1999 Fiscal Year Annual Research Report

大型計算機シミュレーションによる星・惑星系の形成過程の理論的研究

Research Project

Project/Area Number	10147105
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)	中川義次神戸大学, 理学部, 教授 (30172282) 富阪幸治国立天文台, 理論天文学研究系, 教授 (70183879) 羽部朝男北海道大学, 大学院・理学系研究科, 助教授 (90180926) 松元亮治千葉大学, 理学部, 教授 (00209660) 花輪知幸名古屋大学, 大学院・理学研究科, 助教授 (50172953)
Keywords	数値シミュレーション / 星形成 / 惑星形成 / マゼラン星雲 / 輻射輸送 / 星間ガス雲 / 連星 / 分子雲
Research Abstract	近年の観測技術の進歩によって星の形成過程や惑星系の母体である原始惑星系円盤の物理が、構造論的にも進化論的にも観測的に明らかとなっている。それらの構造や進化の観測的事象から、総括的及び普遍的な星・惑星系の形成論の構築に至るためには、基礎物理学の蓄積に基づいた理論的現象の把握が極めて重要となる。この点で、基礎理論を踏まえた数値シミュレーションの実行は、観測との直接比較検討を可能にする上でも、また天体現象を実験的に把握する上でも、現象の理論的解析に極めて有効である。計画研究の2年度として以下の成果が得られた。 1.回転並びに磁場の効果を考慮した2次元及び3次元の計算機シミュレーションを実行して、星形成過程を解析した。その結果、星の角運動量の起源、動的に収縮する分子雲コアがバー不安定、連鎖的星形成、低密度ガスの熱的不安定性、分子雲の内部速度構造の起源を明らかにした。 2.磁気流体計算の実行によって、星の磁気構造などの解析を進め、局所的な磁気圧優勢領域の形成、磁気ループの浮上と円盤コロナの形成、1/fノイズ的時間変動などを示した。 3.輻射輸送過程を解析し、形成期の原始星と非常に若いT Tauri型星の状態、および形成中の原始惑星系円盤への質量降着ショックについての解析を進めた。 4.質量降着の非常に大きい原始星の進化を調べ、原始星の半径は最大でも太陽半径の50倍程度にしかならないことを示した。 5.ガスが自己重力不安定である矮小銀河における分子雲の形成と進化の数値シミュレーションを行い、観測によく対応する分子雲の分布や質量関数が得られることがわかった。

Research Products
(87 results)

All Other

All Publications (87 results)

