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
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
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.
LI Meng;LUO Xin-Lian;PENG Qiu-He;ZOU Zhi-Gang. A New Method to Determine the Thickness of Spiral Galaxies: Apply to M31[J]. 中国物理快报, 2000, 17(6): 466-468.
LI Meng, LUO Xin-Lian, PENG Qiu-He, ZOU Zhi-Gang. A New Method to Determine the Thickness of Spiral Galaxies: Apply to M31. Chin. Phys. Lett., 2000, 17(6): 466-468.
2000, Vol. 17 
