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The stellar Mass–to–Light ratio in disc galaxies

Published online by Cambridge University Press:  26 May 2016

L. Portinari ,
J. Sommer–Larsen  and
R. Tantalo
L. Portinari
Affiliation:
Theoretical Astrophysics Center Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark
J. Sommer–Larsen
Affiliation:
Theoretical Astrophysics Center Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark
R. Tantalo
Affiliation:
Dipartimento di Astronomia, Università di Padova Vicolo dell'Osservatorio 2, I-35122 Padova (PD), Italy

Abstract

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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*/LI < 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.

Type
Part 9: Disks
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 309 - 310
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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