI

      10.1093/mnras/staa1033

    • Peer Reviewed
  • [Journal Article] Constraining mixed dark-matter scenarios of WIMPs and primordial black holes from CMB and 21-cm observations2020

    • Author(s)
      Tashiro, Hiroyuki ; Kadota, Kenji
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 494 Pages: 4334-4342

    • DOI

      10.1093/mnras/staa1033

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] SILVERRUSH. VIII. Spectroscopic Identifications of Early Large-scale Structures with Protoclusters over 200 Mpc at z ? 6-7: Strong Associations of Dusty Star-forming Galaxies2019

    • Author(s)
      Harikane, Yuichi; Ouchi Masami et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 883 Pages: 142-157

    • DOI

      10.3847/1538-4357/ab2cd5

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Robust statistics towards detection of the 21 cm signal from the Epoch of Reionization2019

    • Author(s)
      Trott, Cathryn M. ; Fu, Shih Ching ; Murray, S. G., et al.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 486 Pages: 5766-5784

    • DOI

      10.1093/mnras/stz1207

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Gridded and direct Epoch of Reionisation bispectrum estimates using the Murchison Widefield Array2019

    • Author(s)
      Trott, Cathryn M. ; Watkinson, Catherine A. ; Jordan, Christopher H., et al.
    • Journal Title

      Publications of the Astronomical Society of Australia

      Volume: 36 Pages: e23

    • DOI

      10.1017/pasa.2019.15

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] First Season MWA Phase II Epoch of Reionization Power Spectrum Results at Redshift 72019

    • Author(s)
      Li, W. ; Pober, J. C. ; Barry, N., et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 887 Pages: 141

    • DOI

      10.3847/1538-4357/ab55e4

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Study of systematics effects on the cross power spectrum of 21 cm line and cosmic microwave background using Murchison Widefield Array data2019

    • Author(s)
      Yoshiura, S. ; Ichiki, K. ; Pindor, B. ; Takahashi, K. ; Tashiro, H. ; Trott, C. M.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 483 Pages: 2697-2711

    • DOI

      10.1093/mnras/sty3248

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Insight into primordial magnetic fields from 21-cm line observation with EDGES experiment2019

    • Author(s)
      Minoda, Teppei ; Tashiro, Hiroyuki ; Takahashi, Tomo
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 488 Pages: 2001-2005

    • DOI

      10.1093/mnras/stz1860

    • Peer Reviewed
  • [Presentation] 銀河団偏光と宇宙マイクロ波背景輻射四重極揺らぎを用いた暗黒エネルギーの新しい検証法2021

    • Author(s)
      市來淨與
    • Organizer
      立教大学コロキウム
    • Invited
  • [Presentation] 宇宙マイクロ波背景輻射観測2021

    • Author(s)
      市來淨與
    • Organizer
      天文観測におけるビッグデータ解析と宇宙論パラメータの推定
    • Invited
  • [Presentation] 21cm forest constraints on primordial black holes2021

    • Author(s)
      市來淨與
    • Organizer
      Brain-storming workshop on Primordial Black Holes and Gravitational Waves
    • Int'l Joint Research / Invited
  • [Presentation] The Epoch of Reionization and the Square Kilometre Array2021

    • Author(s)
      市來淨與
    • Organizer
      第4回 CMB JSPS研究拠点形成事業・国内交流若手セミナー
    • Int'l Joint Research / Invited
  • [Presentation] Emission Lines in Galaxies _x000B_from the Epoch of Reionization to Today2021

    • Author(s)
      大内正己
    • Organizer
      238th Meeting of the American Astronomical Society
    • Int'l Joint Research / Invited
  • [Presentation] Multi-Object Spectroscopy Galaxy Surveys: _x000B_Bridging Past, Present, and Future2021

    • Author(s)
      大内正己
    • Organizer
      STScI Workshop 2021
    • Int'l Joint Research / Invited
  • [Presentation] IGM theory Dark Age, Cosmic Dawn, & Epoch of Reionization2021

    • Author(s)
      高橋慶太郎
    • Organizer
      Galaxy-IGM workshop 2021
    • Int'l Joint Research / Invited
  • [Presentation] Exploring Magnetized Cosmic Web using RM grids2021

    • Author(s)
      赤堀卓也
    • Organizer
      LOFAR MKSP Annual meeting and Busy Days 2020
    • Int'l Joint Research / Invited
  • [Presentation] Linearly-Polarized FRB as a tool of exploring cosmic magnetism2021

    • Author(s)
      赤堀卓也
    • Organizer
      YITP International Molecule-type Workshop: Fast Radio Bursts: A Mystery Being Solved?
    • Int'l Joint Research
  • [Presentation] Linearly-Polarized FRB: Challenge to Discover Magnetized Cosmic Web2021

    • Author(s)
      赤堀卓也
    • Organizer
      IAU Symposium 260 Astronomical Polarimetry 2020
    • Int'l Joint Research
  • [Presentation] Early Galaxy ISM, CGM, and IGM Probed with ALMA, Subaru, and Keck2020

    • Author(s)
      大内正己
    • Organizer
      Sesto workshop 2020: The Interstellar medium of high redshift galaxies
    • Int'l Joint Research / Invited
  • [Presentation] 銀河観測研究における新展開2020

    • Author(s)
      大内正己
    • Organizer
      理論懇シンポジウム2020
    • Invited
  • [Presentation] Exploring early galaxies and cosmic structures with Subaru, HST, and ALMA2019

    • Author(s)
      大内正己
    • Organizer
      Cambridge KICC 10th Anniversary Symposium
    • Int'l Joint Research / Invited
  • [Presentation] SKAとすばる広領域観測で探る_x000B_宇宙再電離と銀河形成2019

    • Author(s)
      大内正己
    • Organizer
      SKA-Japan シンポジウム
    • Invited

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Published: 2022-12-28  

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