Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....75...54b&link_type=abstract
Astronomy and Astrophysics, vol. 75, no. 1-2, May 1979, p. 54-60.
Astronomy and Astrophysics
Astrophysics
11
Interstellar Magnetic Fields, Interstellar Matter, Milky Way Galaxy, Molecular Gases, Coupling, Dense Plasmas, Dynamic Models, Gas Ionization, Magnetic Field Configurations, Magnetic Flux, Stellar Gravitation, Zeeman Effect
Scientific paper
Observations suggest that molecular interstellar material generally contains a normal amount of magnetic flux whereas the material that forms stars does not. It appears that a field-removal process is essential to star formation. Ambipolar diffusion is not rapid even at low fractional ionizations and the considerable enhancement of magnetic field gradients occurring through magnetic domain formation seems essential to create the field-free material. The two-component molecular medium created by field removal reconciles the low rate of star formation with the large fraction of interstellar material in molecular form because only that fraction of the medium in the low-field, high-density component can be converted to stars in a free fall time.
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