The Two-Component Virial Theorem and the Physical Properties of Stellar Systems

Details The Two-Component Virial Theorem and the Physical Properties of Stellar Systems The Two-Component Virial Theorem and the Physical Properties of Stellar Systems

1999-10-29

arxiv.org/abs/astro-ph/9910541v2

ApJ 528, L5 (2000)

Astronomy and Astrophysics

Astrophysics

13 pages, 2 figures, LaTeX, corrected few typos. This version matches the published version

Scientific paper

10.1086/312415

Motivated by present indirect evidences that galaxies are surrounded by dark matter halos, we investigate whether their physical properties can be described by a formulation of the virial theorem which explicitly takes into account the gravitational potential term representing the interaction of the dark halo with the barionic or luminous component. Our analysis shows that the application of such a ``two-component virial theorem'' not only accounts for the scaling relations displayed, in particular, by elliptical galaxies, but also for the observed properties of all virialized stellar systems, ranging from globular clusters to galaxy clusters.

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