Constraints on the nature of cosmic acceleration and neutrino mass through the number count of high-redsfhit galaxy clusters

• Project/Area Number: 18K13561
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
• Research Institution: Nagoya University
• Principal Investigator: Miyatake Hironao 名古屋大学, 高等研究院(理), 特任助教 (20784937)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Discontinued (Fiscal Year 2020)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 観測的宇宙論 / 銀河団 / 多波長観測 / 宇宙論 / ニュートリノ / 重力レンズ / 光赤外天文学 / 赤外天文学 / 画像処理

Outline of Final Research Achievements

We were able to improve the accuracy of redshift determination of distant galaxies at approximately 10 billion years ago by combining optical imaging data from Subaru Hyper Suprime-Cam and infrared imaging data from Spitzer Space Telescope. Cluster finding based on the galaxy sample and cosmological constraints from cluster abundance are inherited by a successive research grant.

Academic Significance and Societal Importance of the Research Achievements

宇宙の大規模構造を用いた宇宙の加速膨張史の測定のうち、現在から約80億光年前までの観測データを用いたものは数多く行われてきたが、それより遠方の宇宙ではほとんどなされていない。本研究成果は、遠方銀河の赤方偏移推定を改善することにより、遠方宇宙での銀河団の検出を可能にし、さらにその銀河団を用いて宇宙の加速膨張史の測定を可能にするものである。

Research Products

• [Int'l Joint Research] California Institute of Technology/Center for Computational Astrophysics/Princeton University(米国)
• [Int'l Joint Research] University of KwaZulu-Natal(南アフリカ)
• [Int'l Joint Research] University of Toronto(カナダ)
• [Int'l Joint Research] Cardiff University/University of Cambridge/University of Oxford(英国)
• [Int'l Joint Research] Pontificia Universidad Catlica de Chile(チリ)
• [Int'l Joint Research]
• [Int'l Joint Research] California Institute of Technology(米国)
• [Journal Article] Weak-lensing Mass Calibration of ACTPol Sunyaev-Zel'dovich Clusters with the Hyper Suprime-Cam Survey (2019)
  • Author(s): Miyatake Hironao、Battaglia Nicholas、Hilton Matt et al.
  • Journal Title: The Astrophysical Journal Volume: 875 Issue: 1 Pages: 63-63
  • DOI: 10.3847/1538-4357/ab0af0
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Unveiling the Dark Sector of the Universe with Subaru Hyper Suprime-Cam (2019)
  • Author(s): Hironao Miyatake
  • Organizer: Future Perspective in Cosmology and Gravity
  • Int'l Joint Research / Invited
• [Presentation] Weak Lensing Cosmology from Subaru Hyper Supreme-cam First Year Data (2019)
  • Author(s): Hironao Miyatake
  • Organizer: 6th Korea-Japan workshop on dark energy at KMI
  • Int'l Joint Research / Invited
• [Presentation] Weak Lensing Cosmology from the Subaru Hyper Suprime-Cam Survey First Year Data (2019)
  • Author(s): 宮武広直
  • Organizer: セミナー(千葉大学)
• [Presentation] Weak Lensing Cosmology from the Subaru Hyper Suprime-Cam Survey First Year Data (2019)
  • Author(s): 宮武広直
  • Organizer: セミナー(京都大学)
• [Presentation] Hyper Suprime-Cam Weak Lensing Measurement of Galaxy Clusters Selected by Atacama Cosmology Telescope (2019)
  • Author(s): Hironao Miyatake
  • Organizer: Panchromatic Panoramic Studies of Galaxy Clusters
  • Int'l Joint Research