On the virial theorem for turbulent molecular clouds

Details On the virial theorem for turbulent molecular clouds On the virial theorem for turbulent molecular clouds

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399..551m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 2, p. 551-562.

Statistics

Computation

67

Interstellar Matter, Magnetohydrodynamic Turbulence, Molecular Clouds, Virial Theorem, Computational Astrophysics, Interstellar Magnetic Fields

Scientific paper

An Eulerian, rather than Lagrangian, form of the virial theorem is derived for a turbulent, magnetized cloud embedded in a steady, turbulent, low-density intercloud medium. The role of turbulent pressure in cloud confinement is clarified, and it is shown that, in the absence of a magnetic field, a cloud can be at a somewhat lower pressure than the intercloud medium. Simple forms for the magnetic term in the virial equation are obtained. Radiation pressure is considered; its effects are relatively small under average conditions in the interstellar medium. Under typical conditions, external pressure and magnetic fields are shown to have a relatively small effect on virial estimates of the mass of self-gravitating clouds.

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