Other
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243..103u&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 243, March 1, 1990, p. 103-113.
Other
105
Interstellar Matter, Magnetic Flux, Molecular Clouds, Star Formation, Abundance, Charged Particles, Interstellar Magnetic Fields, Recombination Reactions
Scientific paper
The densities of various charged particles in the ionization-recombination equilibrium is studied with a simplified reaction scheme and revised reaction rate coefficients. In particular, the dissociative recombination rate of H3(+) with an electron is decreased by a factor of 100 from the previously used rate. The general formula for describing the dissipation of magnetic fields is used to study the time-scale of magnetic flux loss from cloud cores with hydrogen number density, n(H), between 1,000 and 10 to the 13th/cu cm. It is found that reactions with CO, O2, and O transform H3(+) into other molecular ions. At n(H) below 10 to the 11th/cu cm, the magnetic flux loss time in the core of an oblate cloud is found to be considerably greater than the freefall time when the cloud has the critical magnetic field.
Nakano Takenori
Umebayashi Toyoharu
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