A new method for determining mass-to-light ratios of nearly face-on spiral galaxiesTaoHu1, Qiu-He Peng1, 2, 3 and Ying-He Zhao1
1 Department of Astronomy, Nanjing University, Nanjing 210093, PR China
2 Joint Astrophysics Center of Chinese Academy of Science-Peking University, Beijing 100871, PR China
3 The Open Laboratory of Cosmic Ray and High Energy Astrophysics, Chinese Academy of Science
(Received 12 August 2005 / Accepted 8 December 2005)
Aims.This letter gives a new method for determining mass-to-light ratios of nearly face-on spiral galaxies.
Methods.The method is based on the effective thickness of the galactic disk, the distribution of the vertical velocity dispersion, and the surface brightness of a spiral galaxy.
Results.As examples, the results of the determination of NGC 1566 and NGC 5247 in B-band are presented, and their mass-to-light ratios are and respective.
Key words: galaxy: disk -- galaxies: fundamental parameters -- galaxies: spiral -- galaxies: structure -- galaxies: individual: NGC 1566, NGC 5247
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