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Cosmological Simulations of Formation of Galaxies and Clustersand Origin of biasing

Research Project

Project/Area Number 12640231
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionThe University of Tokyo

Principal Investigator

SUTO Yasushi  THE UNIVERSITY OF TOKYO, graduate school of science, associate professor, 大学院・理学系研究科, 助教授 (20206569)

Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2001: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2000: ¥1,400,000 (Direct Cost: ¥1,400,000)
Keywordscosmology / dark matter / galaxies / clusters of galaxies / bias / numerical simulation / cosmology / dark matter / galaxies / clusters of galaxies / bias / numerical simulation / 銀河 / 銀河団 / 宇宙論 / 数値シミュレーション / 非線形重力
Research Abstract

(1) Nonlinear Stochastic Biasing in dark matter halos and high-density peaks : We quantifiesthe degree of nonlinearity and stochasticity of the clustering of biased objects, using cosmological N-body simulations. Adopting the peaks and the halos as representative biasing models, we focus on the two-point correlation of the biased objects, dark matter and their cross-correlation. Especially, we take account of the effect of redshift-space distortion and attempt to clarify the scale-dependence and the time-dependence by analyzing the biasing factor and the cross-correlation factor. On small scales, stochasticity and nonlinearity become appreciable and strongly object-dependent, especially in redshift space due to the pair-wise velocity dispersion of the biased objects. Nevertheless, an approximation of deterministic linear biasingworks reasonably well even in the quasi-linear regime, and linear redshift-space distortion explains the clustering amplitudes in redshift space in this regime.
… More (2) Biasing model of galaxies and clusters on the basis of cosmological hydrodynamic simulations :
We perform an extensive analysis of nonlinear and stochastic biasing of galaxies and dark halos in spatially flat low-density COM universe using cosmological hydrodynamic simulations. We compare their biasing properties with the predictions of an analytic halo biasing model. Interestingly the biasing properties of galaxies are better described by extrapolating the halo biasing model predictions. The clustering amplitudes of galaxies are almost independent of the redshift between z=0 and 3 as reported in previous simulations. We also find the clear dependence of galaxy biasing on their formation epoch ; the distribution of old populations of galaxies tightly correlates with the underlying mass density field, while that of young populations is slightly more stochastic and anti-biased relative to dark matter. The amplitude of two-point correlation function of old populations is about 3 times larger than that of the young populations. Furthermore, the old population of galaxies reside within massive dark halos while the young galaxies are preferentially formed in smaller dark halos. Assuming that the observed early and late-type galaxies correspond to the simulated old and young populations of galaxies, respectively, all of these segregations of galaxies are consistent with observational ones for the early and late-type of galaxies such as the morphology-density relation of galaxies. Less

