Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233..524b&link_type=abstract
Astrophysical Journal, Part 1, vol. 233, Oct. 15, 1979, p. 524-538.
Astronomy and Astrophysics
Astrophysics
44
Astronomical Photometry, Density Wave Model, Galactic Structure, Luminous Intensity, Star Formation, Stellar Motions, Brightness, Carbon Monoxide, Interstellar Matter, Open Clusters, Shock Wave Propagation, Ubv Spectra
Scientific paper
A model for galactic orbits of molecular clouds is examined in which the clouds are assumed to be launched from a two-armed spiral shock wave and orbit in the Galaxy like ballistic particles. Tests and predictions of this model are discussed, along with the set of ballistic-particle initial orbits for a best-fitting model. It is shown that postshock initial velocities and a CO 'cutoff' age of 40 million years give the best-fitting model. The contributions of each model cloud along a galactic line of sight to the CO profile in that direction are summed, and the result is compared with the observed profile. The galactic surface brightness that would be observed in the UBV photometric system is considered by assuming that each molecular cloud becomes an open star cluster that continues in ballistic orbit around the Galaxy. The model surface brightness is compared with that observed for Sb and Sc galaxies by Schweizer (1976).
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