[Publications] T. Sano: "Magnetorotational Instability in Protoplanetary Disks. I. On the Global Stability of Weakly Ionized Disks with Ohmic Dissipation"The Astrophysical Journal. 515. 776-786 (1999)
[Publications] S.V.W. Beckwith: "Dust Properties and Assembly of Large Particles in Protoplanetary Disks"Protostars and Planets IV, ed. By V. Manning and A.P. Boss, Univ. of Arizona Press.. (in press). (1999)
[Publications] K.K. Tanaka: "Shock Heating due to Accretion of a Clumpy Cloud onto a Protoplanetary Disk"Icarus. 134. 137-154 (1998)
[Publications] H. Masunaga: "Infall Signatures in Line Spectral Profiles of Protostellar Envelopes"The Astrophysical Journal. 535(in press). (2000)
[Publications] H. Koyama: "Molecular Cloud Formation in Shock-Compressed Layers"The Astrophysical Journal. 533(in press). (2000)
[Publications] H. Uehura: "Does Deuterium enable the formation of primordial brown dwarfs?"The Astrophysical Journal Letter. 531. L91-L94 (2000)
[Publications] H. Masunaga: "A Radiation Hydrodynamic Model for Protostellar Collapse II. The Second Collapse and the Birth of a Protostar"The Astrophysical Journal. 531. 350-365 (2000)
[Publications] N. Kaifu: "The First Light of the Subaru Telescope: A New Infrared Image of the Orion Nebula"Publication Astronomical Society of Japan. 52. 1-8 (2000)
[Publications] T. Tsuribe: "Criteria for Fragmentation of Rotating Isothermal Clouds I: Semianalytic Approach"The Astrophysical Journal. 526. 307-312 (1999)
[Publications] T. Tsuribe: "Criteria for Fragmentation of Rotating Isothermal Clouds Revisited"The Astrophysical Journal. 523. L155-L158 (1999)
[Publications] H. Masunaga: "Does 'T〜1' Terminate the Isothermal Evolution of Collapsing Clouds?"The Astrophysical Journal. 510. 822-827 (1999)
[Publications] T. Nagai: "An Origin of Filamentary Structure in Molecular Clouds"The Astrophysical Journal. 506. 306-322 (1998)
[Publications] T. Sano: "A Saturation Mechanism of Magnetorotational Instability Due to Ohmic Dissipation"The Astrophysical Journal Letter. 506. L57-L60 (1998)
[Publications] H. Masunaga: "A Radiation Hydrodynamical Model for Protostellar Collapse: I. The First Collapse"The Astrophysical Journal. 495. 346-369 (1998)
[Publications] T. Nakamoto: "Spectral Modeling of YSOs"Star Formation 1999, Proceedings of the International Conference, ed. T. Nakamoto (Nobeyama Radio Observatory). 217-220 (1999)
[Publications] N. Kikuchi: "Model Infrared Images and Spectra of Disks around Young Stars"Star Formation 1999, Proceedings of the International Conference, ed. T. Nakamoto (Nobeyama Radio Observatory). 233-234 (1999)
[Publications] K. Ogochi: "The Gravitational Collapse of Filaments: 1D RHD Simulations"Star Formation 1999, Proceedings of the International Conference, ed. T. Nakamoto (Nobeyama Radio Observatory). 193-194 (1999)
[Publications] A. Iida: "Shock Temperature at a Protoplanetary Disk Surface"Star Formation 1999, Proceedings of the International Conference, ed. T. Nakamoto (Nobeyama Radio Observatory). 243-244 (1999)
[Publications] T. Nakamoto: "A 3-D Radiative Transfer Solver using a Massively Parallel Computer"Proceedings of Numerical Astrophysics 1998 (NAP98), ed. by S.M. Miyama, K. Tomisaka & T. Hanawa, Kluwer Academic. 375-378 (1999)
[Publications] K. Ogochi: "Radiation Hydrodynamical Simulations of Gravitational Collapse of Filamentary Gas Clouds"Proceedings of Numerical Astrophysics 1998 (MAP98), ed. by S.M. Miyama, K. Tomisaka & T. Hanawa, Kluwer Academic. 171-172 (1999)
[Publications] N. Kikuchi: "SEDs and IR Images of Disks around YSOs"Proceedings of Numerical Astrophysics 1998 (MAP98), ed. by S.M. Miyama, K. Tomisaka & T. Hanawa, Kluwer Academic. 181-182 (1999)
[Publications] H. Kamaya: "Comments on Alfven Waves and Plasma Drift in a Slightly Ionized Gas"The Astrophysical Journal. 500. 257-261 (1998)
[Publications] K. Omukai: "Evolution of Primordial Protostellar Clouds: Quasi-static Analysis"Progress of Theoretical Physics. 99. 747-761 (1998)
[Publications] T. Nakamura: "Expected EAGLE event rate towards the Magellanic Clouds"Progress of Theoretical Physics. 99. 963-970 (1998)
[Publications] H. Susa: "The Thermal Evolution of the Postshock Layer in Pregalactic Clouds"Progress of Theoretical Physics. 100. 63-77 (1998)
[Publications] M. Yamada: "Fragmentation of Shock Compressed Sheet of Primordial Gas"The Astrophysical Journal. 505. 148-158 (1998)
[Publications] K. Omukai: "Formation of Primordial Protostars"The Astrophysical Journal. 508. 141-150 (1998)
[Publications] R. Nishi: "Thermal and Dynamical Evolution of Primordial Gas Clouds: on the Formation of First Luminous Objects"Progress of Theoretical Physics. 100. 881-903 (1998)
