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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448328.0, MPI für Astronomie / Publikationen_mpia
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
Date of Publication (YYYY-MM-DD):2009
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:MNRAS
Issue / Number:3
Start Page:1213
End Page:1228
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
Free Keywords:galaxies: clusters: general; galaxies: evolution; galaxies: fundamental parameters; galaxies: haloes; galaxies: statistics; galaxies: structure
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009MNRAS.394.1213W [ID No:1]
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