2007 Fiscal Year Final Research Report Summary
Elucidation on the Origin of First Generation Objects by HMCS-E (Heterogeneous MultiComputer System-Embedded)
| Project/Area Number |
16002003
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| Research Category |
Grant-in-Aid for Specially Promoted Research
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
Mathematics and Physics
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| Research Institution | University of Tsukuba |
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Principal Investigator |
UMEMURA Masayuki University of Tsukuba, Graduate School of Pure and Applied Sciences, Professor (70183754)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMOTO Taishi Tokyo Institute of Technology, Graduate School of Science and Engineering, Associate Professor (60261757)
BOKU Taisuke University of Tsukuba, Graduate School of Systems and Information Engineering, Professor (90209346)
TAKAHASHI Daisuke University of Tsukuba, Graduate School of Systems and Information Engineering, Associate Professor (00292714)
SUSA Hajime Konan University, Graduate School of Natural Science, Associate Professor (00323262)
MORI Masao Senshu University, School of Law, Associate Professor (10338585)
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| Project Period (FY) |
2004 – 2007
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| Keywords | First generation of cosmic objects / Galaxy formation / Galactic evolution / Cosmic Structure / Radiation hydrodynamics / Radiation transfer / Prarallel computer / Special purpose computer |
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| Research Abstract |
The formation of first generation objects in the universe is an fundamental issue to clarify the cosmic evolution, the galaxy formation, and the generation of heavy elements. The objective of the project is to elucidate the origin of first generation objects in the universe by performing ultra-high resolution simulations. For the purpose, the special purpose board for gravity calculations "Blade-GRAPE" has been newly developed, and Cosmo Simulator "FIRST", which is a PC cluster system with embedded Blade-GRAPE in each node, has been completed. This is the collaboration between experts on astrophysical simulations and those on computer technology. FIRST is composed of 256 nodes and 496CPUs, and possesses two file servers. The peak performance of FIRST is 33TFLOPS in total, where the host system is 3.1 TFLOPS and the part of Blade-GRAPEs is 33TFLOPS. Also, Gfarm file system, which is a scalable virtual file system federating local file systems of cluster nodes, is providing a 22TB file s
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ystem. The development of such a hybrid computer system is quite unique in the world.
Large-scale simulations have been performed with FIRST, and a variety of results are obtained as follows : (1) discovery of the dependence on dark matter cusps of the formation of first generation objects, (2) derivation of the criteria for radiative feedback by first stars by radiation hydrodynamic simulations, (3) proposal of a new picture of globular cluster formation by radiation hydrodynamic and N-body simulations on the formation of star clusters in ultraviolet background radiation. (4) derivation of the escape probability of ionizing photons from primeval galaxies, (5) effects of non-equilibrium atomic processes on the collision of galaxy clusters, (6) proposal of a new picture of 'Andromeda tears' through the collision with a satellite galaxy. In particular, the result (1) has been obtained by raising the mass resolution by more than two order of magnitude compared to previous simulations. This gives a novel picture of first generation objects. Less
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[Journal Article] Cosmological Radiative Transfer Codes Comparison Project I : The Static Density Field Tests2006
Author(s)
I. T. Iliev, B. Ciardi, M. A. Alvarez, A. Maselli, A. Ferrara, N. Y. Gnedin, G. Mellema, T. Nakamoto, M. L. Norman, A. O. Razoumov, E. Rijkhorst, J. Ritzerveld, P. R. Shapiro, H. Susa, M. Umemura, D. J. Whalen
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Journal Title
Mon. Not. Roy. Astron. Soc. 371
Pages: 1057-1086
Description
「研究成果報告書概要(欧文)」より
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