TY - JOUR
T1 - Galaxy and mass assembly
T2 - resolving the role of environment in galaxy evolution
AU - Brough, S.
AU - Croom, S.
AU - Sharp, R.
AU - Hopkins, A. M.
AU - Taylor, E. N.
AU - Baldry, I. K.
AU - Gunawardhana, M. L P
AU - Liske, J.
AU - Norberg, P.
AU - Robotham, A. S G
AU - Bauer, A. E.
AU - Bland-Hawthorn, J.
AU - Colless, M.
AU - Foster, C.
AU - Kelvin, L. S.
AU - Lara-Lopez, M. A.
AU - López-Sánchez, A. R.
AU - Loveday, J.
AU - Owers, M.
AU - Pimbblet, K. A.
AU - Prescott, M.
PY - 2013/11
Y1 - 2013/11
N2 - 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).
AB - 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).
KW - galaxies: clusters: general
KW - galaxies: elliptical and lenticular, cD
KW - galaxies: evolution
KW - galaxies: kinematics and dynamics
UR - http://www.scopus.com/inward/record.url?scp=84885788150&partnerID=8YFLogxK
U2 - 10.1093/mnras/stt1489
DO - 10.1093/mnras/stt1489
M3 - Article
AN - SCOPUS:84885788150
SN - 0035-8711
VL - 435
SP - 2903
EP - 2917
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
M1 - stt1489
ER -