Cluster cannibalism and scaling relations of galactic stellar nuclei

Bekki, Kenji, Couch, Warrick J., Drinkwater, Michael J. and Shioya, Yasuhiro (2004) Cluster cannibalism and scaling relations of galactic stellar nuclei. Astrophysical Journal, 610 1: L13-L16. doi:10.1086/423130

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Author Bekki, Kenji
Couch, Warrick J.
Drinkwater, Michael J.
Shioya, Yasuhiro
Title Cluster cannibalism and scaling relations of galactic stellar nuclei
Journal name Astrophysical Journal   Check publisher's open access policy
ISSN 0004-637X
Publication date 2004
Sub-type Article (original research)
DOI 10.1086/423130
Open Access Status File (Publisher version)
Volume 610
Issue 1
Start page L13
End page L16
Total pages 4
Place of publication Philadelphia, PA, United States
Publisher Institute of Physics Publishing
Collection year 2004
Language eng
Abstract 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 ultracompact dwarf (UCD) galaxies or nuclear clusters (NCs) - form and evolve. By adopting a formation scenario in which 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 among 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.
Keyword Astronomy & Astrophysics
Galaxies : Dwarf
Galaxies : Nuclei
Galaxies : Star Clusters
Globular Clusters : General
Compact Dwarf Galaxies
Space-telescope Census
Massive Star-clusters
Spiral Galaxies
Elliptical Galaxies
Fornax Cluster
Q-Index Code C1
Institutional Status UQ

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Created: Wed, 15 Aug 2007, 04:40:01 EST