Magnetised molecular cloud edges

Details Magnetised molecular cloud edges Magnetised molecular cloud edges

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...224..191v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 224, no. 1-2, Oct. 1989, p. 191-198.

Astronomy and Astrophysics

Astrophysics

7

Astronomical Spectroscopy, Magnetic Fields, Molecular Clouds, Shock Waves, Stellar Envelopes, Carbon, Carbon Monoxide, Dynamic Characteristics, Recombination Reactions, Sulfur

Scientific paper

Magnetic and dynamical properties of molecular cloud edges are computed in the framework of a model, using existing observations of several C II layers and S II layers near H II regions. Results obtained by comparing the observed carbon recombination lines in cloud edges with carbon monoxide lines in cloud envelopes indicate a typical penetration speed of 0.8 km/s, sound speed of 0.6 km/s in C II layers (0.2 km/s elsewhere), Alfven speed of 0.8 km/s, and ambipolar diffusion speed of 2 mm/s. The typical magnetic field intensity derived is 90 microgauss, for a compression factor between 2 and 10 and a layer density of 60,000/cu cm. Similar results are obtained from the observed sulfur recombination line-emitting layers inside molecular cloud edges.

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