Alfven wave support of a dwarf molecular cloud. I. an isothermal model.

Details Alfven wave support of a dwarf molecular cloud. I. an isothermal model. Alfven wave support of a dwarf molecular cloud. I. an isothermal model.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...326.1176m&link_type=abstract

Astronomy and Astrophysics, v.326, p.1176-1186

Astronomy and Astrophysics

Astrophysics

19

Ism: Clouds, Ism: Magnetic Fields, Ism: Structure, Mhd, Waves

Scientific paper

Dwarf (or dark) molecular clouds and molecular clumps have a lifetime which is greater than their dynamical time and must therefore be, in an average sense, in mechanical equilibrium. Equilibrium perpendicular to a global magnetic field is by magnetic forces and it is proposed that along the field the gas is supported by an Alfven wave pressure force. A self-consistent analytical model, utilising a WKB approximation, is developed for such support. It is found that Alfven waves are indeed a good candidate for this support, generating model cloud thicknesses consistent with observations. The effect of damping by the linear process of ion-neutral friction is considered. It is found that the damping of the waves is not a necessary condition for the support of the cloud although weak damping is an advantage. The possible sources of these waves are discussed.

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