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] Takashi Hamana: "Reliability of the dark matter clustering in cosmological N-body simulation on scales below the mean separation length of particles"The Astrophysical Journal. 568. 455-462 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Masamune Oguri: "Strong Gravitational Lensing Time Delay Statistics and the Density Profile of Dark Halos"The Astrophysical Journal. 568. 488-499 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.P.Jing: "Triaxial Modeling of Halo Density Profiles with High-resolution N-body Simulations"The Astrophysical Journal. 574. 538-553 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Takeshi Kuwabara: "Modeling Pairwise Peculiar Velocity Distribution Function of Dark Matter from Halo Density Profiles"Publications of the Astronomical Society of Japan. 54. 503-513 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Mamoru Shimizu: "Reliability of merger tree realizations of dark halos in the Monte-Carlo modeling of galaxy formation"Publications of the Astronomical Society of Japan. 54. 645-653 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Chiaki Hikage: "Three--Dimensional Genus Statistics of SDSS galaxies in the Early Data Release"Publications of the Astronomical Society of Japan. 54. 707-717 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Hamana, N.Yoshida and Y.Suto: "Reliability of the dark matter clustering in cosmological N-body simulation on scales below the mean separation length of particles"Ap.J.. 568. 455-462 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Oguri, A.Taruya, Y.Suto and E.L. Turner: "Strong Gravitational Lensing Time Delay Statistics and the Density Profile of Dark Halos"Ap.J.. 568. 488-499 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.P. Jing, and Y.Suto: "Triaxial Modeling of Halo Density Profiles with High-resolution N-body Simulations"Ap.J.. 574. 538-553 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Kuwabara, A.Taruya, and Y.Suto: "Modeling Pairwise Peculiar Velocity Distribution Function of Dark Matter from Halo Density Profiles"PASJ. 54. 503-513 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.Shimizu, T.Kitayama, S.Sasaki, and Y.Suto: "Reliability of merger tree realizations of dark halos in the Monte-Carlo modeling of galaxy formation"PASJ. 54. 645-653 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] C.Hikage, Y.Suto, I.Kayo, A.Taruya, T.Matsubara, M.S. Vogeley, F.Hoyle, J. R.Gott, III, and J. Brinkmann (for the SDSS collaboration): "Three-Dimensional Genus Statistics of SDSS galaxies in the Early Data Release"PASJ. 54. 707-717 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Takashi Hamana: "Reliability of the dark matter clustering in cosmological N-body simulation on scales below the mean separation length of particles"The Astrophysical Journal. 568. 455-462 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Masamune Oguri: "Strong Gravitational Lensing Time Delay Statistics and the Density Profile of Dark Halos"The Astrophysical Journal. 568. 488-499 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Y.P.Jing: "Triaxial Modeling of Halo Density Profiles with High-resolution N-body Simulations"The Astrophysical Journal. 574. 538-553 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Takeshi Kuwabara: "Modeling Pairwise Peculiar Velocity Distribution Function of Dark Matter from Halo Density Profiles"Publications of the Astronomical Society of Japan. 54. 503-513 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Mamoru Shimizu: "Reliability of merger tree realizations of dark halos in the Monte-Carlo modeling of galaxy formation"Publications of the Astronomical Society of Japan. 54. 645-653 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Chiaki Hikage: "Three--Dimensional Genus Statistics of SDSS galaxies in the Early Data Release"Publications of the Astronomical Society of Japan. 54. 707-717 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Atsushi Taruya: "Nonlinear Stochastic Biasing of Peaks and Halos: Scale-Dependence, Time-Evolution, and Redshift-Space Distortion from Cosmological N-body Simulations"Publications of the Astronomical Society of Japan. 53. 155-167 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Chiaki Hikage: "Genus Statistics for Galaxy Clusters and Nonlinear Biasing of Dark Matter Halos"The Astrophysical Journal. 556. 641-652 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Toshiyuki Fukushige: "The mean pairwise peculiar velocity in cosmological N-body simulation: time variation, scale dependence and stable condition"The Astrophysical Journal. 557. L11-L14 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Kohji Yoshikawa: "Nonlinear Stochastic Biasing of Galaxies and Dark Halos in Cosmological Hydrodynamic Simulations"The Astrophysical Journal. 558. 520-534 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Masamune Oguri: "Probing Core Structure of Dark Halos with Tangential and Radial Arc Statistics"The Astrophysical Journal. 559. 572-583 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Issha Kayo: "Probability Distribution Function of Cosmological Density Fluctuations from Gaussian Initial Condition: Comparison of One-and Two-point Log-normal Model Predictions with N-body Simulations"The Astrophysical Journal. 561. 22-34 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yasushi Suto: "Light-cone effect on clustering statistics in cosmological redshift space"Publications of the Astronomical Society of Japan. 52. 249-257 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Yasushi Suto: "Two-point correlation functions of X-ray selected clusters of galaxies : theoretical predictions for flux-limited surveys"The Astrophysical Journal. 534. 551-558 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Kohji Yoshikawa: "Cosmological SPH simulations with four million particles : statistical properties of X-ray clusters in a low-density universe"The Astrophysical Journal. 535. 593-601 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Atsushi Taruya: "Nonlinear stochastic biasing from the formation epoch distribution of dark halos"The Astrophysical Journal. 542. 559-577 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Ichi Tanaka: "Superclustering of faint galaxies in the field of a QSO concentration at z〜1"The Astrophysical Journal. 547. 521-530 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Eiichiro Komatsu: "Substructure revealed by the Sunyaev-Zel'dovich effect at 150GHz in the high resolution map of RX J1347-1145"Publications of the Astronomical Society of Japan. 53(印刷中). (2001)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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