Galaxy and mass assembly: resolving the role of environment in galaxy evolution

S. Brough*, S. Croom, R. Sharp, A. M. Hopkins, E. N. Taylor, I. K. Baldry, M. L P Gunawardhana, J. Liske, P. Norberg, A. S G Robotham, A. E. Bauer, J. Bland-Hawthorn, M. Colless, C. Foster, L. S. Kelvin, M. A. Lara-Lopez, A. R. López-Sánchez, J. Loveday, M. Owers, K. A. PimbbletM. Prescott

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)

Abstract

We present observations of 18 galaxies from the Galaxy And Mass Assembly (GAMA) survey made with the SPIRAL optical integral field unit (IFU) on the Anglo-Australian Telescope. The galaxies are selected to have a narrow range in stellar mass (6 × 109 < M* < 2 × 1010M⊙) in order to focus on the effects of environment. Local galaxy environments are measured quantitatively using fifth nearest neighbour surface densities. We find that the total star formation rates (SFR) measured from the IFU data are consistent with total SFRs measured from aperture correcting either GAMA or Sloan Digital Sky Survey single-fibre observations. The mean differences are SFRGAMA/SFRIFU = 1.26 ± 0.23, s = 0.90 and for the Sloan Digital Sky Survey we similarly find SFRBrinchmann/SFRIFU = 1.34 ± 0.17, σ= 0.67. Examining the relationships with environment, we find that off-centre and clumpy Ha emission is not significantly dependent on environment, being present in 2/7 (2920 -11 per cent) galaxies in high-density environments (>0.77 Mpc-2), and 5/11 (45+15-13 per cent) galaxies in low-density environments (<0.77 Mpc-2). We find a weak but not significant relationship of the total SFRs of star-forming galaxies with environment. Due to the size of our sample and the scatter observed we do not draw a definitive conclusion about a possible SFR dependence on environment. Examining the spatial distribution of the Ha emission, we find no evidence for a change in shape or amplitude of the radial profile of star-forming galaxies with environment. If these observations are borne out in larger samples, this would infer that any environment-driven star formation suppression must either act very rapidly (the 'infall-and-quench' model) or that galaxies must evolve in a density-dependent manner (an 'in situ evolution' model).

Original languageEnglish
Article numberstt1489
Pages (from-to)2903-2917
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume435
Issue number4
DOIs
Publication statusPublished - Nov 2013

Keywords

  • galaxies: clusters: general
  • galaxies: elliptical and lenticular, cD
  • galaxies: evolution
  • galaxies: kinematics and dynamics

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