Chin. Phys. Lett.  1999, Vol. 16 Issue (12): 931-933    DOI:
Original Articles |
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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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.


Keywords: 98.35.-a      98.35.Hj     
Published: 01 December 1999
PACS:  98.35.-a (Characteristics and properties of the Milky Way galaxy)  
  98.35.Hj (Spiral arms and galactic disk)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y1999/V16/I12/0931
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