Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-20
Astrophys.J. 610 (2004) L13-L16
Astronomy and Astrophysics
Astrophysics
13 pages 4 figures (f1.copy.jp,f2.copy.jp for high-res figures), ApJL in press
Scientific paper
10.1086/423130
Recently, very massive compact stellar systems have been discovered in the intracluster regions of galaxy clusters and in the nuclear regions of late-type disk galaxies. It is unclear how these compact stellar systems -- known as ``ultra-compact dwarf'' (UCD) galaxies or ``nuclear clusters'' (NCs) -- form and evolve. By adopting a formation scenario where these stellar systems are the product of multiple merging of star clusters in the central regions of galaxies, we investigate, numerically, their physical properties. We find that physical correlations between velocity dispersion, luminosity, effective radius, and average surface brightness in the stellar merger remnants are quite different from those observed in globular clusters. We also find that the remnants have triaxial shapes with or without figure rotation, and these shapes and their kinematics depend strongly on the initial number and distribution of the progenitor clusters. These specific predictions can be compared with the corresponding results of ongoing and future observations of UCDs and NCs, thereby providing a better understanding of the origin of these enigmatic objects.
Bekki Kenji
Couch Warrick J.
Drinkwater Michael. J.
Shioya Yasuhiro
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