1993 Fiscal Year Annual Research Report

遠宇宙で何が起こっているか?

Research Project

Project/Area Number	05302015
Research Institution	Osaka University
Principal Investigator	郷田直輝大阪大学, 理学部, 助教授 (50202073)
Co-Investigator(Kenkyū-buntansha)	須藤靖東京大学, 理学部, 助教授 (20206569) 吉井譲国立天文台, 位置天文・天体力学研究系, 助教授 (00158388) 有本信雄東京大学, 理学部, 助教授 (60242096) 二間瀬敏史弘前大学, 理学部, 教授 (20209141) 高原文郎東京都立大学, 理学部, 教授 (20154891)
Keywords	宇宙の大規模構造 / 原始銀河 / クェーサー / 銀河・銀河団 / 重力レンズ / 宇宙黒体背景輻射 / 暗黒物質 / 宇宙パラメーター
Research Abstract	本年度は研究分担者が、各人のテーマを持ち寄り、各々の天体現象の物理的背景について総合的な検討を行った。また、分担者と研究協力者が集まって全体的な検討会も行った。具体的には、 (1)さまざまな宇宙モデルのもとで、重力レンズ、クェーサー、原始銀河、宇宙黒体輻射、銀河内相互作用などの、遠宇宙の天体現象の各々について、そのモデル、宇宙進化との関係、観測上のバイアスを検討したが、さらに現在も研究が進行中である。 (2)宇宙モデルと密度ゆらぎの関係、初代の天体は何で、いつ形成されたか、その後の相互作用でどのように変形されたか、観測結果は何を意味しているかなど、全体の宇宙論的関連を検討した。これらはいずれも、個々の問題での分担者間の共同研究によって進められた。今後は、いままでの研究成果をもとに、いわゆる宇宙の構造形成の標準モデルの再検討を中心に行っていく。具体的には、 (1)周期変化するハッブル定数や宇宙項、暗黒物質の崩壊等、一般相対論の枠組み内でより多様な可能性を探る。 (2)z>5での天体形成という早期の構造形成の条件を調べ、初期宇宙のゆらぎへの制限を与える。 (3)z>3での遠宇宙の観測可能性を検討する。といった研究内容を計画しており、現在も解析が進行中である。

Research Products

(22 results)

All Other

All Publications (22 results)

[Publications] Asao Habe: "Rapid Gas Supply to a Galactic Center by Self-Gravitational instalility of Gas in a Weak Barred Potential and the Star Burst" Proceedings of EIPC(Elba)Workshop,Cambridge Univercity Press (発表予定). (1994)
[Publications] Haruhiko Ueda: "Clusters and Groups of Galaxies as Cosmological Probes" Astrophysical Journal. 408. 3-16 (1993)
[Publications] Nobuyoshi Makino: "X-ray Gas Mass Fraction in the Shapley Supercluster and its Implication on the Cosmological Baryon Density Parameter" Publications of the Astronomical Society of Japan. 45. L13-L19 (1993)
[Publications] Yasushi Suto: "Exploring Nonlinear Gravitational Clustering Phenomena with Cosmological N-body Simulations" Progress of Theoretical Physics. 90. 1173-1228 (1993)
[Publications] Toshio Tsuchiya: "Spectral Analysis of the Stochastic Orbits in Triaxial Stellar Systems with Figure Rotation" Progress of Theoretical Physics. 89. 793-808 (1993)
[Publications] Naoteru Gouda: "Lyapunov Analysis of Stable Chaos in Self-Gravitating Many Body Systems" Proceedings of the workshop“Ergodic Concepts in Stellar Pynamics"Springer-Verlag. (発表予定). (1994)
[Publications] Naoteru Gouda: "Angular Correlation Function of the CMB Anisotropy on Large-Scales in an Open Universe" Proceedings of Yamada Conference XXXVII,Universal Academy Press,Inc.(発表予定). (1994)
[Publications] Shin Sasaki: "A Simple Model of Cosmological Reionization" Progress of Theoretical Physics. 90. 85-96 (1993)
[Publications] Shin Sasaki: "A Correct Treatment of the Stimulated Process in Cosmic Recombination" Publication of the Astronomical Society of Japan. 45. 655-659 (1993)
[Publications] Shin Sasaki: "Cosmological Reionization Caused by Structure Formation" Progress of Theoretical Physics. (発表予定). (1994)
[Publications] P.Hogan: "Some High Frequency Spherical Gravitational Waves" Journal of Mathematical Physics. 34. 154-169 (1993)
[Publications] Toshifumi Futamase: "General Relativistic Description of a Realistic Inhomogeneous Universe" Progress of Theoretical Physics. 89. 581-597 (1993)
[Publications] J.Kuroiwa: "A Treatment of General Relativistic Effects in Quantum Interence" Physics Letter A. 182. 330-334 (1993)
[Publications] Misao Sasaki: "Implications of the COBE-DMR and South-Pole Experiments on CMB Anisotroples to Inflationary Cosmology" Progress of Theoretical Physics. 89. 1183-1191 (1993)
[Publications] Takahiro Tanaka: "Gravitational Wave Induced by a Particle Orbiting around a Schuarzschild Black Hole" Progress of Theoretical Physics. 90. 65-83 (1993)
[Publications] Misao Sasaki: "Cosmological Gravitational Lens Equation-Its Validity and Limitation" Progress of Theoretical Physics. 90. 753-781 (1993)
[Publications] Nobuo Arimoto: "Stellar Population Synthesis:Application to Galactic Bulges" IAU Symposium No.153,Galactic Bulge. 153. 133-149 (1993)
[Publications] Yuzuru Yoshii: "Detection and Selection Effects in Observations of Faint Galaxies" Astrophysical Journal. 403. 552-566 (1993)
[Publications] Yuzuru Yoshii: "On the Angular Correlation Function of Faint Galaxies" Astrophysical Journal. 414. 431-435 (1993)
[Publications] B.F.Roukewa: "The Failure of Simple Merging Models to Save a Flat,Ω_0=1 Universe" Astrophysical Journal Letters. 418. L1-L4 (1993)
[Publications] K.Wada: "Effects of Star bursts or Structure of Young Galaxies" Monthly Notice of Royal Astrononical Society. (発表予定). (1994)
[Publications] Asao Habe: "Formation and Evolution of X-ray Clusters of Galaxies in Cold Dark Matter Universe" Proceedings of Yamada Conference XXXVII,Universal Academic Press Inc.(発表予定). (1994)

