Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 440, Issue 2, Pages 1690-1711Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu325
Keywords
galaxies: clusters: individual: Abell 1656; galaxies: elliptical and lenticular; cD; galaxies: evolution; galaxies: formation; galaxies: structure
Categories
Funding
- STFC [ST/I505656/1, ST/I001573/1]
- NSERC (Canada)
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy Office of Science
- University of Arizona
- Brazilian Participation Group
- Brookhaven National Laboratory
- Carnegie Mellon University
- University of Florida
- French Participation Group
- German Participation Group
- Harvard University
- Instituto de Astrofisica de Canarias
- Michigan State/Notre Dame/JINA Participation Group
- Johns Hopkins University
- Lawrence Berkeley National Laboratory
- Max Planck Institute for Astrophysics
- Max Planck Institute for Extraterrestrial Physics
- New Mexico State University
- New York University
- Ohio State University
- Pennsylvania State University
- University of Portsmouth
- Princeton University
- Spanish Participation Group
- University of Tokyo
- University of Utah
- Vanderbilt University
- University of Virginia
- University of Washington
- Yale University
- STFC [ST/L005042/1, ST/L00075X/1, ST/I505656/1, ST/I001573/1, ST/J004650/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/I001573/1, ST/I505656/1, ST/J004650/1, ST/L00075X/1, ST/L005042/1] Funding Source: researchfish
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We explore the internal structure of red-sequence galaxies in the Coma cluster across a wide range of luminosities (-17 > M-g > -22) and cluster-centric radii (0 < r(cluster) < 1.3 r(200)). We present the 2D bulge-disc decomposition of galaxies in deep Canada-France-Hawaii Telescope u, g, i imaging using galfit. Rigorous filtering is applied to identify an analysis sample of 200 galaxies which are well described by an 'archetypal' S0 structure (central bulge + outer disc). We consider internal bulge and/or disc colour gradients by allowing component sizes to vary between bands. Gradients are required for 30 per cent of analysis sample galaxies. Bulge half-light radii are found to be uncorrelated with galaxy luminosity (R-e similar to 1 kpc, n similar to 2) for all but the brightest galaxies (M-g < -20.5). The S0 discs are brighter (at fixed size, or smaller at fixed luminosity) than those of star-forming spirals. A similar colour-magnitude relation is found for both bulges and discs. The global red sequence for S0s in Coma hence results from a combination of both component trends. We measure an average bulge - disc colour difference of 0.09 +/- 0.01 mag in g - i, and 0.16 +/- 0.01 mag in u - g. Using simple stellar population models, bulges are either similar to 2-3 times older, or similar to 2 times more metal rich than discs. The trend towards bluer global S0 colours observed further from Coma's core is driven by a significant correlation in disc colour with cluster-centric radius. An equivalent trend is detected in bulge colours at a marginal significance level. Our results therefore favour environment-mediated mechanisms of disc fading as the dominant factor in S0 formation.
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