Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...311l..41w&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 311, Dec. 15, 1986, p. L41-L45.
Astronomy and Astrophysics
Astrophysics
50
Astronomical Models, Disk Galaxies, Molecular Clouds, Molecular Gases, Spectral Energy Distribution, Carbon Monoxide, Galactic Evolution, Galactic Structure, Gas Density, Gas Dynamics, Gravitational Fields
Scientific paper
An explanation for the observed difference in radial profiles of the atomic and molecular gas components of disk galaxies is proposed which involves GMC formation in local gravitational potential perturbations such as spiral arms. It is assumed that GMC form through binary cloud-cloud collisions within the potential of spiral density perturbations, with progenitors whose radial profile is that of the atomic gas, the rate of collisions being determined by how often a spiral arms is encountered. This model provides a good fit to the overall shape of the molecular gas distribution for disk galaxies where there is believed to be an underlying stationary density wave, with corotation resonance in the outer regions of the disk, as well as for those disk galaxies where the spiral arms are more probably transient.
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