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The Vc − σ0 relation of galaxies

Published online by Cambridge University Press:  01 July 2007

Stéphane Courteau
Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, Ontario, Canada email:,,
Michael McDonald
Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, Ontario, Canada email:,,
Lawrence M. Widrow
Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, Ontario, Canada email:,,
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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.

Contributed Papers
Copyright © International Astronomical Union 2008


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