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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 

References

Bell, E.F. & de Jong, R.S., 2001, ApJ, 550, 212.CrossRefGoogle Scholar
Chabrier, G., 2001, ApJ, 554, 1274.CrossRefGoogle Scholar
Chabrier, G., 2002, ApJ, 567, 304.CrossRefGoogle Scholar
Kannappan, S.J., Fabricant, D.G. & Franx, M., 2002, AJ, 123, 2358.CrossRefGoogle Scholar
Kennicutt, R.C., Tamblyn, P. & Congdon, C.W., 1994, ApJ, 435, 22.CrossRefGoogle Scholar
Kroupa, P., 1998, in ASP Conf. Ser. Vol. 134, p. 483.Google Scholar
Larson, R.B., 1998, MNRAS, 301, 569.CrossRefGoogle Scholar
Portinari, L., Sommer–Larsen, J. & Tantalo, R., 2003, MNRAS, in press (astro-ph/0303190) (PST).Google Scholar
Salpeter, E.E., 1955, ApJ, 121, 161.CrossRefGoogle Scholar
Sommer–Larsen, J., Götz, M. & Portinari, L., 2003, ApJ, 596, 47.CrossRefGoogle Scholar