Understanding physical mechanisms of mass assembly effects on evolution of dark matter halos and an improvement of the halo model

• Project/Area Number: 17K05457
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: Hamana Takashi 国立天文台, 科学研究部, 助教 (70399301)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 観測的宇宙論

Outline of Final Research Achievements

We have investigated a physical mechanism that drives mass assembly effects on properties of dark matter halos. We found that amplitudes of spatial clustering of halos and peculiar velocity dispersion are most strongly depend on a local matter density. We also fount that the redshift-space distortion of two-point correlation function of dark matter halos depends strongly on a local density as well, and that halos located at high density regions have a stronger redshift-space distortion and those at low density regions have a relatively larger redshift-space distortion in a component opposite to the normal direction. This indicates that an observed redshift-space distortion depends on a local matter density where galaxies used in the measurement of the redshift-space distortion are located. This point has not been taken into consideration in previous studies and is an important finding of this research project.

Academic Significance and Societal Importance of the Research Achievements

今日の標準的構造形成シナリオでは、暗黒物質ハローは宇宙の構造形成において骨格をなす役割を果たしていると考えられている。従来、暗黒物質ハローの性質はハロー質量のみに依存すると考えられていた。しかし近年の数値シミュレーションによる暗黒物質構造形成の研究により、暗黒物質ハローの性質は質量のみではなく質量集積史にも依存する事が分かってきた。 しかしこの依存性がどういった物理メカニズムで引き起こされているのかはよく理解されていなかった。 本研究では暗黒物質ハローの周辺密度が質量集積史効果を引き起こす主要な物理メカニズムであることを明らかにし、その効果を取り入れたモデル拡張を行なった。

