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The counterparts of Local Group dwarf spheroidals in nearby clusters

Published online by Cambridge University Press:  08 November 2005

Michael Hilker ,
Steffen Mieske  and
L. Infante
Michael Hilker
Affiliation:
Sternwarte der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany email: [email protected], [email protected]
Steffen Mieske
Affiliation:
Sternwarte der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany email: [email protected], [email protected]
L. Infante
Affiliation:
Departamento de Astronomía y Astrofísica, P. Universidad Católica, Casilla 104, Santiago 22, Chile email: [email protected]
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Abstract

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In this contribution, we report on the discovery of dwarf spheroidals (dSphs) in the core of the Fornax cluster. Their photometric properties – like magnitude, colour, surface brightness – are very similar to those of Local Group dSphs. However, at a given total magnitude, dSphs in Fornax seem to be more extended than their Local Group counterparts. The membership of several dwarf galaxy candidates in Fornax has been confirmed by surface brightness fluctuation measurements on deep wide-field images taken with the Magellan telescope. The analysis of these images also confirms the flat faint end slope of the luminosity function for dSphs in Fornax which contradicts the expected large number of small dark matter halos connected to dwarf galaxies in $\Lambda$CDM theory. Dwarf spheroidals have also been detected in the Hydra I and Centaurus cluster. A preliminary analysis of their photometric properties shows that they obey similar scaling relations as their counterparts in Fornax and the Local Group.

Keywords

Galaxies: clusters: individual (Fornax, Hydra I Centaurus)galaxies: dwarffundamental parametersluminosity functionphotometry
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C198: Near-Field Cosmology with Dwarf Elliptical Galaxies , March 2005 , pp. 290 - 294
Copyright
© 2005 International Astronomical Union