The spatial and mass distributions of molecular clouds and spiral structure

Details The spatial and mass distributions of molecular clouds and spiral structure The spatial and mass distributions of molecular clouds and spiral structure

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315...92k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 1, 1987, p. 92-103.

Astronomy and Astrophysics

Astrophysics

52

Galactic Structure, Mass Distribution, Milky Way Galaxy, Molecular Clouds, Spatial Distribution, Collisions, Density Wave Model, Gravitational Effects, Interstellar Matter

Scientific paper

The authors model the growth of molecular clouds resulting from cloud-cloud collisions and coalescence in the Galactic ring between 4 and 8 kpc, taking into account the presence of a spiral potential and the mutual cloud-cloud gravitational attraction. The mean lifetime of molecular clouds is determined to be ≡2×108yr. The clouds are present in both spiral arm and interarm regions, but a spiral pattern in their spatial distribution is clearly discernible, with the more massive clouds showing a stronger correlation with the spiral arms. As viewed from within the Galactic disk, however, it is very difficult to ascertain that the molecular cloud distribution in longitude-velocity space has a spiral pattern.

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