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Disk Stability of the Milky Way Near the Sun |
| LUO Xin-lian1;PENG Qiu-he1,2 |
| 1Department of Astronomy, Nanjing University, Nanjing 210093
2Chinese Academy of Sciences-Peking University Joint Beijing Astrophysical Center, Beijing University, Beijing 100871
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| Cite this article: |
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LUO Xin-lian, PENG Qiu-he 1999 Chin. Phys. Lett. 16 931-933 |
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Abstract By solving Poisson's equation for logarithmic density disturbance in three-dimensional (3D) spiral galaxies, the disturbed potential can be given on the disk. Combining it with the corresponding dispersion relation, the local gravitational stability of our galaxy is discussed here. We have generalized the Toomre's stability criterion to the more realistic 3D galaxy models. The generalized Toomre's parameter Q near the sun is 2.08 or 2.20 for two or four armed spiral galaxy models, respectively.
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| Keywords:
98.35.-a
98.35.Hj
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Published: 01 December 1999
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| PACS: |
98.35.-a
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(Characteristics and properties of the Milky Way galaxy)
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98.35.Hj
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(Spiral arms and galactic disk)
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