
%0 Journal Article
%A Portinari, L. 
%A Sommer-Larsen, J. 
%A Tantalo, R. 
%T Mass to Light Ratio, Initial Mass Function, and Chemical Evolution in&#160;Disk&#160;Galaxies
%J Publications of the Astronomical Society of Australia
%D 2004/06/11
%V 21
%N 2
%P 144-147
%K galaxies: spiral &#8212; galaxies: evolution &#8212; stars: initial mass function
%R https://doi.org/10.1071/AS04019
%U https://www.publish.csiro.au/paper/AS04019 
%X Cosmological simulations of disk galaxy formation, when compared to the observed Tully&#8211;Fisher relation, suggest a low mass to light (M/L) ratio for the stellar component in spirals. We show that a number of &#39;bottom-light&#39; initial mass functions (IMFs) suggested independently in the literature, do imply M/L ratios as low as required, at least for late type spirals (Sbc&#8211;Sc). However the typical M/L ratio, and correspondingly the zero point of the Tully&#8211;Fisher relation, is expected to vary considerably with Hubble type.Bottom-light IMFs tend to have a metal production in excess of what is typically 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 disk galaxies. 
