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The colours of satellite galaxies in groups and clusters.

Font, A.S. and Bower, R.G. and McCarthy, I.G. and Benson, A.J. and Frenk, C.S. and Helly, J.C. and Lacey, Cedric G. and Baugh, C.M. and Cole, Shaun (2008) 'The colours of satellite galaxies in groups and clusters.', Monthly Notices of the Royal Astronomical Society., 389 (4). pp. 1619-1629.

Abstract

Current models of galaxy formation predict satellite galaxies in groups and clusters that are redder than observed. We investigate the effect on the colours of satellite galaxies produced by the ram-pressure stripping of their hot-gaseous atmospheres as the satellites orbit within their parent halo. We incorporate a model of the stripping process based on detailed hydrodynamic simulations within the Durham semi-analytic model of galaxy formation. The simulations show that the environment in groups and clusters is less aggressive than previously assumed. The main uncertainty in the model is the treatment of gas expelled by supernovae. With reasonable assumptions for the stripping of this material, we find that satellite galaxies are able to retain a significant fraction of their hot gas for several Gyr, thereby replenishing their reservoirs of cold, star-forming gas and remaining blue for a relatively long period of time. A bimodal distribution of galaxy colours, similar to that observed in Sloan Digital Sky Survey data, is established and the colours of the satellite galaxies are in good agreement with the data. In addition, our model naturally accounts for the observed dependence of satellite colours on environment, from small groups to high-mass clusters.

Item Type:Article
Keywords:Galaxies, Clusters, Evolution, Fundamental parameter, Luminosity function, Mass.
Full text:PDF (arXiv version) - Other (409Kb)
Full text:PDF - Published Version (765Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1111/j.1365-2966.2008.13698.x
Publisher statement:This article has been published in the Monthly Notices of the Royal Astronomical Society © 2008 The Authors. Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.
Record Created:30 Nov 2012 12:35
Last Modified:01 Jul 2014 09:47

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