The stellar Mass-to-Light ratio in disc galaxies

Details The stellar Mass-to-Light ratio in disc galaxies The stellar Mass-to-Light ratio in disc galaxies

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..220..309p&link_type=abstract

International Astronomical Union Symposium no. 220, held 21 - 25 July, 2003 in Sydney, Australia. Eds: S. D. Ryder, D. J. Pisano

Astronomy and Astrophysics

Astronomy

Scientific paper

The mass and distribution of baryons in galaxies is closely related to the inferred structure of the dark halo. A robust estimate of the baryon content requires knowledge of the typical mass-to-light (M/L) ratio of the stellar component. Various arguments favour a low M_*/L_I<1 for late-type spirals. We show that ``bottom-light'' Initial Mass Functions (IMFs) favoured by recent literature do yield so low M/L ratios, for Sbc/Sc discs. We also predict the stellar M/L ratio, and hence the zero-point of the Tully-Fisher relation, to vary significantly with Hubble disc type. Finally, we provide colour-M/L relations to derive the stellar M/L ratio from the observed photometry, for different IMFs.

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