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Substructure in dwarf spheroidals – a star cluster connection?

Published online by Cambridge University Press:  08 November 2005

Mark I. Wilkinson ,
Jan T. Kleyna ,
N. Wyn Evans ,
Gerry F. Gilmore ,
Eva K. Grebel ,
Andreas Koch ,
Justin Read  and
Roland Young
Mark I. Wilkinson
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK email: [email protected]
Jan T. Kleyna
Affiliation:
Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, Hawaii 96822-1897, USA
N. Wyn Evans
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK email: [email protected]
Gerry F. Gilmore
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK email: [email protected]
Eva K. Grebel
Affiliation:
Astronomisches Institut, Universität Basel, Venusstrasse 7, CH 4102 Binningen, Switzerland
Andreas Koch
Affiliation:
Astronomisches Institut, Universität Basel, Venusstrasse 7, CH 4102 Binningen, Switzerland
Justin Read
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK email: [email protected]
Roland Young
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK email: [email protected]
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Abstract

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The observational evidence for kinematic substructure in Local Group dSphs is reviewed. The properties of these substructures are consistent with their being disrupted star clusters. The persistence of cold substructure argues strongly against the presence of dark matter cusps in the haloes of dSphs. A formation scenario for dSphs is described involving the merger of star clusters in the potential well of a low-mass dark matter halo.

Keywords

stars: kinematicsgalaxies: dwarfgalaxies: formationgalaxies: halosgalaxies: kinematics and dynamicsLocal Groupgalaxies: star clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C198: Near-Field Cosmology with Dwarf Elliptical Galaxies , March 2005 , pp. 240 - 243
Copyright
© 2005 International Astronomical Union