Research Products

• [Journal Article] Weak-lensing clusters from HSC survey first-year data: Mitigating the dilution effect of foreground and cluster-member galaxies (2020)
  • Author(s): Hamana Takashi、Shirasaki Masato、Lin Yen-Ting
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 72 Issue: 5
  • DOI: 10.1093/pasj/psaa068
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Cosmological constraints from cosmic shear two-point correlation functions with HSC survey first-year data (2020)
  • Author(s): Hamana Takashi、Shirasaki Masato、Miyazaki Satoshi、et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 72 Issue: 1 Pages: 16-16
  • DOI: 10.1093/pasj/psz138
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data (2019)
  • Author(s): Hikage Chiaki、Oguri Masamune、et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 印刷中 Issue: 2 Pages: 43-43
  • DOI: 10.1093/pasj/psz010
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Mock galaxy shape catalogues in the Subaru Hyper Suprime-Cam Survey (2019)
  • Author(s): Masato Shirasaki, Takashi Hamana, Masahiro Takada, Ryuichi Takahashi, Hironao Miyatake
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 印刷中 Issue: 1 Pages: 52-69
  • DOI: 10.1093/mnras/stz791
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] X-ray properties of high-richness CAMIRA clusters in the Hyper Suprime-Cam Subaru Strategic Program field (2019)
  • Author(s): Ota Naomi、Mitsuishi Ikuyuki、Babazaki Yasunori、Akamatsu Hiroki、Ichinohe Yuto、Ueda Shutaro、Okabe Nobuhiro、Oguri Masamune、Fujimoto Ryuichi、Hamana Takashi、Miyaoka Keita、Miyazaki Satoshi、Otani Hanae、Tanaka Keigo、Tsuji Ayumi、Yoshida Atsushi
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 72 Issue: 1 Pages: 1-12
  • DOI: 10.1093/pasj/psz118
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] HSC弱重力レンズ効果による天文学 (2019)
  • Author(s): 梅津敬一, 大栗真宗, 浜名崇, 日影千秋, 宮武広直
  • Journal Title: 天文月報 Volume: 112 Pages: 117-125
  • Open Access
• [Journal Article] A large sample of shear-selected clusters from the Hyper Suprime-Cam Subaru Strategic Program S16A Wide field mass maps (2018)
  • Author(s): Miyazaki Satoshi、Oguri Masamune、Hamana Takashi、Shirasaki Masato、Koike Michitaro、Komiyama Yutaka、Umetsu Keiichi、Utsumi Yousuke、Okabe Nobuhiro、More Surhud、Medezinski Elinor、Lin Yen-Ting、Miyatake Hironao、Murayama Hitoshi、Ota Naomi、Mitsuishi Ikuyuki
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Issue: SP1
  • DOI: 10.1093/pasj/psx120
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The Galaxy?Halo Connection in High-redshift Universe: Details and Evolution of Stellar-to-halo Mass Ratios of Lyman Break Galaxies on CFHTLS Deep Fields (2017)
  • Author(s): Ishikawa Shogo、Kashikawa Nobunari、Toshikawa Jun、Tanaka Masayuki、Hamana Takashi、Niino Yuu、Ichikawa Kohei、Uchiyama Hisakazu
  • Journal Title: The Astrophysical Journal Volume: 841 Issue: 1 Pages: 8-8
  • DOI: 10.3847/1538-4357/aa6d64
  • Peer Reviewed / Open Access
• [Journal Article] Robust covariance estimation of galaxy?galaxy weak lensing: validation and limitation of jackknife covariance (2017)
  • Author(s): Shirasaki Masato、Takada Masahiro、Miyatake Hironao、Takahashi Ryuichi、Hamana Takashi、Nishimichi Takahiro、Murata Ryoma
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 470 Issue: 3 Pages: 3476-3496
  • DOI: 10.1093/mnras/stx1477
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Full-sky Gravitational Lensing Simulation for Large-area Galaxy Surveys and Cosmic Microwave Background Experiments (2017)
  • Author(s): Takahashi Ryuichi、Hamana Takashi、Shirasaki Masato、Namikawa Toshiya、Nishimichi Takahiro、Osato Ken、Shiroyama Kosei
  • Journal Title: The Astrophysical Journal Volume: 850 Issue: 1 Pages: 24-24
  • DOI: 10.3847/1538-4357/aa943d
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The first-year shear catalog of the Subaru Hyper Suprime-Cam Subaru Strategic Program Survey (2017)
  • Author(s): Mandelbaum Rachel、Miyatake Hironao、Hamana Takashi、et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Issue: SP1 Pages: 1-43
  • DOI: 10.1093/pasj/psx130
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Dilution効果を軽減する弱重力レンズ銀河団検出法の開発とHSCサーベイ初年度データへの応用 (2021)
  • Author(s): 浜名崇
  • Organizer: 日本天文学会2021年春季年会
• [Presentation] HSC weak lensing 銀河団探査 (2020)
  • Author(s): 浜名崇
  • Organizer: 第9回観測的宇宙論ワークショップ
• [Presentation] 赤方偏移歪みの環境依存性 (2019)
  • Author(s): 浜名崇
  • Organizer: 第1回科学研究部シンポジウム「銀河赤方偏移探査による宇宙論研究会」
• [Presentation] HSCサーベイ初年度データのコスミックシア二点相関関数測定と宇宙論パラメーターの制限 (2019)
  • Author(s): 浜名崇、宮崎聡, 日影千秋, 大栗真宗, More Surhud, HSC collaboration
  • Organizer: 日本天文学会2019年秋季年会
• [Presentation] HSC初年度データによるcosmic shear2点相関関数の測定と宇宙論パラメータの制限 (2019)
  • Author(s): 浜名崇
  • Organizer: 第8回観測的宇宙論ワークショップ
• [Presentation] 弱い重力レンズ効果を用いた宇宙論研究とすばるHyper-SuprimeCamの初期成果 (2018)
  • Author(s): 浜名崇
  • Organizer: すばる望遠鏡による宇宙シア観測と暗黒エネルギー研究会
• [Presentation] HSC初年度データによるcosmic shear２点相関関数の測定と宇宙モデルの制限 (2018)
  • Author(s): 浜名崇
  • Organizer: 第７回観測的宇宙論ワークショップ
• [Presentation] dark matter haloの特異速度統計とアセンブリバイアス (2017)
  • Author(s): 浜名崇
  • Organizer: 第6回観測的宇宙論ワークショップ