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A New Method to Determine the Thickness of Spiral Galaxies: Apply to M31 |
| LI Meng1;LUO Xin-Lian1;PENG Qiu-He1,2;ZOU Zhi-Gang3 |
| 1Department of Astronomy, Nanjing University, Nanjing 210093
2Chinese Academy of Sciences-Peking University Joint Beijing Astrophysical Center, Peking 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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LI Meng, LUO Xin-Lian, PENG Qiu-He et al 2000 Chin. Phys. Lett. 17 466-468 |
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Abstract A new method is presented to determine the thickness of spiral galaxies. Based on the rigorous solution of the Poisson equation for logarithmic density disturbance in three-dimensional spiral galaxies, we have derived an accurate dispersion relation for the stellar and gaseous disk with a finite thickness. From this relation, a new method is put forward here for determining the thickness of galaxies. We apply this way to M31 and get the thickness of about 0.7kpc, which is in good agreement with the previous results.
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| Keywords:
98.35.Hj
98.56.Ne
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Published: 01 June 2000
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| PACS: |
98.35.Hj
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(Spiral arms and galactic disk)
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98.56.Ne
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(Spiral galaxies (M31 and M33))
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