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Empirical Scaling Relations

Published online by Cambridge University Press:  21 October 2010

Tommaso Treu
Tommaso Treu*
Affiliation:
Department of Physics, University of California, Santa Barbara, CA 93106-9530, USA email: tt@physics.ucsb.edu
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Abstract

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Early-type galaxies do not come in any shape, form, and color. Many of their observable properties obey tight correlations, also known as empirical scaling relations. The correlations are non-trivial, in the sense that they cannot be explained by simple physical or dimensional arguments. A subset of the empirical scaling relations connects baryonic observables with quantities that depend on the total gravitational potential of the galaxies, and thus on their dark matter content. These correlations are a fundamental testbed for our understanding of the formation and evolution of early-type galaxies, and, more in general, of the physical processes that determine the interplay between baryons and dark matter at galactic scales.

Keywords

Galaxies: elliptical and lenticularcD - Galaxies: formation - Galaxies: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Highlights H15: Highlights of Astronomy , November 2009 , pp. 80
Copyright
Copyright © International Astronomical Union 2010

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