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Issue A&A
Volume 446, Number 2, February I 2006
Page(s) L5 - L8
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200500225

A&A 446, L5-L8 (2006)
DOI: 10.1051/0004-6361:200500225

Letter

A new method for determining mass-to-light ratios of nearly face-on spiral galaxies

TaoHu1, Qiu-He Peng1, 2, 3 and Ying-He Zhao1

1  Department of Astronomy, Nanjing University, Nanjing 210093, PR China
    e-mail: taohu@nju.edu.cn
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)

Abstract
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 $4.86 \sim 8.99~{M_\odot\,L_\odot ^{-1}}$ and $5.02\sim 6.90~{M_\odot\,L_\odot ^{-1}}$ respective.


Key words: galaxy: disk -- galaxies: fundamental parameters -- galaxies: spiral -- galaxies: structure -- galaxies: individual: NGC 1566, NGC 5247

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