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Group Velocity of the Density Waves in Galactic Disks |
| LONG Min1;PENG Qiu-He1,2;LUO Xin-Lian1;CHOU Chih-Kang3 |
| 1Department of Astronomy, Nanjing University, Nanjing, 210093
2Chinese Academy of Sciences-Peking University Joint Beijing Astrophysical Center, Beijing University, Beijing, 100871
3Graduate Institute of Astronomy, National Central University, Chung-Li, 32054, Taiwan, China
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| Cite this article: |
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LONG Min, PENG Qiu-He, LUO Xin-Lian et al 2000 Chin. Phys. Lett. 17 929-931 |
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Abstract This letter is emphasized on the discussion of the group velocity of disturbed galactic density waves (GDW), which is one of the two most insurmountable problems in the density waves theory. In our calculation, we find that the galactic thickness has an important effect on the GDW. The dynamic time scale of GDW in our three-dimensional model can be prominently prolonged, from 36% to 60% contrasting to that of two-dimensional galactic model. However, it is still less than the lifetime of our Galaxy, which means that it is necessary to seek some other physical mechanisms to excite and sustain the GDW.
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| Keywords:
98.35.Hj
98.35.Df
98.35.-a
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Published: 01 December 2000
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| PACS: |
98.35.Hj
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(Spiral arms and galactic disk)
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98.35.Df
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(Kinematics, dynamics, and rotation)
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98.35.-a
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(Characteristics and properties of the Milky Way galaxy)
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