Release 11.12 ("Hergest Ridge")


Gclusters :: Bibliographic item "gc445"

Article ID: gc445
Authorvan den Bergh, Sidney
TitleThe proto-galaxy, globular clusters, and quasars
JournalAstrophysical Journal, Part 1, vol. 411, no. 1, p. 178-187
Year of publication1993 (on gclusters from 2014-02-11 11:33:44 )
AbstractMetallicities and horizontal-branch population gradients are used to distinguish between two populations of Galactic halo globular clusters. The beta population of clusters appears to be almost coeval and occurs mainly at R less than R(solar). Clusters of the beta population were probably formed during a rapid Eggen, Lynden-Bell, and Sandage-type collapse of the inner proto-Galaxy. Clusters of the alpha population all occur at R greater than 8 kpc. Many of these objects are found to lie on plunging retrograde orbits. This suggests that clusters of the alpha population formed during an extended Searle-Zinn-type merger and collapse phase...
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