Probing the formation of first galaxies under radiative feedback

• Project/Area Number: 15H06022
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Astronomy
• Research Institution: Tohoku University
• Principal Investigator: Yajima Hidenobu 東北大学, 学際科学フロンティア研究所, 助教 (10756357)
• Project Period (FY): 2015-08-28 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 銀河形成 / 巨大ブラックホール / 輻射輸送 / 星間ダスト / 数値シミュレーション / 初期宇宙の銀河進化 / 銀河進化におけるフィードバックの効果 / 遠方銀河の輻射特性 / 天文 / 銀河形態 / サブミリ銀河 / 宇宙論的流体計算 / 星団形成

Outline of Final Research Achievements

We have performed large-scale numerical simulations and multi-wavelength radiation transfer calculations. Our simulations show evolution from first galaxies to massive galaxies, and their observational properties. Large amounts of gas accrete onto galaxies, and make massive galactic disks in an over-dense region. The massive galaxies become bright at infrared band due to dust thermal emission in the galactic disk. We also derive the conditions for formations of Population III star clusters and massive black holes in first galaxies by using analytical models.

Research Products

• [Int'l Joint Research] エディンバラ大学(英国)
• [Journal Article] Upper limits on the mass and luminosity of Population III-dominated galaxies (2017)
  • Author(s): Hidenobu Yajima, Sadegh Khochfar
  • Journal Title: Monthly Notices of the Royal Astronomical Society Letter Volume: 467 Issue: 1 Pages: 51-55
  • DOI: 10.1093/mnrasl/slw249
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Rapid Black Hole Growth under Anisotropic Radiation Feedback (2017)
  • Author(s): Kazuyuki Sugimura, Takashi Hosokawa, Hidenobu Yajima, Kazuyuki Omukai
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 印刷中
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] The role of stellar relaxation in the formation and evolution of the first massive black holes (2016)
  • Author(s): Hidenobu Yajima, Sadegh Khochfar
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 457 Issue: 3 Pages: 2423-2432
  • DOI: 10.1093/mnras/stw058
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Observational properties of simulated galaxies in overdense and average regions at redshifts z ~ 6-12 (2015)
  • Author(s): Hidenobu Yajima, Isaac Schlosman, Emilio Romano-Diaz, Kentaro Nagamine
  • Journal Title: Monthly Notice of the Royal Astronomical Society Volume: 451 Issue: 1 Pages: 418-432
  • DOI: 10.1093/mnras/stv974
  • Peer Reviewed / Int'l Joint Research
• [Presentation] 銀河形成シミュレーションにおけるガス・星形成・フィードバックの物理 (2017)
  • Author(s): 矢島 秀伸
  • Organizer: 第４回銀河進化研究会
  • Place of Presentation: 大阪大学理学部教育研究交流棟（大阪府、豊中市）
  • Year and Date: 2017-06-07
  • Invited
• [Presentation] Cosmological simulation of high-redshift galaxies in the epoch of reionization (2016)
  • Author(s): 矢島 秀伸
  • Organizer: Ultimate-Subaru Science Workshop 2016
  • Place of Presentation: 国立天文台三鷹キャンパスすばる棟（東京都、三鷹市）
  • Year and Date: 2016-06-16
  • Int'l Joint Research / Invited
• [Presentation] 数値シミュレーションで探る初代銀河形成過程 (2016)
  • Author(s): 矢島 秀伸
  • Organizer: 第３回銀河進化研究会
  • Place of Presentation: 東北大学青葉山キャンパス合同C棟（宮城県、仙台市）
  • Year and Date: 2016-06-01
• [Presentation] 超新星爆発の影響下における初代銀河の進化と星形成史 (2016)
  • Author(s): 矢島 秀伸
  • Organizer: 天文学会春季年会
  • Place of Presentation: 首都大学東京
  • Year and Date: 2016-03-16
• [Presentation] 数値シミュレーションで探る銀河形成 (2015)
  • Author(s): 矢島 秀伸
  • Organizer: 初代星・初代銀河研究会2015
  • Place of Presentation: 群馬大学
  • Year and Date: 2015-12-02
  • Invited
• [Presentation] 宇宙再電離期における銀河形成史 (2015)
  • Author(s): 矢島 秀伸
  • Organizer: 銀河進化と遠方宇宙2015
  • Place of Presentation: 神戸三ノ宮
  • Year and Date: 2015-09-08
  • Invited