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Title:
Evolution in the discs and bulges of group galaxies since z = 0.4
Authors:
McGee, Sean L.; Balogh, Michael L.; Henderson, Robert D. E.; Wilman, David J.; Bower, Richard G.; Mulchaey, John S.; Oemler, Augustus, Jr.
Affiliation:
AA(Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada), AB(Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada), AC(Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada), AD(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, Germany), AE(Department of Physics, University of Durham, Durham DH1 3LE), AF(Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA), AG(Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 387, Issue 4, pp. 1605-1621. (MNRAS Homepage)
Publication Date:
07/2008
Origin:
MNRAS
MNRAS Keywords:
galaxies: evolution , galaxies: formation , galaxies: structure
DOI:
10.1111/j.1365-2966.2008.13340.x
Bibliographic Code:
2008MNRAS.387.1605M

Abstract

We present quantitative morphology measurements of a sample of optically selected group galaxies at 0.3 < z < 0.55 using the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) and the GIM2D surface brightness fitting software package. The group sample is derived from the Canadian Network for Observational Cosmology Field Galaxy Redshift Survey (CNOC2) and follow-up Magellan spectroscopy. We compare these measurements to a similarly selected group sample from the Millennium Galaxy Catalogue (MGC) at 0.05 < z < 0.12. We find that, at both epochs, the group and field fractional bulge luminosity (B/T) distributions differ significantly, with the dominant difference being a deficit of disc-dominated (B/T < 0.2) galaxies in the group samples. At fixed luminosity, z = 0.4 groups have ~5.5 +/- 2 per cent fewer disc-dominated galaxies than the field, while by z = 0.1 this difference has increased to ~19 +/- 6 per cent. Despite the morphological evolution we see no evidence that the group environment is actively perturbing or otherwise affecting the entire existing disc population. At both redshifts, the discs of group galaxies have similar scaling relations and show similar median asymmetries as the discs of field galaxies. We do find evidence that the fraction of highly asymmetric, bulge-dominated galaxies is 6 +/- 3 per cent higher in groups than in the field, suggesting there may be enhanced merging in group environments. We replicate our group samples at z = 0.4 and 0 using the semi-analytic galaxy catalogues of Bower et al. This model accurately reproduces the B/T distributions of the group and field at z = 0.1. However, the model does not reproduce our finding that the deficit of discs in groups has increased significantly since z = 0.4.
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