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The Vc − σ0 relation of galaxies

Published online by Cambridge University Press:  01 July 2007

Stéphane Courteau ,
Michael McDonald  and
Lawrence M. Widrow
Stéphane Courteau
Affiliation:
Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, Ontario, Canada email: courteau@astro.queensu.ca, mcdonald@astro.queensu.ca, widrow@astro.queensu.ca
Michael McDonald
Affiliation:
Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, Ontario, Canada email: courteau@astro.queensu.ca, mcdonald@astro.queensu.ca, widrow@astro.queensu.ca
Lawrence M. Widrow
Affiliation:
Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, Ontario, Canada email: courteau@astro.queensu.ca, mcdonald@astro.queensu.ca, widrow@astro.queensu.ca
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Abstract

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Courteau et al. (2007a) reported on the dependence of the ratio of a galaxy's maximum circular velocity, Vc, to its central velocity dispersion, σ0, on morphology, or equivalently total light concentration. This Vc − σ0–concentration relation, which involves details about the local and global galaxy physics, poses a fundamental challenge for galaxy structure models. Furthermore, not only must these models reproduce the Vc − σ0 relation and its various dependences, they must simultaneously match other fundamental scaling relations such as the velocity-size-luminosity and color-luminosity relations. We focus here on the interpretation of parameters that enter the Vc − σ0 relation to enable proper data-model comparisons and follow-up studies by galaxy modelers and observers.

Keywords

galaxies: fundamental parametersgalaxies: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 227 - 230
Copyright
Copyright © International Astronomical Union 2008

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