Stellar Mass-to-Light Ratios and the Tully-Fisher relation

Details Stellar Mass-to-Light Ratios and the Tully-Fisher relation Stellar Mass-to-Light Ratios and the Tully-Fisher relation

2000-08-03

arxiv.org/abs/astro-ph/0008056v1

Astronomy and Astrophysics

Astrophysics

2 pages, 3 figures. To appear in ASP Conference Series, "Galaxy Disks and Disk Galaxies", J.G. Funes S.J. and E.M. Corsini, ed

Scientific paper

We use spiral galaxy evolution models to argue that there are substantial variations in stellar mass-to-light ratio (M/L) within and among galaxies. Our models show a strong correlation between stellar M/L and galaxy color. We compare the colors and maximum-disk M/L values of a sample of galaxies to the model color-M/L relation, finding that a Salpeter IMF is too massive but that an IMF with fewer low mass stars fits the observations well. Applying our color-M/L relation to the Tully-Fisher (TF) relation, we find a stellar mass TF-relation that is independent of originating passband. Adding the HI gas mass, we find that the maximum slope of the baryonic TF-relation is 3.5.

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