1997 Fiscal Year Annual Research Report

数値的宇宙物理学

Research Project

Project/Area Number	09894006
Research Institution	National Astronomical Observatory of Japan
Principal Investigator	観山正見国立天文台, 理論天文学研究系, 教授 (00166191)
Co-Investigator(Kenkyū-buntansha)	梅村雅之筑波大学, 物理学系, 助教授 (70183754) 花輪知幸名古屋大学, 大学院・理学系研究科, 助教授 (50172953) 中村卓史京都大学, 基礎物理学研究所, 教授 (80155837) 柴田一成国立天文台, 太陽物理学研究系, 助教授 (70144178) 野本憲一東京大学, 大学院・理学系研究科, 教授 (90110676)
Keywords	数値シミュレーション / スパーコンピューター / 数値的天文学 / 数値的宇宙物理学 / ソフトウェアー開発 / 計算科学 / 国際シンポジウム / 専用計算機
Research Abstract	現代天文学の進展は、観測技術・観測機器の改良とスペース望遠鏡や大型望遠鏡の活躍によって目覚ましいものがある。しかし、天文学の一つの宿命は、様々な宇宙現象を実験的手段によって解析不可能であることである。宇宙の創世、銀河・星・惑星系の形成、ブラックホールの生成などの過程をいくつかの初期条件や環境効果(境界条件)を変えて解析することは不可能である。ところが、最近の超高速計算機の進展によって、基本方程式をプログラム化して、様々な初期条件や境界条件を与えることで、複雑な天体現象を解析することが可能となった(数値学的宇宙物理学)。天文学における唯一の実験的手段としての超高速計算機によるシミュレーションは、現代天文学においてますます重要性が高まっている。このような天文学における現状をもとに、国際シンポジウム「数値的宇宙物理学」が日本で平成10年に開催される予定である。この会議は、数値的宇宙物理学の世界的権威や活動的研究者を招待して、(1)新しい数値計算法の検討、(2)並列・ベクトル型スーパーコンピューターのための計算手法の検討、(3)専用計算機の新たな活用、(4)シミュレーション結果の提示と観測データとの比較等を目的としている。本申請研究では、国際シンポジウムの主催者である代表者が、国内の組織メンバーを研究班に加えて、この国際会議に向けて、国際会議の内容面に関する企画と、国内の研究者の有機的な連携の下に国際会議における研究面での準備を行うことを実行した。特に、国立天文台にスーパーコンピューターが平成8年に導入されたことも契機として、「数値的宇宙物理学」分野での研究が、国内で研究会を開き成果報告を実行してシンポジウムの準備会を開催した。

Research Products
(27 results)

All Other

All Publications (27 results)

