Collective Instabilities of Self-Gravitating Systems. II : Instabilities Due to Temperature Anisotropy

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概要

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• The instability modes of rotating self-gravitating systems are investigated On the assumption of infinitely long cylinder. The systems under consideration are a collisionless stellar system with anisotropic velocity dispersion and a gaseous system with anisotropic pressure. In the collisionless stellar system, the Jeans instability mode and the Harris instability mode exist. The dispersion relation is solved numerically and the following results are obtained : the Harris instability occurs even in the region where Wu did not treat, and although its growth rate amounts to the order of angular velocity of the system for sufficient anisotropy, the Harris instability always accompanies the Jeans instability and the latter is always greater than the former in growth rate. In the gaseous system exist the Jeans instability mode and a certain overstable mode, which are different from the Harris instability mode. It is shown that the overstable mode occurs due to coupling of modes. In relation to these results, some problems in galactic structure are discussed.

• 理論物理学刊行会の論文
• 1975-05-25

著者

• Nakamura Takashi

  Department of Cardiology, Saiseikai Shigaken Hospital

• IKEUCHI Satoru

  Department of Astrophysics, Nagoya University

• Ikeuchi Satoru

  Department Of Physics Kyoto University

• Ikeuchi Satoru

  Department Of Astrophysics Nagoya University

• TAKAHARA Fumio

  Department of Earth and Space Science, Graduate School of Science, Osaka University

• Takahara Fumio

  Department Of Physics Kyoto University

• Takahara Fumio

  Department Of Earth And Space Science Graduate School Of Science Osaka University

• Nakamura Takashi

  Department Of Cardiology Saiseikai Shiga Hospital

• Nakamura Takashi

  Department Of Physics Kyoto University

• TAKAHARA Fumio

  Department of Physics, Faculty of Science, Kyoto University

• IKEUCHI Satoru

  Department of Physics, Faculty of Science, Kyoto University

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