• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2005 Fiscal Year Final Research Report Summary

Study of the evolution of dense stellar systems by large-scale simulations on special-purpose computers

Research Project

Project/Area Number 15540230
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

MAKINO Junichiro  The University of Tokyo, Graduate School of Science, Associate Professor, 大学院・理学系研究科, 助教授 (50229340)

Co-Investigator(Kenkyū-buntansha) FUNATO Yoko  The University of Tokyo, Graduate School of Arts and Sciences, Assistant Professor, 大学院・総合文化研究科, 助手 (80292720)
Project Period (FY) 2003 – 2005
KeywordsParallel algorithms / Special-purpose computers / Stellar Dynamic / Merging instability / Black hole / Dynamical Friction
Research Abstract

The purpose of this study is to clarify the dynamical evolution of dense stellar systems, such as globular clusters, so-called young and compact clusters, and galactic nuclei, by means of direct N-body simulations. The focus of the study is how the massive black holes grow at the center of these systems. Specifically, we placed two goals. (a) To determine the criterion for the occurrence of the merging instability, in which massive stars merge with other massive stars progressively to form supermassive stars, and (b) to identify the observable signature of massive central black holes in globular clusters and other massive star clusters. As for the condition for the merging instability, we found that the condition is that the initial dynamical friction timescale of massive stars is short (less than 3Mys) and that the initial core radius is fairly small. When fitted by a King mode, W0 must be 8 or larger. For the observational signature of the central black hole, previous observational studies looked for a cusp with slope -7/4, predicted from simple single-component model. By means of N-body calculation in which stellar evolution and stellar mass function are taken into account, we found that the central region of a globular cluster with central massive black hole appears as almost flat core.

  • Research Products

    (9 results)

All 2006 2005 2004

All Journal Article (9 results)

  • [Journal Article] The ecology of star clusters and intermediate mass black holes in the Galactic bulge2006

    • Author(s)
      Portegies Zwart, S., Baumgardt, H., McMillan, S.L.W., Makino, J.et al.
    • Journal Title

      ApJ 641

      Pages: 319-326

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] The Ecology of Star Clusters Intermediate-Mass Black Holes in the Galactic Bulge.2006

    • Author(s)
      Portegies Zwart, S.F., Baumgardt, H., McMillan, S.L.W., Makino, J., Hut, P., Ebisuzaki, T.
    • Journal Title

      ApJ. 641

      Pages: 319-3226

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] GRAPE-6A : A Single-Card GRAPE-6 for Parallel PC-GRAPE Cluster Systems2005

    • Author(s)
      Fukushige, T., Makino, J., Kawai, A.
    • Journal Title

      PASJ 57

      Pages: 1009-1021

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] GRAPE and Project Milkyway2005

    • Author(s)
      Makino, J.
    • Journal Title

      Journal of Korean Astronomical Society 38

      Pages: 165-168

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Which Globular Clusters Contain Intermediate-Mass Black Holes?2005

    • Author(s)
      Baumgardt, H., Makino, J., Hut, P.
    • Journal Title

      ApJ 620

      Pages: 238-243

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Which Globular Clusters Contain Intermediate-Mass Black Holes?2005

    • Author(s)
      Baumgardt, H., Makino, J., P.Hut
    • Journal Title

      ApJ. 620

      Pages: 238-243

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Formation of massive black holes through runaway collisions in dense young star clusters,2004

    • Author(s)
      Portegies Zwart, S., Baumgardt, H., Hut, P., Makino, J.et al.
    • Journal Title

      Nature 428

      Pages: 724-726

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] A Fast Parallel Treecode with GRAPE2004

    • Author(s)
      Makino, J.
    • Journal Title

      PASJ 56

      Pages: 521-531

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Formation of massive black holes through runaway collisions in dense young star clusters2004

    • Author(s)
      Portegies Zwart, S.F., Baumgardt, H., Hut, P., Makino, J., McMillan, S.L.W.
    • Journal Title

      Nature 428

      Pages: 724-726

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2007-12-13  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi