Formation of star clusters in galacitc disks and the origin of the variation of star clusters

• Project/Area Number: 26800108
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Astronomy
• Research Institution: The University of Tokyo (2015-2017); National Astronomical Observatory of Japan (2014)
• Principal Investigator: Fujii Michiko 東京大学, 大学院理学系研究科(理学部), 准教授 (90722330)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 星団 / N体シミュレーション / 天の川銀河 / 星団形成 / 流体シミュレーション / 大質量星団 / 銀河円盤

Outline of Final Research Achievements

Recent observations have found various kinds of star clusters such as massive, dense clusters as young as open clusters and embedded clusters, which are beyond classical classification: open or globular clusters. We study the formation mechanism of these various star clusters. We especially focus on their similarities/differences and the relation to the galactic environment. We performed numerical simulations of star clusters forming in giant molecular clouds (GMC) and found that GMCs typical in the Milky Way (MW) form open clusters, but ones typical in star-forming galaxies form young massive (dense) star clusters. We in addition investigated a galaxy model which is similar to the MW and found parameters in order to reproduce the MW in numerical simulations.

Research Products

• [Int'l Joint Research] ライデン大学(オランダ)
• [Int'l Joint Research] テキサス大学(アメリカ)
• [Int'l Joint Research] Leiden Observatory(オランダ)
• [Int'l Joint Research] Leiden Observatory(オランダ)
• [Journal Article] Formation of the First Star Clusters and Massive Star Binaries by Fragmentation of Filamentary Primordial Gas Clouds (2018)
  • Author(s): Hirano Shingo , Yoshida Naoki , Sakurai Yuya , Fujii Michiko S.
  • Journal Title: The Astrophysical Journal Volume: 855 Pages: 17-17
  • DOI: 10.3847/1538-4357/aaaaba
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The dynamics of stellar discs in live dark-matter haloes (2018)
  • Author(s): Fujii M S、Bedorf J、Baba J、Zwart S Portegies
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 印刷中 Pages: 14511471-14511471
  • DOI: 10.1093/mnras/sty711
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Early chemo-dynamical evolution of dwarf galaxies deduced from enrichment ofr-process elements (2017)
  • Author(s): Yutaka Hirai, Yuhri Ishimaru, Takayuki R Saitoh, Michiko S Fujii, Jun Hidaka, Toshitaka Kajino
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 466 Pages: 2474-2487
  • DOI: 10.1093/mnras/stw3342
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Formation of intermediate-mass black holes through runaway collisions in the first star clusters (2017)
  • Author(s): Sakurai Yuya , Yoshida Naoki , Fujii Michiko S. , Hirano Shingo
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 472 Pages: 1677-1684
  • DOI: 10.1093/mnras/stx2044
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Formation of young massive clusters from turbulent molecular clouds (2017)
  • Author(s): Fujii, Michiko S., Portegies Zwart, Simon
  • Journal Title: Formation, evolution, and survival of massive star clusters, Proceedings of the International Astronomical Union, IAU Symposium Volume: 316 Pages: 25-30
  • DOI: 10.1017/s1743921316000545
  • Int'l Joint Research
• [Journal Article] The Scaling Relations and Star Formation Laws of Mini-starburst Complexes (2016)
  • Author(s): Nguyen-Luong, Quang, Nguyen, Hans V. V., Motte, Frederique, Schneider, Nicola, Fujii, Michiko, Louvet, Fabien, Hill, Tracey, Sanhueza, Patricio, Chibueze, James O., Didelon, Pierre
  • Journal Title: The Astrophysical Journal Volume: 833
  • DOI: 10.3847/0004-637x/833/1/23
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The Formation and Dynamical Evolution of Young Star Clusters (2016)
  • Author(s): Fujii, M. S. and Portegies Zwart, S.
  • Journal Title: The Astrophysical Journal Volume: 817
  • DOI: 10.3847/0004-637x/817/1/4
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Astrophysical site(s) of r-process elements in galactic chemodynamical evolution model (2016)
