Journal Article

Dwarf galaxy populations in present-day galaxy clusters – I. Abundances and red fractions

Simone M. Weinmann, Thorsten Lisker, Qi Guo, Hagen T. Meyer and Joachim Janz

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 416, issue 2, pages 1197-1214
Published in print September 2011 | ISSN: 0035-8711
Published online September 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19118.x
Dwarf galaxy populations in present-day galaxy clusters – I. Abundances and red fractions

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We compare the galaxy population in the Virgo, Fornax, Coma and Perseus cluster to a state-of-the-art semi-analytic model, focusing on the regime of dwarf galaxies with luminosities from approximately 108 to 109 L. We find that the number density profiles of dwarfs in observed clusters are reproduced reasonably well, and that the red fractions of model clusters provide a good match to Coma and Perseus. On the other hand, the red fraction among dwarf galaxies in Virgo is clearly lower than in model clusters. We argue that this is mainly caused by the treatment of environmental effects in the model. This explanation is supported by our finding that the colours of central (‘field’) dwarf galaxies are reproduced well, in contrast to previous claims. Finally, we find that the dwarf-to-giant ratio in model clusters is too high. This may indicate that the current model prescription for tidal disruption of faint galaxies is still not efficient enough.

Keywords: galaxies: abundances; galaxies: clusters: general; galaxies: dwarf; galaxies: evolution; galaxies: statistics

Journal Article.  15532 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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