Statistics – Computation
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.144..587a&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 144, no. 1-2, May 1988, p. 587-614.
Statistics
Computation
Gravitational Collapse, Interstellar Gas, Interstellar Magnetic Fields, Magnetic Clouds, Molecular Clouds, Computational Astrophysics, Statistical Distributions
Scientific paper
The role of the magnetic field in the confinement or compression of interstellar gas clouds is reconsidered. The virial theorem for an isolated magnetized cloud in the presence of distant magnetic sources is reformulated in terms of moments of the internal and external currents, and an equilibrium condition is derived. This condition is applied to the interaction between isolated clouds for the simple- and artificial-case in which the field of each cloud is a dipole. With the simplest of statistical assumptions, the probability of any given cloud being compressed is calculated as about 10 percent, the magnetic field acting as a medium which transmits the kinetic pressure between clouds. Even when compression occurs the magnetic pressure 1/2 B-squared may decrease on leaving the cloud surface.
Azar Michel
Thompson William B.
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