[Publications] N.Kikuchi: "Global Spiral Modes in a Three-Phase Gravitating Disk" The Astrophysical Journal. 478. 446-461 (1997)
[Publications] S.Inutsuka: "A Production Mechanism for Clusters of Dense Cores" The Astrophysical Journal. 480. 681-693 (1997)
[Publications] Y.Aikawa: "Evolution of Molecular Abundance in Protoplanetary Disks" The Astrophysical Journal Letter. 486. L51-L54 (1997)
[Publications] K.Masunaga: "A Radiative Hydrodynamical Model For Protostellar Collapse 1.The First Collapse" The Astrophysical Journal. 495. 346-369 (1998)
[Publications] T.Takeuchi: "Wave Excitation in Isothermal Disks by External Gravity" Publication Astronomical Society of Japan. 398. 141-148 (1998)
[Publications] K.Nomoto: "Type Ia Supernovae:Their Origin and Possible Applications in Cosmology" Science. 276. 1378-1382 (1997)
[Publications] K.Iwamoto: "Instabilities and mixing in SN 1993J" The Astrophysical Journal. 477. 865-875 (1997)
[Publications] M.Mori: "The evolution of dwarf galaxies with star formation in outward propagating supershell" The Astrophysical Journal Letter. 478. L21-L24 (1997)
[Publications] S.Wanajo: "A quasi-analytic study of nucleosynthesis in ONeMg novae" Nuclear Physics. A621. 499-502 (1997)
[Publications] T.Magara: "Evolution of Eruptive Flares,I.Plasmoid Dynamics in Eruptive Flares" The Astrophysical Journal. 487. 437-446 (1997)
[Publications] R.Matsumoto: "Formation of a Kinked Alignment of Solar Active Regions" The Astrophysical Journal Letter. 493. L43-L46 (1998)
[Publications] T.Yokoyama: "Two-Dimensional Magnetohydrodynamic Simulation of Chromospheric Evaporation in a Solar Flare Based on Magnetic Reconnection Model" The Astrophysical Journal Letter. 494. L113-L116 (1998)
[Publications] M.Shibata: "Numerical study on the hydrodynamic instability of binary stars in the first post Newtonian approximation" Progress of Theoretical Physics. 98. 1081-1098 (1997)
[Publications] T.Nakamura: "Gravitaional Waves from Coalescing Black Hole Macho Binaries" The Astrophysical Journal Letter. 487. L139-L142 (1997)
[Publications] K.Oohara: "A Way to 3D Numerical Relativity" Progress of Theoretical Physics Supplement. 128. 183-250 (1997)
[Publications] K.Saigo: "Similarity Solution for Formation of A Circumstellar Disk through the Collapse of A Flattened Rotating Cloud" The Astrophysical Journal. 493. 342-350 (1997)
[Publications] T.Hanawa: "Stability of Similarity Solutions for a Gravitationally Contracting Sphere:Convergence to the Larson-Penston Solution" The Astrophysical Journal. 484. 238-244 (1997)
[Publications] F.Nakamura: "Non-axisymmetric Evolution of Dynamically Contracting Disks and Its Implication for Binary Formation" The Astrophysical Journal. 480. 701-704 (1997)
[Publications] T.Tsuribe: "Angular Momentum Transport in Early-formed Objects by Cosmic Background Radiation:Radiation-Hydrodynamical Approach" The Astrophysical Journal. 486. 48-59 (1997)
[Publications] E.L.Turner: "Very Strong Microlensing of Distant Luminous Stars by Relic Massive Black Holes" The Astrophysical Journal. 483. 603-607 (1997)
[Publications] S.Mineshige: "Self-Similar Collapse of Self-Gravitating Viscous Disk" The Astrophysical Journal Letter. 480. 167-172 (1997)
[Publications] S.Hirose: "Disk Accretion onto a Magnetized Young Star and Associated Jet Formation" Publication Astronomical Society of Japan. 49. 389-404 (1997)
[Publications] W.Chou: "Linear and Nonlinear Evolution of Parker Instability of Magnetic Flux Sheets in Co-Rotating Coordinates" Publication Astronomical Society of Japan. 49. 389-404 (1997)
[Publications] M.Den: "New Data Compression for Multi-Dimensional Numerical Simulation" Journal for Academic Computing and Networking. 1. 25-34 (1997)
[Publications] N.Pogorelov, T.Matsuda: "Influence of the interstellar magnetic field direction on the shape of the global heliopause" J.Geophysical Research. 103. 237-245 (1998)
[Publications] H.Yukawa: "Spiral Shocks in 3D Accretion Discs" Monthly Notice of Royal Astronomical Society. 292. 321-330 (1997)
[Publications] N.Pogorelov: "Application of numerical methods to modeling the stellar wind and interstellar medium interaction" Invited to CFD Reviews,John Wiley & Sons,Chichester. (in press). (1998)

1997 Fiscal Year Annual Research Report

数値的宇宙物理学

Principal Investigator

観山 正見 国立天文台, 理論天文学研究系, 教授 (00166191)

Research Products

[Publications] N.Kikuchi: "Global Spiral Modes in a Three-Phase Gravitating Disk" The Astrophysical Journal. 478. 446-461 (1997)

[Publications] S.Inutsuka: "A Production Mechanism for Clusters of Dense Cores" The Astrophysical Journal. 480. 681-693 (1997)

[Publications] Y.Aikawa: "Evolution of Molecular Abundance in Protoplanetary Disks" The Astrophysical Journal Letter. 486. L51-L54 (1997)

[Publications] K.Masunaga: "A Radiative Hydrodynamical Model For Protostellar Collapse 1.The First Collapse" The Astrophysical Journal. 495. 346-369 (1998)

