The Dependence of Fragmentation of Metal-Deficient Gas Clouds on H2 and HD Cooling and the Initial Mass Function of First Generation Stars

スポンサーリンク

概要

• 論文の詳細を見る

• Recent three-dimensional numerical simulations have shown that a filamentary structureis one of the most prominent features in the structure formation of the early universe. Fragmentation of the filamentary clouds is expected to lead to the formation of first generationstars. In this context, we have studied the gravitational collapse and fragmentation of filamentary clouds with axisymmetric hydrodynamic simulations coupled with non-equilibriumchemistry of H_2 and HD. In this paper, we review our recent results and show some supplemental numerical results. Special attention is paid to the dynamical stability of the filamentary clouds and the role of HD cooling which becomes more dominant than H_2 cool-ing in some intergalactie environments. Our simulations suggest that the first generationstars are deficient in sub-solar mass stars. According to these simulations, a typical massof low-mass first stars should be of order of 1M_〓, and a typical mass of massive first starsshould be around 10^2M_〓 or 10M_〓, depending on the H_2 fractional abundance, which determines the efficiency of HD cooling. We predict that the stellar IMF is bimodal with twopeaks at 1 - 2M_〓 and 10^2M_〓 or 10M_〓.

• 理論物理学刊行会の論文
• 2003-02-28

著者

• Umemura Masayuki

  Center For Computational Physics University Of Tsukuba

• Umemura Masayuki

  Center For Computational Physics Uneversity Of Tsukuba

• NAKAMURA Fumitaka

  Faculty of Education and Human Sciences, Niigata University

• Umemura Masayuki

  Center For Computational Physics Tsukuba University

• Nakamura Fumitaka

  Faculty Of Education And Human Sciences Niigata University:astronomy Department University Of Califo

• UMEMURA Masayuki

  Center for Computational Physics, Uneversity of Tsukuba

• NAKAMURA Fumitaka

  Faculty of Education and Human Sciences, Niigata University:Astronomy Department, University of California at Berkeley

関連論文

• The SUBARU Deep Field Project : Lyman α Emitters at a Redshift of 6.6
• Radiation Hydrodynamical Mass Accretion onto Galactic Nuclei Driven by Circumnuclear Starbursts
• The Subaru Deep Field : The Optical Imaging Data
• The Discovery of Two Lyman α Emitters beyond Redshift 6 in the Subaru Deep Field
• Quasar Mesolensing : Direct Probe to Substructures around Galaxies
• Cosmological Accretion Disk Embedded in Background Radiation : Interplay of Viscosity and Radiation Drag
• Radiative Avalanche Driven by Spherical Starbursts
• マイクロレンズを用いた、活動銀河核中心部の分解(重力レンズ現象とHigh-Redshift宇宙,研究会報告)
• Theoretical Models of Multi-Waveband QSO Luminosity Functions
• The Dependence of Fragmentation of Metal-Deficient Gas Clouds on H2 and HD Cooling and the Initial Mass Function of First Generation Stars
• Involvement of IL-17 in Fas ligand-induced inflammation
• A Coevolution Scheme for Supermassive Black Holes and Galactic Bulges(Session 6 : Formation and Evolution of Black Holes)
• Formation of Massive Black Holes in Globular Clusters(Poster)
• Self-Similar Viscous Collapse of a Self-Gravitating, Polytropic Gas Disk
• Gravitational Collapse of Spherical Interstellar Clouds
• A Coevolution Scheme for Supermassive Black Holes and Galactic Bulges(Session 6 : Formation and Evolution of Black Holes)
• Formation of Massive Black Holes in Globular Clusters(Poster)

もっと見る 閉じる

スポンサーリンク