[Publications] T. Shiromizu: "Back Reaction to the Spectrum of Magnetic Field in the Kinetic Dynamo Theory"Progress of Theoretical Physics. 101. 39-45 (1999)
[Publications] K. Omukai: "Photodissociative Regulation of Star Formation in Metal-free Pregalactic Clouds"The Astrophysical Journal. 518. 64-68 (1999)
[Publications] R. Nishi: "Formation and Disruption of Cosmological Low Mass Objects"The Astrophysical Journal Letter. 523. L103-L107 (1999)
[Publications] K. Ioka: "Keplar Rotation Effects on Binary Microlensing Events"Progress of Theoretical Physics. 102. 983-1000 (1999)
[Publications] R. Nishi: "On the Decelerating Shock Instability of Plane-Palallel Stab with Finite Thickness"The Astrophysical Journal. 532(in press). (2000)
[Publications] H. Kamaya: "Dynamical Instability Durign Plasma Drift"The Astrophysical Journal. 533(in press). (2000)
[Publications] M. Tashiro: "On the Thermal Instability in a Contracting Gas Cloud and Formation of a Bound Clusters"The Astrophysical Journal. (in press). (2000)
[Publications] R. Nishi: "Self-Regulation of Star Formation in Low Metallicity Clouds"The astrophysical Journal. 537(in press). (2000)
[Publications] R. Nishi: "Dark Matter Search with Gravitational Microlensing Events"Progress of Theoretical Physics Supplement. 133. 211-231 (1999)
[Publications] H. Fukuda: "The Effect of Self-gravity of Gas on Gas Fueling in Barred Galaxies with a Supermassive Black Hole"The Astrophysical Journal. (in press). (1999)
[Publications] T. Okamoto: "Formation and Evolution of Galactic Halos in Clusters of Galaxies"The Astrophysical Journal. 516. 591 (1999)
[Publications] H. Fukuda: "The effect of a central supermassive black hole on the gas fueling"Monthly Notice of Royal Astronomical Society. 295. 463-474 (1998)
[Publications] A. Nishikawa: "Cooling Flows Induced by Compton Cooling due to Luminous Quasars in Clusters of Galaxie"Monthly Notice of Royal Astronomical Society. 295. 632-640 (1998)
[Publications] H. Saga: "Evolution of X-ray Clusters of Galaxies with Active Protogalaxies"IAU symp. No. 188 Hot Universe, ed by K.Koyama et al., Kluwer Acd. Press. 321-322 (1998)
[Publications] A. Habe: "Cluster of Galaxies in a Flat CHDM universe"IAU symp. No. 188 Hot Universe, ed by K.Koyama et al., Kluwer Acd. Press. 299-300 (1998)
[Publications] T. Nakano: "Star Formation in Magnetic Clouds"The Astrophysical Journal. 494. 587-604 (1998)
[Publications] T. Nakano: "Star Formation: Can There Be a Break in the IMF near 0.1M?"Highlights of Astronomy. 11A. 425-426 (1998)
[Publications] J.-I. Morino: "Reflected Infrared Spectrum of a Massive Protostar in Orion"Nature. 393. 340-342 (1998)
[Publications] M. Momose: "Aperture Synthesis C ^<18> O (J = 1-0) Observations of L1551-IRS 5: Detailed Structure of the Infalling Envelope"The Astrophysical Journal. 504. 314-333 (1998)
[Publications] Y. Aikawa: "Evolution of Molecular Abundances in Protoplanetary Disks with Accretion Flow"The Astrophysical Journal. 519. 705-725 (1999)
[Publications] T. Nakano: "Star Formation in Magnetic Clouds: A Challenge to the Standard Model"Proceedings of the 3rd Cologne-Zermatt Symposium, eds. by V. Ossenkopf, et al. (GCA-Verlag, Herdecke). 257-260 (1999)
[Publications] T. Nakano: "Star Formation in Magnetic Clouds"Star Formation 1999, Proceedings of the International Conference, ed. T. Nakamoto (Nobeyama Radio Observatory). 123-128 (1999)
[Publications] T. Nakano: "Evolution of Protostars Accreting Mass at Very High Rates: Is Orion IRc2 a Huge Protostar?"The Astrophysical Journal. 534(in press). (2000)
[Publications] T. Hanawa: "Stability of a Dynamically Collapsing Gas Sphere"Publication Astronomical Society of Japan. 52(in press). (2000)
[Publications] N. Fukuda: "Sequential Star Formation Triggered by Expansion of an H II Region"The Astrophysical Journal. 533(in press). (2000)
[Publications] K. Saigo: "Collapse of Rotating Gas Cloud and Formation of Protostellar Disk: Effects of Temperature Change During Collapse"The Astrophysical Journal. 531(in press). (2000)
[Publications] T. Hanawa: "Growth of a Bar Perturbation during Isothermal Collapse"The Astrophysical Journal. 521. 703-707 (1999)
[Publications] T. Matsumoto: "Bar and Disk Formation in Gravitationally Collapsing Clouds: Implications for Binary Formation"The Astrophysical Journal. 521. 659-670 (1999)
[Publications] N. Fukuda: "Gravitational and Parametric Instabilities in the Alfven Wave Traveling Interstellar Medium"The Astrophysical Journal. 517. 226-241 (1999)
[Publications] K. Nobuta: "Jets from Time-Dependent Accretion Flows onto a Black Hole"The Astrophysical Journal. 510. 614-630 (1999)