[Publications] T.Takeuchi: "Wave Excitation in Isothermal Disks by External Gravity" Publication Astronomical Society of Japan. 398. 141-148 (1998)

[Publications] K.Nomoto: "Type Ia Supernovae:Their Origin and Possible Applications in Cosmology" Science. 276. 1378-1382 (1997)

[Publications] K.Iwamoto: "Instabilities and mixing in SN 1993J" The Astrophysical Journal. 477. 865-875 (1997)

[Publications] M.Mori: "The evolution of dwarf galaxies with star formation in outward propagating supershell" The Astrophysical Journal Letter. 478. L21-L24 (1997)

[Publications] S.Wanajo: "A quasi-analytic study of nucleosynthesis in ONeMg novae" Nuclear Physics. A621. 499-502 (1997)

[Publications] T.Magara: "Evolution of Eruptive Flares,I.Plasmoid Dynamics in Eruptive Flares" The Astrophysical Journal. 487. 437-446 (1997)

[Publications] R.Matsumoto: "Formation of a Kinked Alignment of Solar Active Regions" The Astrophysical Journal Letter. 493. L43-L46 (1998)

[Publications] T.Yokoyama: "Two-Dimensional Magnetohydrodynamic Simulation of Chromospheric Evaporation in a Solar Flare Based on Magnetic Reconnection Model" The Astrophysical Journal Letter. 494. L113-L116 (1998)

[Publications] M.Shibata: "Numerical study on the hydrodynamic instability of binary stars in the first post Newtonian approximation" Progress of Theoretical Physics. 98. 1081-1098 (1997)

[Publications] T.Nakamura: "Gravitaional Waves from Coalescing Black Hole Macho Binaries" The Astrophysical Journal Letter. 487. L139-L142 (1997)

[Publications] K.Oohara: "A Way to 3D Numerical Relativity" Progress of Theoretical Physics Supplement. 128. 183-250 (1997)

[Publications] K.Saigo: "Similarity Solution for Formation of A Circumstellar Disk through the Collapse of A Flattened Rotating Cloud" The Astrophysical Journal. 493. 342-350 (1997)

[Publications] T.Hanawa: "Stability of Similarity Solutions for a Gravitationally Contracting Sphere:Convergence to the Larson-Penston Solution" The Astrophysical Journal. 484. 238-244 (1997)

[Publications] F.Nakamura: "Non-axisymmetric Evolution of Dynamically Contracting Disks and Its Implication for Binary Formation" The Astrophysical Journal. 480. 701-704 (1997)

[Publications] T.Tsuribe: "Angular Momentum Transport in Early-formed Objects by Cosmic Background Radiation:Radiation-Hydrodynamical Approach" The Astrophysical Journal. 486. 48-59 (1997)

[Publications] E.L.Turner: "Very Strong Microlensing of Distant Luminous Stars by Relic Massive Black Holes" The Astrophysical Journal. 483. 603-607 (1997)

[Publications] S.Mineshige: "Self-Similar Collapse of Self-Gravitating Viscous Disk" The Astrophysical Journal Letter. 480. 167-172 (1997)

[Publications] S.Hirose: "Disk Accretion onto a Magnetized Young Star and Associated Jet Formation" Publication Astronomical Society of Japan. 49. 389-404 (1997)

[Publications] W.Chou: "Linear and Nonlinear Evolution of Parker Instability of Magnetic Flux Sheets in Co-Rotating Coordinates" Publication Astronomical Society of Japan. 49. 389-404 (1997)

[Publications] M.Den: "New Data Compression for Multi-Dimensional Numerical Simulation" Journal for Academic Computing and Networking. 1. 25-34 (1997)

[Publications] N.Pogorelov, T.Matsuda: "Influence of the interstellar magnetic field direction on the shape of the global heliopause" J.Geophysical Research. 103. 237-245 (1998)

[Publications] H.Yukawa: "Spiral Shocks in 3D Accretion Discs" Monthly Notice of Royal Astronomical Society. 292. 321-330 (1997)

[Publications] N.Pogorelov: "Application of numerical methods to modeling the stellar wind and interstellar medium interaction" Invited to CFD Reviews,John Wiley & Sons,Chichester. (in press). (1998)

観山正見国立天文台, 理論天文学研究系, 教授 (00166191)