Magnetic flux loss from interstellar clouds with various grain-size distributions

Details Magnetic flux loss from interstellar clouds with various grain-size distributions Magnetic flux loss from interstellar clouds with various grain-size distributions

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...368..181n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 10, 1991, p. 181-194.

Astronomy and Astrophysics

Astrophysics

95

Charged Particles, Cosmic Dust, Grain Size, Interstellar Magnetic Fields, Interstellar Matter, Magnetic Flux, Abundance, Astronomical Models, Molecular Clouds, Particle Density (Concentration), Particle Size Distribution, Star Formation

Scientific paper

The densities of charged particles and the dissipation of magnetic fields in interstellar clouds shielded from UV radiation and having densities between 1000 and 10 to the 13th/cu cm are investigated. The effect of the electric polarization of the gains on collision with ions and electrons is taken into account, and different models for the grain size distribution are used. It is found that the metal ions are not the major constitutents among the charged particles due to their ability to recombine efficiently on grain surfaces. In a cloud where the magnetic field strength is nearly equal to the critical field with which the magnetic force balances self-gravity, the magnetic flux loss time is shorter than the free-fall time only if the density is greater than the critical density, which is given for the different models. In all cases the magnetic field is strongly coupled to the gas and the magnetic flux of the cloud cannot decrease far below the critical flux.

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