Astronomy and Astrophysics – Astrophysics
Scientific paper
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.
Kwan John
Valdes Francisco
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