Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...367..149m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 367, Jan. 20, 1991, p. 149-154.
Astronomy and Astrophysics
Astrophysics
5
Globular Clusters, Interstellar Matter, Milky Way Galaxy, Star Formation, Thermal Instability, Dwarf Galaxies, Perturbation Theory, Time Dependence
Scientific paper
In this paper a scenario is proposed to explain the lack of young globular clusters in the Galaxy. It is argued that the formation of the Galactic disk would induce tidal compressions on protoglobular clouds during passage through the Galactic disk. Such a compression would trigger the onset of thermal instability in typical protoglobular cluster clouds, leading to rapid cooling and contraction and subsequent star formation. The clouds are thus unlikely to survive several passages through the Galactic disk following its formation. Instabilities preferentially occur in clouds with relatively high metallicity and with orbits lying more nearly in the plane of the Galaxy, possibly leading to the formation of a population of clusters with small orbital inclination, similar to the population of disk clusters observed in the Galaxy.
Lin Douglas N. C.
Murray Stephen D.
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