[Publications] F. Nakamura: "Collapse of Isothermal Magnetized Clouds: Universality of Self-similar Collapse"The Astrophysical Journal. 510. 274-290 (1999)
[Publications] T. Kawachi: "Gravitational Collapse of Filamentary Clouds"Publiction Astronomical Society of Japan. 50. 577-586 (1998)
[Publications] Y. Nakajima: "Clustering of PreMain-Sequence Stars in the Orion, Ophiuchus, Chamaeleon, Vela, and Lupus Star-forming Regions"The Astrophysical Journal. 497. 721-735 (1998)
[Publications] K. Tomisaka: "The Evolution of the Angular Momentum Distribution during Star Formation"The Astrophysical Journal Letter. 528. L41-L44 (2000)
[Publications] S. Ogino: "Gravitational Collapse of Spherical Isothermal Clouds"Publication Astronomical Society of Japan. 51. 637-651 (1999)
[Publications] K. Tomisaka: "Collapse-Driven Outflow in Star-Forming Molecular Cores"Star Formation 1999, Proceedings of the International Conference, ed. T. Nakamoto (Nobeyama Radio Observatory). 197-198 (1999)
[Publications] K. Tomisaka: "Gravitational Contraction of Magnetized Clouds"Proceedings of Numerical Astrophysics 1998 (NAP98), ed. by S.M. Miyama, K. Tomisaka & T. Hanawa, Kluwer Academic. 141-150 (1999)
[Publications] F. Nakamura: "Collapse of Isothermal Magnetized Clouds: Universality of Self-similar Collapse"The Astrophysical Journal. 510. 274-290 (1999)
[Publications] K. Tomisaka: "Collapse-Driven Outflow in Star-Forming Molecular Cores"The Astrophysical Journal. 502. 163-167 (1998)
[Publications] K. Tomisaka: "Superbubbles in Magnetized Interstellar Media: Blowout or Confinement?"Monthly Notice of Royal Astronomical Society. 298. 797-810 (1998)
[Publications] M. Machida: "Global Simulations of Differentially Rotating Magnetized Disks: Formation of Low-βFilaments and Structured Coronae"The Astrophysical Journal Letter. 532. 67-70 (2000)
[Publications] T. Kawaguchi: "Temporal 1/f^α Fluctuations from Fractal Magnetic Fields in Black-Hole Accretion Flow"Publication Astronomical Society of Japan. 52. L1-L4 (2000)
[Publications] W. Chou: "Magnetotelluric Modelings using a Parallel Computational Scheme (I) Code Development and Preliminary Results"Computer Physics Communications. (in press). (2000)
[Publications] W. Chuo: "Dynamics of the Parker-Jeans Instability in a Galactic Gaseous Disk"The Astrophysical Journal. 537(in press). (2000)
[Publications] M. Umekawa: "Self-Gravitational Instability of an Isothermal Gaseous Slab under High External Pressure"Publication Astronomical Society of Japan. 51. 625-636 (1999)
[Publications] S. Tanuma: "Magnetic Reconnection as the Origin of Galactic-Ridge X-Ray Emission"Publiction Astronomical Society of Japan. 51. 161-172 (1999)
[Publications] W. Chuo: "Dynamics of Local Isolated Magnetic Flux Tubes in a Rapidly Rotating Stellar Atmosphere"Publication Astronomical Society of Japan. 51. 103-113 (1999)
[Publications] T. Kudoh: "Numerical MHD Simulation of Astrophysical Problems by using CIP-MOCCT Method"Computational Fluid Dynamics Journal. 8. 56-68 (1999)
[Publications] T. Kudoh: "Magnetically Driven Jets from Accretion Disks. III. 2,5-dimensional Nonsteady Simulations for Thick Disk Case"The Astrophysical Journal. 508. 186-199 (1998)
[Publications] R. Matsumoto: "Computational Magnetohydrodynamics of Turbulence, Dynamos, and Jet Formation in Differentially Rotating Astrophysical Disks"Progress of Theoretical Physics Supplement. (in press). (2000)
[Publications] T. Ogawa: "Hydrodynamical Simulations using a Fully Threaded Tree"Progress of Theoretical Physics Supplement. (in press). (2000)
[Publications] R. Matsumoto: "Formation of Localized Strongly Magnetized Regions in Galaxies and Clusters of Galaxies"Advances in Space Research. 25. 499-504 (2000)
[Publications] Y. Kato: "Flares and Outflows around a Weakly Magnetized Neutron Star"Astronomische Naturichten. 320. 367-367 (1999)
[Publications] R. Matsumoto: "Global Three-Dimensional MHD Simulations of Accretion Disks and Jet Formation in AGNs"Advances in Space Research. 23. 1109-1113 (1999)
[Publications] T. Kudoh: "Magnetically Driven Jets from Accretion Disks: The Effect of Magneto-rotational Instability"Advances in Space Reaearch. 23. 1101-1104 (1999)
[Publications] T. Kuwabara: "Magnetohydrodynamic Simulations of Magnetically Driven Mass Accretion in Active Galactic Nuclei"Advances in Space Research. 23. 1105-1108 (1999)
[Publications] R. Matsumoto: "Jets from Magnetized Accretion Disks"Geophysical Monograph. 111. 293-300 (1999)
[Publications] S.M. Miyama: "NUMERICAL ASTROPHYSICS"Kluwer Academic Publishers. 438 (1999)
[Publications] T. Nakamoto: "Star Formation 1999"Nobeyama Radio Observatory. (2000)

