2005 Fiscal Year Final Research Report Summary
Study of the evolution of dense stellar systems by large-scale simulations on special-purpose computers
| Project/Area Number |
15540230
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | The University of Tokyo |
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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)
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| 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)
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| Project Period (FY) |
2003 – 2005
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| Keywords | Parallel algorithms / Special-purpose computers / Stellar Dynamic / Merging instability / Black hole / Dynamical Friction |
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| 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.
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Research Products
(9 results)
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[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.
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Journal Title
Description
「研究成果報告書概要(欧文)」より
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