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Title:
Tracking down a critical halo mass for killing galaxies through the growth of the red sequence
Authors:
Gilbank, David G.; Balogh, Michael L.
Affiliation:
AA(Astrophysics and Gravitation Group, Department of Physics & Astronomy, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1; ), AB(Astrophysics and Gravitation Group, Department of Physics & Astronomy, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1; )
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 385, Issue 1, pp. L116-L119. (MNRAS Homepage)
Publication Date:
03/2008
Origin:
MNRAS
MNRAS Keywords:
galaxies: clusters: general, galaxies: evolution, galaxies: general
DOI:
10.1111/j.1745-3933.2008.00445.x
Bibliographic Code:
2008MNRAS.385L.116G

Abstract

Red-sequence galaxies record the history of terminated star formation in the Universe and can thus provide important clues to the mechanisms responsible for this termination. We construct composite samples of published cluster and field galaxy photometry in order to study the build-up of galaxies on the red sequence, as parametrized by the dwarf-to-giant ratio (DGR). We find that the DGR in clusters is higher than that of the field at all redshifts, implying that the faint end of the red sequence was established first in clusters. We find that the DGR evolves with redshift for both samples, consistent with the `down-sizing' picture of star formation. We examine the predictions of semi-analytic models for the DGR and find that neither the magnitude of its environmental dependence nor its evolution is correctly predicted in the models. Red-sequence DGRs are consistently too high in the models, the most likely explanation being that the strangulation mechanism used to remove hot gas from satellite galaxies is too efficient. Finally, we present a simple toy model including a threshold mass, below which galaxies are not strangled, and show that this can predict the observed evolution of the field DGR.
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