On the fundamental properties of dynamically hot galaxies

A two-component isothermal equilibrium model is applied to reproduce basic structural properties of dynamically hot stellar systems immersed in their massive dark haloes. The origin of the fundamental plane relation for giant ellipticals is naturally explained as a consequence of dynamical equilibri...

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Published in:Monthly notices of the Royal Astronomical Society 1997-01, Vol.284 (2), p.327-334
Main Author: Kritsuk, Alexei G.
Format: Article
Language:English
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dark matter
galaxies: elliptical and lenticular
galaxies: formation
galaxies: fundamental parameters
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description A two-component isothermal equilibrium model is applied to reproduce basic structural properties of dynamically hot stellar systems immersed in their massive dark haloes. The origin of the fundamental plane relation for giant ellipticals is naturally explained as a consequence of dynamical equilibrium in the context of the model. The existence of two galactic families displaying different behaviour in the luminosity—surface-brightness diagram is shown to be a result of a smooth transition from dwarfs, dominated by dark matter near the centre, to giants dominated by the luminous stellar component. The comparison of empirical scaling relations with model predictions suggests that probably a unique dissipative process was operating during the violent stage of development of stellar systems in the dark haloes, and the depth of the potential well controlled the observed luminosity of the resulting galaxies. The interpretation also provides some restrictions on the properties of dark haloes implied by the fundamental scaling laws.
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subjects dark matter
galaxies: elliptical and lenticular
galaxies: formation
galaxies: fundamental parameters
title On the fundamental properties of dynamically hot galaxies
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