Energy Budget and the Virial Theorem in Interstellar Clouds
arXiv:astro-ph/9701049
Abstract
The Virial Thoerem is a mathematical expression obtained from the equation of motion for a fluid, which describes the energy budget of particular regions within the flow. This course reviews the basic theory leading to the Virial Theorem, discusses its applicability and limitations, and then summarizes observational results concerning the physical and statistical properties of interstellar clouds which are normally understood in terms of the Virial Theorem, in particular the so-called ``Larson's Relations''. In all cases, the standard notions as well as relevant counterpoint are presented. In particular, the difficulties arising when the medium is fully turbulent are discussed.
arXiv comment18 pages, 1 Latex file, 3 Postscript figures, 2 style files. To appear in ``Millimetric and Sub-Millimetric Astronomy. INAOE 1996 Summer School''
References in corpus (6)
- A Turbulent Model for the Interstellar Medium. II. Magnetic Fields and Rotation
- Supersonic Turbulence and the Fragmentation of a Cold Medium
- A Search for Larson-Type Relations in Numerical Simulations of the ISM. Evidence for Non-Constant Column Densities
- Can Nonlinear Hydromagnetic Waves Support a Self-Gravitating Cloud?
- Influence of Cooling-Induced Compressibility on the Structure of Turbulent Flows and Gravitational Collapse
- On Scaling Laws and Alfvenic Magnetic Fluctuations in Molecular Clouds