Spiral gravitational potentials and the mass growth of molecular clouds

Details Spiral gravitational potentials and the mass growth of molecular clouds Spiral gravitational potentials and the mass growth of molecular clouds

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271..604k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 271, Aug. 15, 1983, p. 604-610.

Astronomy and Astrophysics

Astrophysics

60

Galactic Structure, Gravitational Fields, Mass Distribution, Molecular Clouds, Spiral Galaxies, Astronomical Models, Interstellar Matter

Scientific paper

Via numerical simulation, the growth of molecular clouds resulting from cloud-cloud collisions is followed. Coalescence takes place as the clouds encounter a spiral gravitational potential. It is found that the rate of growth of massive clouds near the potential minimum is enhanced, by a factor of about 3-6, above that obtained in the absence of a spiral perturbation. If giant clouds have a short time span compared with the period between successive encounters of the spiral potentials, they will occur predominantly near the potential minimum. The mean lifetime of molecular clouds as a whole, however, is longer than 10 to the 8th years.

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