1993 Fiscal Year Annual Research Report

遠宇宙で何が起こっているか?

Principal Investigator

郷田 直輝 大阪大学, 理学部, 助教授 (50202073)

Research Products

[Publications] Asao Habe: "Rapid Gas Supply to a Galactic Center by Self-Gravitational instalility of Gas in a Weak Barred Potential and the Star Burst" Proceedings of EIPC(Elba)Workshop,Cambridge Univercity Press (発表予定). (1994)

[Publications] Haruhiko Ueda: "Clusters and Groups of Galaxies as Cosmological Probes" Astrophysical Journal. 408. 3-16 (1993)

[Publications] Nobuyoshi Makino: "X-ray Gas Mass Fraction in the Shapley Supercluster and its Implication on the Cosmological Baryon Density Parameter" Publications of the Astronomical Society of Japan. 45. L13-L19 (1993)

[Publications] Yasushi Suto: "Exploring Nonlinear Gravitational Clustering Phenomena with Cosmological N-body Simulations" Progress of Theoretical Physics. 90. 1173-1228 (1993)

[Publications] Toshio Tsuchiya: "Spectral Analysis of the Stochastic Orbits in Triaxial Stellar Systems with Figure Rotation" Progress of Theoretical Physics. 89. 793-808 (1993)

[Publications] Naoteru Gouda: "Lyapunov Analysis of Stable Chaos in Self-Gravitating Many Body Systems" Proceedings of the workshop“Ergodic Concepts in Stellar Pynamics"Springer-Verlag. (発表予定). (1994)

[Publications] Naoteru Gouda: "Angular Correlation Function of the CMB Anisotropy on Large-Scales in an Open Universe" Proceedings of Yamada Conference XXXVII,Universal Academy Press,Inc.(発表予定). (1994)

[Publications] Shin Sasaki: "A Simple Model of Cosmological Reionization" Progress of Theoretical Physics. 90. 85-96 (1993)

[Publications] Shin Sasaki: "A Correct Treatment of the Stimulated Process in Cosmic Recombination" Publication of the Astronomical Society of Japan. 45. 655-659 (1993)

[Publications] Shin Sasaki: "Cosmological Reionization Caused by Structure Formation" Progress of Theoretical Physics. (発表予定). (1994)

[Publications] P.Hogan: "Some High Frequency Spherical Gravitational Waves" Journal of Mathematical Physics. 34. 154-169 (1993)

[Publications] Toshifumi Futamase: "General Relativistic Description of a Realistic Inhomogeneous Universe" Progress of Theoretical Physics. 89. 581-597 (1993)

[Publications] J.Kuroiwa: "A Treatment of General Relativistic Effects in Quantum Interence" Physics Letter A. 182. 330-334 (1993)

[Publications] Misao Sasaki: "Implications of the COBE-DMR and South-Pole Experiments on CMB Anisotroples to Inflationary Cosmology" Progress of Theoretical Physics. 89. 1183-1191 (1993)

[Publications] Takahiro Tanaka: "Gravitational Wave Induced by a Particle Orbiting around a Schuarzschild Black Hole" Progress of Theoretical Physics. 90. 65-83 (1993)

[Publications] Misao Sasaki: "Cosmological Gravitational Lens Equation-Its Validity and Limitation" Progress of Theoretical Physics. 90. 753-781 (1993)

[Publications] Nobuo Arimoto: "Stellar Population Synthesis:Application to Galactic Bulges" IAU Symposium No.153,Galactic Bulge. 153. 133-149 (1993)

[Publications] Yuzuru Yoshii: "Detection and Selection Effects in Observations of Faint Galaxies" Astrophysical Journal. 403. 552-566 (1993)

[Publications] Yuzuru Yoshii: "On the Angular Correlation Function of Faint Galaxies" Astrophysical Journal. 414. 431-435 (1993)

[Publications] B.F.Roukewa: "The Failure of Simple Merging Models to Save a Flat,Ω_0=1 Universe" Astrophysical Journal Letters. 418. L1-L4 (1993)

[Publications] K.Wada: "Effects of Star bursts or Structure of Young Galaxies" Monthly Notice of Royal Astrononical Society. (発表予定). (1994)

[Publications] Asao Habe: "Formation and Evolution of X-ray Clusters of Galaxies in Cold Dark Matter Universe" Proceedings of Yamada Conference XXXVII,Universal Academic Press Inc.(発表予定). (1994)

郷田直輝大阪大学, 理学部, 助教授 (50202073)