1999 Fiscal Year Annual Research Report

大型計算機シミュレーションによる星・惑星系の形成過程の理論的研究

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] T. Sano: "Magnetorotational Instability in Protoplanetary Disks. I. On the Global Stability of Weakly Ionized Disks with Ohmic Dissipation"The Astrophysical Journal. 515. 776-786 (1999)

[Publications] S.V.W. Beckwith: "Dust Properties and Assembly of Large Particles in Protoplanetary Disks"Protostars and Planets IV, ed. By V. Manning and A.P. Boss, Univ. of Arizona Press.. (in press). (1999)

[Publications] K.K. Tanaka: "Shock Heating due to Accretion of a Clumpy Cloud onto a Protoplanetary Disk"Icarus. 134. 137-154 (1998)

[Publications] H. Masunaga: "Infall Signatures in Line Spectral Profiles of Protostellar Envelopes"The Astrophysical Journal. 535(in press). (2000)

[Publications] H. Koyama: "Molecular Cloud Formation in Shock-Compressed Layers"The Astrophysical Journal. 533(in press). (2000)

[Publications] H. Uehura: "Does Deuterium enable the formation of primordial brown dwarfs?"The Astrophysical Journal Letter. 531. L91-L94 (2000)

[Publications] H. Masunaga: "A Radiation Hydrodynamic Model for Protostellar Collapse II. The Second Collapse and the Birth of a Protostar"The Astrophysical Journal. 531. 350-365 (2000)

[Publications] N. Kaifu: "The First Light of the Subaru Telescope: A New Infrared Image of the Orion Nebula"Publication Astronomical Society of Japan. 52. 1-8 (2000)

[Publications] T. Tsuribe: "Criteria for Fragmentation of Rotating Isothermal Clouds I: Semianalytic Approach"The Astrophysical Journal. 526. 307-312 (1999)

[Publications] T. Tsuribe: "Criteria for Fragmentation of Rotating Isothermal Clouds Revisited"The Astrophysical Journal. 523. L155-L158 (1999)

