Virial theorem analysis of 3D numerical simulations of MHD self-gravitating turbulence

Details Virial theorem analysis of 3D numerical simulations of MHD self-gravitating turbulence Virial theorem analysis of 3D numerical simulations of MHD self-gravitating turbulence

2001-11-30

arxiv.org/abs/astro-ph/0111574v1

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, to appear in: ''Seeing Through the Dust: The Detection of HI and the Exploration of the ISM in Galaxies'',

Scientific paper

We discuss the virial balance of all members of a cloud ensemble in numerical simulations of self-gravitating MHD turbulence. We first discuss the choice of reference frame for evaluating the terms entering the virial theorem (VT), concluding that the balance of each cloud should be measured in its own reference frame. We then report preliminary results suggesting that a) the clouds are far from virial equilibrium, with the ``geometric'' (time derivative) terms dominating the VT. b) The surface terms in the VT are as important as the volume ones, and tend to decrease the action of the latter. c) This implies that gravitational binding should be considered including the surface terms in the overall balance.

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