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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448207.0, MPI für Astronomie / Publikationen_mpia
The environmental dependence of the stellar-mass-size relation in STAGES galaxies
Authors:Maltby, David T.; Aragón-Salamanca, Alfonso; Gray, Meghan E.; Barden, Marco; Häußler, Boris; Wolf, Christian; Peng, Chien Y.; Jahnke, Knud; McIntosh, Daniel H.; Böhm, Asmus; Kampen, Van Eelco
Date of Publication (YYYY-MM-DD):2009-01
Title of Journal:Monthly Notices of the Royal Astronomical Soc
Journal Abbrev.:MNRAS
Review Status:not specified
Audience:Experts Only
Abstract / Description:ABSTRACT We present the stellar-mass-size relations for elliptical, lenticular and spiral galaxies in the field and cluster environments using Hubble Space Telescope/Advanced Camera for Surveys imaging and data from the Space Telescope A901/2 Galaxy Evolution Survey. We use a large sample of ~1200 field and cluster galaxies and a sub-sample of cluster core galaxies, and quantify the significance of any putative environmental dependence on the stellar-mass-size relation. For elliptical, lenticular and high-mass (logM*/Msolar > 10) spiral galaxies we find no evidence to suggest any such environmental dependence, implying that internal drivers are governing their size evolution. For intermediate-/low-mass spirals (logM*/Msolar < 10) we find evidence, significant at the 2σ level, for a possible environmental dependence on galaxy sizes: the mean effective radius for lower mass spirals is ~15-20 per cent larger in the field than in the cluster. This is due to a population of low-mass large-ae field spirals that are largely absent from the cluster environments. These large-ae field spirals contain extended stellar discs not present in their cluster counterparts. This suggests that the fragile extended stellar discs of these spiral galaxies may not survive the environmental conditions in the cluster. Our results suggest that internal physical processes are the main drivers governing the size evolution of galaxies, with the environment possibly playing a role affecting only the discs of intermediate-/low-mass spirals.
Free Keywords:galaxies: clusters: general; galaxies: elliptical and lenticular; cD; galaxies: evolution; galaxies: fundamental parameters; galaxies: spiral; 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.tmp.1878M [ID No:1]
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