[Publications] H. Masunaga: "Does 'T〜1' Terminate the Isothermal Evolution of Collapsing Clouds?"The Astrophysical Journal. 510. 822-827 (1999)

[Publications] T. Nagai: "An Origin of Filamentary Structure in Molecular Clouds"The Astrophysical Journal. 506. 306-322 (1998)

[Publications] T. Sano: "A Saturation Mechanism of Magnetorotational Instability Due to Ohmic Dissipation"The Astrophysical Journal Letter. 506. L57-L60 (1998)

[Publications] H. Masunaga: "A Radiation Hydrodynamical Model for Protostellar Collapse: I. The First Collapse"The Astrophysical Journal. 495. 346-369 (1998)

[Publications] T. Nakamoto: "Spectral Modeling of YSOs"Star Formation 1999, Proceedings of the International Conference, ed. T. Nakamoto (Nobeyama Radio Observatory). 217-220 (1999)

[Publications] N. Kikuchi: "Model Infrared Images and Spectra of Disks around Young Stars"Star Formation 1999, Proceedings of the International Conference, ed. T. Nakamoto (Nobeyama Radio Observatory). 233-234 (1999)

[Publications] K. Ogochi: "The Gravitational Collapse of Filaments: 1D RHD Simulations"Star Formation 1999, Proceedings of the International Conference, ed. T. Nakamoto (Nobeyama Radio Observatory). 193-194 (1999)

[Publications] A. Iida: "Shock Temperature at a Protoplanetary Disk Surface"Star Formation 1999, Proceedings of the International Conference, ed. T. Nakamoto (Nobeyama Radio Observatory). 243-244 (1999)

[Publications] T. Nakamoto: "A 3-D Radiative Transfer Solver using a Massively Parallel Computer"Proceedings of Numerical Astrophysics 1998 (NAP98), ed. by S.M. Miyama, K. Tomisaka & T. Hanawa, Kluwer Academic. 375-378 (1999)

[Publications] K. Ogochi: "Radiation Hydrodynamical Simulations of Gravitational Collapse of Filamentary Gas Clouds"Proceedings of Numerical Astrophysics 1998 (MAP98), ed. by S.M. Miyama, K. Tomisaka & T. Hanawa, Kluwer Academic. 171-172 (1999)

[Publications] N. Kikuchi: "SEDs and IR Images of Disks around YSOs"Proceedings of Numerical Astrophysics 1998 (MAP98), ed. by S.M. Miyama, K. Tomisaka & T. Hanawa, Kluwer Academic. 181-182 (1999)

[Publications] H. Kamaya: "Comments on Alfven Waves and Plasma Drift in a Slightly Ionized Gas"The Astrophysical Journal. 500. 257-261 (1998)

[Publications] K. Omukai: "Evolution of Primordial Protostellar Clouds: Quasi-static Analysis"Progress of Theoretical Physics. 99. 747-761 (1998)

[Publications] T. Nakamura: "Expected EAGLE event rate towards the Magellanic Clouds"Progress of Theoretical Physics. 99. 963-970 (1998)

[Publications] H. Susa: "The Thermal Evolution of the Postshock Layer in Pregalactic Clouds"Progress of Theoretical Physics. 100. 63-77 (1998)

[Publications] M. Yamada: "Fragmentation of Shock Compressed Sheet of Primordial Gas"The Astrophysical Journal. 505. 148-158 (1998)

[Publications] K. Omukai: "Formation of Primordial Protostars"The Astrophysical Journal. 508. 141-150 (1998)

[Publications] R. Nishi: "Thermal and Dynamical Evolution of Primordial Gas Clouds: on the Formation of First Luminous Objects"Progress of Theoretical Physics. 100. 881-903 (1998)

[Publications] T. Shiromizu: "Back Reaction to the Spectrum of Magnetic Field in the Kinetic Dynamo Theory"Progress of Theoretical Physics. 101. 39-45 (1999)

[Publications] K. Omukai: "Photodissociative Regulation of Star Formation in Metal-free Pregalactic Clouds"The Astrophysical Journal. 518. 64-68 (1999)

[Publications] R. Nishi: "Formation and Disruption of Cosmological Low Mass Objects"The Astrophysical Journal Letter. 523. L103-L107 (1999)

