Mass-to-Light ratio, Initial Mass Function and chemical evolution in disc galaxies

Details Mass-to-Light ratio, Initial Mass Function and chemical evolution in disc galaxies Mass-to-Light ratio, Initial Mass Function and chemical evolution in disc galaxies

2004-02-18

arxiv.org/abs/astro-ph/0402427v1

Astronomy and Astrophysics

Astrophysics

4 pages, 6 colour figures. To appear on PASA (refereed proceedings of Galactic ChemoDynamics V, B.K. Gibson and D. Kawata eds.

Scientific paper

Cosmological simulations of disc galaxy formation, when compared to the observed Tully-Fisher relation, suggest a low Mass-to-Light (M/L) ratio for the stellar component in spirals. We show that a number of "bottom-light" Initial Mass Functions (IMFs) suggested independently in literature, do imply M/L ratios as low as required, at least for late type spirals (Sbc/Sc). However the typical M/L ratio, and correspondingly the zero-point of the Tully-Fisher relation, is expected to vary considerably with Hubble type. Bottom-light IMFs tend to have a metal production in excess of what is tipically estimated for spiral galaxies. Suitable tuning of the IMF slope and mass limits, post-supernova fallback of metals onto black holes or metal outflows must then be invoked, to reproduce the observed chemical properties of disc galaxies.

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