Magnetohydrodynamic shock waves in molecular clouds

Details Magnetohydrodynamic shock waves in molecular clouds Magnetohydrodynamic shock waves in molecular clouds

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..485d&link_type=abstract

Astrophysical Journal, Part 1, vol. 264, Jan. 15, 1983, p. 485-507.

Astronomy and Astrophysics

Astrophysics

621

Interstellar Gas, Magnetohydrodynamic Waves, Molecular Clouds, Shock Waves, Hydrogen, Infrared Spectra, Interstellar Magnetic Fields, Molecular Excitation, Molecular Interactions, Momentum Transfer, Plane Waves, Wave Propagation

Scientific paper

Calculations for the structure of shock waves in molecular clouds are presented which include the effects of ion-neutral streaming driven by the magnetic field. Results show that shock waves in molecular clouds will usually be C-type shock waves, mediated entirely by the dissipation accompanying ion-neutral streaming, and in which all of the hydrodynamic variables are continuous. The magnetohydrodynamic shock waves propagating at speeds in the range of 5-50 km/s in molecular clouds with preshock densities n(H) = 100, 10000, and 1000000/cu cm are studied in detail. The effects of chemical changes in the composition of oxygen-bearing molecules are determined, and the contributions to the cooling of the shocked gas by emission from H2, CO, OH, and H2O are evaluated. The intensities of the rotation-vibration lines of H2 and of the fine-structure lines of O I and C I are predicted. It is shown that magnetic fields may lead to a substantial increae in the limiting shock velocity above which dissociation of H2 takes place, such that for a cloud of intensity n(H) = 1000000/cu cm, the limiting shock speed is approximately 45 km/s.

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