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International Journal for Multiscale Computational Engineering

ISSN for PRINT: 1543-1649

Institutional price:	$747.00
Issues per year:	6

Best Paper Award Selection - Editorial Board Site

2006, Volume4

106 pages

DOI: 10.1615/IntJMultCompEng.v4.i2

Issue price - $128.00

Formation of Dwarf Galaxies in Reionized Universe with Heterogeneous Multicomputer System

Taisuke Boku
Institute of Information Sciences and Electronics, and Center for Computational Physics, University of Tsukuba, Tennodai, Tsukuba-shi, Ibaraki, Japan

Hajime Susa
Department of Physics, Faculty of Science, Rikkyo University

Kenji Onuma
Doctoral Program of Systems and Information Engineering, Graduate School, University of Tsukuba, Tennodai, Tsukuba-shi, Ibaraki, Japan

Masayuki Umemura
Institute of Physics, Center for Computational Physics, University of Tsukuba, Tennodai, Tsukuba-shi, Ibaraki, Japan

Mitsuhisa Sato
Institute of Information Sciences and Electronics, and Center for Computational Physics, University of Tsukuba, Tennodai, Tsukuba-shi, Ibaraki, Japan

Daisuke Takahashi
Institute of Information Sciences and Electronics, and Center for Computational Physics, University of Tsukuba, Tennodai, Tsukuba-shi, Ibaraki, Japan

ABSTRACT

HMCS (heterogeneous multicomputer system) is a very powerful and ideal computational environment for large-scale computational astrophysics simulations including multiple physical phenomena, such as radiation transfer, radiative cooling, chemical reaction network, hydrodynamics, and gravity. In this system, general purpose and special purpose parallel processing systems are involved to realize very high-performance computation. We have constructed a system with MPP and PC-cluster as general purpose side and GRAPE-6 gravity engine as special purpose side. We perform 3D radiation smoothed-particle-hydrodynamics simulations on the formation and the photoevaporation of sub galactic objects (M ∼ 10⁸−10⁹ M_Θ). We confirm the suppression of the formation of small galaxies after the reionization. We also find that the galaxies that undergo violent photoevaporation process still retain certain amount of stars, which are formed at small scale high-density peaks. These cooled components merge with each other when the dark matter halo of the whole system is formed. It is also found these low mass galaxies should have large mass-to-light ratios, and these systems could be the progenitor of dwarf spheroidal galaxies in local group.