Fundamental plane: dark matter and dissipation contributions

Details Fundamental plane: dark matter and dissipation contributions Fundamental plane: dark matter and dissipation contributions

2010-06-09

arxiv.org/abs/1006.1820v2

Astronomy and Astrophysics Journal, v. 521, p. A58, 2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages, 5 figures, accepted for publication in Astronomy & Astrophysics. One reference is corrected in the new version

Scientific paper

10.1051/0004-6361/200913989

Stellar and galactic systems are objects in dynamical equilibrium that are composed of ordinary baryonic matter hypothetically embedded in extended dominant dark matter halos. Our aim is to investigate the scaling relations and dissipational features of these objects over a wide range of their properties, taking the dynamical influence of the dark matter component into account. We study the physical properties of these self-gravitating systems using the two-component virial theorem in conjunction with data that embrace a wide range of astrophysical systems. We find that the scaling relations defined by the properties of these objects admit a dark-to-luminous density ratio parameter as a natural requirement in this framework. We also probe dissipational effects on the fundamental surface defined by the two-component virial theorem and discuss their relations with respect to the region devoid of objects in the data distribution. Our results indicate complementary contributions of dissipation and dark matter to the orign of scaling relations in astrophysical systems.

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