[Publications] K. Ioka: "Keplar Rotation Effects on Binary Microlensing Events"Progress of Theoretical Physics. 102. 983-1000 (1999)

[Publications] R. Nishi: "On the Decelerating Shock Instability of Plane-Palallel Stab with Finite Thickness"The Astrophysical Journal. 532(in press). (2000)

[Publications] H. Kamaya: "Dynamical Instability Durign Plasma Drift"The Astrophysical Journal. 533(in press). (2000)

[Publications] M. Tashiro: "On the Thermal Instability in a Contracting Gas Cloud and Formation of a Bound Clusters"The Astrophysical Journal. (in press). (2000)

[Publications] R. Nishi: "Self-Regulation of Star Formation in Low Metallicity Clouds"The astrophysical Journal. 537(in press). (2000)

[Publications] R. Nishi: "Dark Matter Search with Gravitational Microlensing Events"Progress of Theoretical Physics Supplement. 133. 211-231 (1999)

[Publications] H. Fukuda: "The Effect of Self-gravity of Gas on Gas Fueling in Barred Galaxies with a Supermassive Black Hole"The Astrophysical Journal. (in press). (1999)

[Publications] T. Okamoto: "Formation and Evolution of Galactic Halos in Clusters of Galaxies"The Astrophysical Journal. 516. 591 (1999)

[Publications] H. Fukuda: "The effect of a central supermassive black hole on the gas fueling"Monthly Notice of Royal Astronomical Society. 295. 463-474 (1998)

[Publications] A. Nishikawa: "Cooling Flows Induced by Compton Cooling due to Luminous Quasars in Clusters of Galaxie"Monthly Notice of Royal Astronomical Society. 295. 632-640 (1998)

[Publications] H. Saga: "Evolution of X-ray Clusters of Galaxies with Active Protogalaxies"IAU symp. No. 188 Hot Universe, ed by K.Koyama et al., Kluwer Acd. Press. 321-322 (1998)

[Publications] A. Habe: "Cluster of Galaxies in a Flat CHDM universe"IAU symp. No. 188 Hot Universe, ed by K.Koyama et al., Kluwer Acd. Press. 299-300 (1998)

[Publications] T. Nakano: "Star Formation in Magnetic Clouds"The Astrophysical Journal. 494. 587-604 (1998)

[Publications] T. Nakano: "Star Formation: Can There Be a Break in the IMF near 0.1M?"Highlights of Astronomy. 11A. 425-426 (1998)

[Publications] J.-I. Morino: "Reflected Infrared Spectrum of a Massive Protostar in Orion"Nature. 393. 340-342 (1998)

[Publications] M. Momose: "Aperture Synthesis C ^<18> O (J = 1-0) Observations of L1551-IRS 5: Detailed Structure of the Infalling Envelope"The Astrophysical Journal. 504. 314-333 (1998)

[Publications] Y. Aikawa: "Evolution of Molecular Abundances in Protoplanetary Disks with Accretion Flow"The Astrophysical Journal. 519. 705-725 (1999)

[Publications] T. Nakano: "Star Formation in Magnetic Clouds: A Challenge to the Standard Model"Proceedings of the 3rd Cologne-Zermatt Symposium, eds. by V. Ossenkopf, et al. (GCA-Verlag, Herdecke). 257-260 (1999)

[Publications] T. Nakano: "Star Formation in Magnetic Clouds"Star Formation 1999, Proceedings of the International Conference, ed. T. Nakamoto (Nobeyama Radio Observatory). 123-128 (1999)

[Publications] T. Nakano: "Evolution of Protostars Accreting Mass at Very High Rates: Is Orion IRc2 a Huge Protostar?"The Astrophysical Journal. 534(in press). (2000)

[Publications] T. Hanawa: "Stability of a Dynamically Collapsing Gas Sphere"Publication Astronomical Society of Japan. 52(in press). (2000)

[Publications] N. Fukuda: "Sequential Star Formation Triggered by Expansion of an H II Region"The Astrophysical Journal. 533(in press). (2000)

[Publications] K. Saigo: "Collapse of Rotating Gas Cloud and Formation of Protostellar Disk: Effects of Temperature Change During Collapse"The Astrophysical Journal. 531(in press). (2000)

