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Title:
Environmental effects on satellite galaxies: the link between concentration, size and colour profile
Authors:
Weinmann, Simone M.; Kauffmann, Guinevere; van den Bosch, Frank C.; Pasquali, Anna; McIntosh, Daniel H.; Mo, Houjun; Yang, Xiaohu; Guo, Yicheng
Affiliation:
AA(Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str.1, Postfach 1317, 85741 Garching bei München, Germany), AB(Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str.1, Postfach 1317, 85741 Garching bei München, Germany), AC(Max-Planck-Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany), AD(Max-Planck-Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany), AE(Department of Astronomy, University of Massachusetts, Amherst, MA 01003-9305, USA; Department of Physics, 5110 Rockhill Road, University of Missouri - Kansas City, Kansas City, MO 64110, USA), AF(Department of Astronomy, University of Massachusetts, Amherst, MA 01003-9305, USA), AG(Shanghai Astronomical Observatory, the Partner Group of MPA, Nandan Road 80, Shanghai 200030, China), AH(Department of Astronomy, University of Massachusetts, Amherst, MA 01003-9305, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 394, Issue 3, pp. 1213-1228. (MNRAS Homepage)
Publication Date:
04/2009
Origin:
MNRAS
Astronomy Keywords:
galaxies: clusters: general , galaxies: evolution , galaxies: fundamental parameters , galaxies: haloes , galaxies: statistics , galaxies: structure
DOI:
10.1111/j.1365-2966.2009.14412.x
Bibliographic Code:
2009MNRAS.394.1213W

Abstract

Using the Sloan Digital Sky Survey Data Release 4 group catalogue of Yang et al., we investigate sizes, concentrations, colour gradients and surface brightness profiles of central and satellite galaxies. We compare central and satellite galaxies at fixed stellar mass, in order to disentangle environmental from stellar mass dependencies. Early- and late-type galaxies are defined according to concentration. We find that at fixed stellar mass, late-type satellite galaxies have smaller radii and larger concentrations than late-type central galaxies. No such differences are found for early-type galaxies. We have also constructed surface brightness and colour profiles for the central and satellite galaxies in our sample. We find that late-type satellite galaxies have a lower surface brightness and redder colours than late-type central galaxies. We show that all observed differences between satellite and central galaxies can be explained by a simple fading model, in which the star formation in the disc decreases over time-scales of 2-3Gyr after a galaxy becomes a satellite. Processes that induce strong morphological changes (e.g. harassment) and processes that strip the galaxy of its entire interstellar medium need not to be invoked in order to explain the environmental dependencies we find.
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