Young globular clusters and dwarf spheroidals

被引:36
作者
van den Bergh, S [1 ]
机构
[1] Natl Res Council Canada, Herzberg Inst Astrophys, Dominion Astrophys Observ, Victoria, BC V8X 4M6, Canada
关键词
galaxies : dwarf; globular clusters : general;
D O I
10.1086/308413
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Most of the globular clusters in the main body of the Galactic halo were formed almost simultaneously. However, globular cluster formation in dwarf spheroidal galaxies appears to have extended over a significant fraction of a Hubble time. This suggests that the factors which suppressed late-time formation of globulars in the main body of the Galactic halo were not operative in dwarf spheroidal galaxies. Possibly the presence of significant numbers of "young" globulars at R-GC > 15 kps can be accounted for by the assumption that many of these objects were formed in Sagittarius-like (but not Fornax-like) dwarf spheroidal galaxies, that were subsequently destroyed by Galactic tidal forces. It would be of interest to search for low-luminosity remnants of parental dwarf spheroidals around the "young" globulars Eridanus, Palomar 1, 3, and 14. Furthermore, multicolor photometry could be used to search for the remnants of the superassociations, within which outer halo globular clusters originally formed. Such envelopes are expected to have been tidally stripped from globulars in the inner halo.
引用
收藏
页码:777 / 782
页数:6
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