[Publications] T. Hanawa: "Growth of a Bar Perturbation during Isothermal Collapse"The Astrophysical Journal. 521. 703-707 (1999)

[Publications] T. Matsumoto: "Bar and Disk Formation in Gravitationally Collapsing Clouds: Implications for Binary Formation"The Astrophysical Journal. 521. 659-670 (1999)

[Publications] N. Fukuda: "Gravitational and Parametric Instabilities in the Alfven Wave Traveling Interstellar Medium"The Astrophysical Journal. 517. 226-241 (1999)

[Publications] K. Nobuta: "Jets from Time-Dependent Accretion Flows onto a Black Hole"The Astrophysical Journal. 510. 614-630 (1999)

[Publications] F. Nakamura: "Collapse of Isothermal Magnetized Clouds: Universality of Self-similar Collapse"The Astrophysical Journal. 510. 274-290 (1999)

[Publications] T. Kawachi: "Gravitational Collapse of Filamentary Clouds"Publiction Astronomical Society of Japan. 50. 577-586 (1998)

[Publications] Y. Nakajima: "Clustering of PreMain-Sequence Stars in the Orion, Ophiuchus, Chamaeleon, Vela, and Lupus Star-forming Regions"The Astrophysical Journal. 497. 721-735 (1998)

[Publications] K. Tomisaka: "The Evolution of the Angular Momentum Distribution during Star Formation"The Astrophysical Journal Letter. 528. L41-L44 (2000)

[Publications] S. Ogino: "Gravitational Collapse of Spherical Isothermal Clouds"Publication Astronomical Society of Japan. 51. 637-651 (1999)

[Publications] K. Tomisaka: "Collapse-Driven Outflow in Star-Forming Molecular Cores"Star Formation 1999, Proceedings of the International Conference, ed. T. Nakamoto (Nobeyama Radio Observatory). 197-198 (1999)

[Publications] K. Tomisaka: "Gravitational Contraction of Magnetized Clouds"Proceedings of Numerical Astrophysics 1998 (NAP98), ed. by S.M. Miyama, K. Tomisaka & T. Hanawa, Kluwer Academic. 141-150 (1999)

[Publications] F. Nakamura: "Collapse of Isothermal Magnetized Clouds: Universality of Self-similar Collapse"The Astrophysical Journal. 510. 274-290 (1999)

[Publications] K. Tomisaka: "Collapse-Driven Outflow in Star-Forming Molecular Cores"The Astrophysical Journal. 502. 163-167 (1998)

[Publications] K. Tomisaka: "Superbubbles in Magnetized Interstellar Media: Blowout or Confinement?"Monthly Notice of Royal Astronomical Society. 298. 797-810 (1998)

[Publications] M. Machida: "Global Simulations of Differentially Rotating Magnetized Disks: Formation of Low-βFilaments and Structured Coronae"The Astrophysical Journal Letter. 532. 67-70 (2000)

[Publications] T. Kawaguchi: "Temporal 1/f^α Fluctuations from Fractal Magnetic Fields in Black-Hole Accretion Flow"Publication Astronomical Society of Japan. 52. L1-L4 (2000)

[Publications] W. Chou: "Magnetotelluric Modelings using a Parallel Computational Scheme (I) Code Development and Preliminary Results"Computer Physics Communications. (in press). (2000)

[Publications] W. Chuo: "Dynamics of the Parker-Jeans Instability in a Galactic Gaseous Disk"The Astrophysical Journal. 537(in press). (2000)

[Publications] M. Umekawa: "Self-Gravitational Instability of an Isothermal Gaseous Slab under High External Pressure"Publication Astronomical Society of Japan. 51. 625-636 (1999)

[Publications] S. Tanuma: "Magnetic Reconnection as the Origin of Galactic-Ridge X-Ray Emission"Publiction Astronomical Society of Japan. 51. 161-172 (1999)

[Publications] W. Chuo: "Dynamics of Local Isolated Magnetic Flux Tubes in a Rapidly Rotating Stellar Atmosphere"Publication Astronomical Society of Japan. 51. 103-113 (1999)

観山正見国立天文台, 理論天文学研究系, 教授 (00166191)