  • Author(s): Hirai, Yutaka; Ishimaru, Yuhri; Saitoh, Takayuki R.; Fujii, Michiko S.; Hidaka, Jun; Kajino, Toshitaka
  • Journal Title: The 13th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG2015) Volume: 109
  • DOI: 10.1051/epjconf/201610902001
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] The initial mass function of star clusters that form in turbulent molecular clouds (2015)
  • Author(s): Fujii, M. S. and Portegies Zwart, S.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 449 Pages: 726-740
  • DOI: 10.1093/mnras/stv293
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Formation of young massive clusters from turbulent molecular clouds (2015)
  • Author(s): Fujii, M. S.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 67
  • DOI: 10.1093/pasj/psu137
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Enrichment of R-process Elements in Dwarf Spheroidal Galaxies in Chemo- dynamical Evolution Model (2015)
  • Author(s): Hirai, Yutaka; Ishimaru, Yuhri; Saitoh, Takayuki R.; Fujii, Michiko S.; Hidaka, Jun; Kajino, Toshitaka
  • Journal Title: Astrophys. J. Volume: 814
  • DOI: 10.1088/0004-637x/814/1/41
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] 天の川銀河のバー形成史とダークマターハローの回転 (2018)
  • Author(s): 藤井通子
  • Organizer: 日本天文学会2018年春季年会
• [Presentation] The formation and dynamical evolution of star clusters (2016)
  • Author(s): 藤井通子
  • Organizer: 国立天文台天文シミュレーションプロジェクト平成27年度ユーザーズミーティング
  • Place of Presentation: 国立天文台（岩手県水沢市）
  • Year and Date: 2016-01-28
• [Presentation] Can globular clusters bring millisecond pulsars in the Galactic center?:Tidal disruption of star clusters in the Galactic center (2016)
  • Author(s): 藤井通子
  • Organizer: 特別推進研究研究会・宇宙線研究所共同利用研究会「高エネルギーガンマ線でみる極限宇宙2015」
  • Place of Presentation: 東京大学（茨城県柏市）
  • Year and Date: 2016-01-13
  • Invited
• [Presentation] The formation and dynamical evolution of young star clusters (2015)
  • Author(s): Fujii, M
  • Organizer: MODEST-15S
  • Place of Presentation: 神戸大学（兵庫県神戸市）
  • Year and Date: 2015-12-07
  • Int'l Joint Research / Invited
• [Presentation] The Origin of the Mass Function of Star Clusters (2015)
  • Author(s): Michiko Fujii
  • Organizer: IAU General Assembly FM 18: Scale-free processes in the universe
  • Place of Presentation: Honolulu, Hawaii, USA
  • Year and Date: 2015-08-12 – 2015-08-14
  • Invited
• [Presentation] The Origin of the Mass Function of Star Clusters (2015)
  • Author(s): Fujii, M.
  • Organizer: XXIX IAU General Assembly, FM18: Scale-free processes in the universe
  • Place of Presentation: Hawaii Convention Center、ホノルル、アメリカ
  • Year and Date: 2015-08-12
  • Int'l Joint Research / Invited
• [Presentation] Formation of young massive clusters from turbulent molecular clouds (2015)
  • Author(s): Fujii, M. and Portegies Zwart, S.
  • Organizer: IAUS 316: Formation, evolution, and survival of massive star clusters
  • Place of Presentation: Hawaii Convention Center、ホノルル、アメリカ
  • Year and Date: 2015-08-11
  • Int'l Joint Research
• [Presentation] Formation of intermediate-mass black holes in star clusters (2015)
  • Author(s): Fujjii, M.
  • Organizer: Max's 4 questions in X-ray astronomy to be addressed with ASTRO-H
  • Place of Presentation: 東京大学（東京都文京区）
  • Year and Date: 2015-07-31
  • Int'l Joint Research / Invited
• [Presentation] 散開星団の力学進化 (2014)
  • Author(s): 藤井通子
  • Organizer: 第１回DTAシンポジウム「星形成領域および星団環境での惑星の形成と進化」
  • Place of Presentation: 国立天文台（東京都）
  • Year and Date: 2014-09-29 – 2014-09-30
  • Invited
• [Presentation] 10億体を用いた銀河円盤のN体シミュレーション (2014)
  • Author(s): 藤井通子
  • Organizer: 日本天文学会2014年秋季年会
  • Place of Presentation: 山形大学（山形県）
  • Year and Date: 2014-09-11 – 2014-09-13
• [Remarks] 研究者ホームページ
  • URL: http://cas.astron.s.u-tokyo.ac.jp/~fujii/
• [Remarks] Michiko FUJII's home page
  • URL: http://cas.astron.s.u-tokyo.ac.jp/~fujii/
• [Remarks] 国立天文台理論研究部 Research Highlights
  • URL: http://th.nao.ac.jp/research.html