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Low Luminosity Galaxies

Published online by Cambridge University Press:  05 March 2013

J. I. Davies ,
S. Sabatini  and
S. Roberts
J. I. Davies*
Affiliation:
School of Physics Astronomy, Cardiff University, Cardiff CF24 3YB, UK
S. Sabatini
Affiliation:
School of Physics Astronomy, Cardiff University, Cardiff CF24 3YB, UK
S. Roberts
Affiliation:
School of Physics Astronomy, Cardiff University, Cardiff CF24 3YB, UK
*
BCorresponding author. Email: jonathan.davies@astro.cf.ac.uk
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Abstract

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Low luminosity (dwarf) galaxies play a crucial role in our current theories of galaxy and large scale structure formation. In the hierarchical picture they are the building blocks from which other structures form. These theories in their basic form overpredict the numbers of small dark matter halos (dwarf galaxies?) unless some form of star formation supression is invoked. In this paper we describe observations of dwarf galaxies in a range of different environments. We find that there are far too few dwarf galaxies in low density environments to be compatible with the theories. These observations are not consistent with an environment-independent mechanism suppressing dwarf galaxy formation. It is also not clear how these mechanisms can supress star formation if dwarf galaxies have large mass-to-light ratios (≈100). Either the whole idea of hierarchical galaxy formation has to be rejected or other environmentally dependent physical processes have to be invoked. We suggest that small, gas-rich dI galaxies have their evolution rapidly advanced as they move into the dense cluster environment.

Keywords

galaxies: dwarfgalaxies: clusters: Virgo clustergalaxies: clusters: Ursa Major clustersurveys
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 21 , Special Issue 4: Structure and Dynamics in the Local Universe , 2004 , pp. 360 - 365
Copyright
Copyright © Astronomical Society of Australia 2004

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